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		<title><![CDATA[Golborne Vintage Radio - All Forums]]></title>
		<link>https://golbornevintageradio.co.uk/forum/</link>
		<description><![CDATA[Golborne Vintage Radio - https://golbornevintageradio.co.uk/forum]]></description>
		<pubDate>Sun, 30 Aug 2026 11:09:57 +0000</pubDate>
		<generator>MyBB</generator>
		<item>
			<title><![CDATA[Home Made Two-Valve AM Radio]]></title>
			<link>https://golbornevintageradio.co.uk/forum/showthread.php?tid=9687</link>
			<pubDate>Fri, 28 Aug 2026 13:57:42 +0000</pubDate>
			<dc:creator><![CDATA[<a href="https://golbornevintageradio.co.uk/forum/member.php?action=profile&uid=3848">Theodosea</a>]]></dc:creator>
			<guid isPermaLink="false">https://golbornevintageradio.co.uk/forum/showthread.php?tid=9687</guid>
			<description><![CDATA[As promised here is my two-valve home made radio,<br />
<br />
I am a regular Watcher of Michael Dranfield's TV repair channel on youtube and every December he picks a project from one of the old radio construction mags and builds something. In 2024 it was a TRF two-valve radio using 2 EF50's - this was featured in Practical Wireless August 1955<br />
So last summer I  thought I would have a go at building this radio. I managed to get all the components from Burnetts in Lincs - including the Wearite MW coil! the  chassis was a piece of aluminium bent up at my local engineering shop. The case was made from ply and I clad this with teak veneer.<br />
<br />
Down here in Southampton there are now only two stations on MW - both sports stations, and for this radio to work I have had to rig up a short vertical aerial and a copper earth rod just behind the garage. The volume is pretty decent for my garage/workshop and quite clear, there is no signal drift. All in all very pleased with this radio.<br />
<br />
Regards Nick<br /><!-- start: postbit_attachments_attachment -->
<br /><!-- start: attachment_icon -->
<img src="https://golbornevintageradio.co.uk/forum/images/attachtypes/image.png" title="JPG Image" border="0" alt=".jpg" />
<!-- end: attachment_icon -->&nbsp;&nbsp;<a href="attachment.php?aid=23162" target="_blank" title="">2-valve radio front view.jpg</a> (Size: 1.14 MB / Downloads: 19)
<!-- end: postbit_attachments_attachment --><br /><!-- start: postbit_attachments_attachment -->
<br /><!-- start: attachment_icon -->
<img src="https://golbornevintageradio.co.uk/forum/images/attachtypes/image.png" title="JPG Image" border="0" alt=".jpg" />
<!-- end: attachment_icon -->&nbsp;&nbsp;<a href="attachment.php?aid=23163" target="_blank" title="">2-valve radio rear view.jpg</a> (Size: 1.01 MB / Downloads: 19)
<!-- end: postbit_attachments_attachment -->]]></description>
			<content:encoded><![CDATA[As promised here is my two-valve home made radio,<br />
<br />
I am a regular Watcher of Michael Dranfield's TV repair channel on youtube and every December he picks a project from one of the old radio construction mags and builds something. In 2024 it was a TRF two-valve radio using 2 EF50's - this was featured in Practical Wireless August 1955<br />
So last summer I  thought I would have a go at building this radio. I managed to get all the components from Burnetts in Lincs - including the Wearite MW coil! the  chassis was a piece of aluminium bent up at my local engineering shop. The case was made from ply and I clad this with teak veneer.<br />
<br />
Down here in Southampton there are now only two stations on MW - both sports stations, and for this radio to work I have had to rig up a short vertical aerial and a copper earth rod just behind the garage. The volume is pretty decent for my garage/workshop and quite clear, there is no signal drift. All in all very pleased with this radio.<br />
<br />
Regards Nick<br /><!-- start: postbit_attachments_attachment -->
<br /><!-- start: attachment_icon -->
<img src="https://golbornevintageradio.co.uk/forum/images/attachtypes/image.png" title="JPG Image" border="0" alt=".jpg" />
<!-- end: attachment_icon -->&nbsp;&nbsp;<a href="attachment.php?aid=23162" target="_blank" title="">2-valve radio front view.jpg</a> (Size: 1.14 MB / Downloads: 19)
<!-- end: postbit_attachments_attachment --><br /><!-- start: postbit_attachments_attachment -->
<br /><!-- start: attachment_icon -->
<img src="https://golbornevintageradio.co.uk/forum/images/attachtypes/image.png" title="JPG Image" border="0" alt=".jpg" />
<!-- end: attachment_icon -->&nbsp;&nbsp;<a href="attachment.php?aid=23163" target="_blank" title="">2-valve radio rear view.jpg</a> (Size: 1.01 MB / Downloads: 19)
<!-- end: postbit_attachments_attachment -->]]></content:encoded>
		</item>
		<item>
			<title><![CDATA[Farnell SSG520 tale of repair]]></title>
			<link>https://golbornevintageradio.co.uk/forum/showthread.php?tid=9685</link>
			<pubDate>Wed, 26 Aug 2026 12:33:40 +0000</pubDate>
			<dc:creator><![CDATA[<a href="https://golbornevintageradio.co.uk/forum/member.php?action=profile&uid=3837">CaptainPugwash</a>]]></dc:creator>
			<guid isPermaLink="false">https://golbornevintageradio.co.uk/forum/showthread.php?tid=9685</guid>
			<description><![CDATA[Hi all,<br />
So, I bought one of these from E-Bay, sale or repair a few weeks ago. It's now up and running exactly as expected given its age and this is the story of how that happened.<br />
<br />
So, when I received it, it powered up but the output was no greater than 12uW and off frequency by anything between 27 and 200Mhz depending on the thumbwheels.<br />
<br />
Anyway, 1st things first as with all equipment of this age. The power supply. Changed nearly all of the electrolytic caps just for safety more than anything. A quick check and tweak and all supply voltages stable and more importantly, ripple free.<br />
<br />
Next, check over all the thumbwheels and all outputting the corresponding bcd code when called on. However, the lock light was always off and checking the tuning voltage from the output of the synthesiser, it sat at a constant 22V. Something amiss!<br />
<br />
Chased the logic through the synth and ended up replacing all the caps on that board along with the following ICs. 2,3,4,5 and 12. I also removed IC and fitted a socket for it for future repairability. Also cut the tuning voltage track and fitted a removable link. More on that later.<br />
<br />
Some success, now locking at 10, 11 12 and 13 Mhz. Nothing higher though. <br />
<br />
Onwards to the prescaler. Well, when I took the RF cover off, it looked like a one handed gorilla wearing a boxing glove had been let loose with a welder. In all my years repairing electronic equipment, I've never seen such poor soldering. I'm surprised that the thing didn't go bang when I powered it up, which teaches me at least to make a more thorough inspection before applying power in future to things bought a repair items <img src="https://golbornevintageradio.co.uk/forum/images/smilies/smile.png" alt="Smile" title="Smile" class="smilie smilie_401" /><br />
<br />
Anyway, I again changed all the caps, cleaned up the messy soldering and as per the synth, broke the hard wired link on the board and fitted a removable one.<br />
<br />
From there, I replaced all of the rotted co-axial cable that was being used to carry DC with new cable and discovered the output from IC 7 to be wondering around once above 13Mhz. It was also getting red hot. So, replaced both IC6 and 7 as they are used as dividers. Still not locking above 13Mhz, but running cooler with no residual noise. <br />
<br />
Had a further deep dive and found that transistor VT1, a bfr90 faulty. Replaced that and great news. Synth now locking across all frequencies. <br />
<br />
Now to align it. This is where experience counts as the manual isn't the best. You recall, I cut the tuning voltage track on the synth. This is why. I removed the link and fed the oscillators with an external power supply. Starting on the 10Mhz range, I set the oscillator tuning coil grub 3 1/2<br />
turns in from being level with the top of the coil. Don't ask me how I knew to do that. It's just years of experince working with early synthesisers.<br />
<br />
Anyhow, adjusted the external supply to get exactly 10 Mhz and noted voltage which is 2.52V. Then worked though the other oscillators with the supply at that voltage and tuned each coil to its corresponding lowest frequency, or as close as I could get it.<br />
<br />
Then repeated the whole exercise again, but this time starting at the maximum frequency for the 10-13.999Mhz range, and rinsing and repeating for the others. Went through this about a dozen times, making slight tweaks as I went along to ensure that everything flowed smoothly. Tuning range voltage between 2.7 and 17.9 approx.<br />
<br />
Once I was happy with the oscillators, replaced the link to the synth tuning output and checked to make sure synth locked across the entire range, which it does. So now I had to tackle the low power out.<br />
<br />
Anyway, that turned out to be a completely missing link between the amp/modulator board and the step attenuator. Fitted and now have up to 7dBm output across the entire frequency range, stable, clean, well on my spectrum analyser at least and remains so over long periods of time. Even from cold within 50 Hz.<br />
<br />
Next job then, check the AM and FM modulation. Well, a nice surprise. Nothing to do on the AM side except a quick alignment as per the service manual. Spot on, 1005Hz and 412Hz, which is close enough for me, with amplitude depth exactly tracking against my Marconi 2955 test set.<br />
<br />
FM. Zilch, nada, nought. Onto the FM correction board then. I noticed in the manual that it has a test point that when dropped to earth through a 1.5k resistor starts the latch, at which point I get FM. Not at the level expected, but it's a start. End up replacing IC21, 17. All caps and diodes D7,8,9 and 10. Fantastic. Now have FM. Aligned and mostly where its meant to be. The front panel power meter is a bit slow responding so I need to try and find a suitable replacement. But all in all, fingers crossed, a long term success story.<br />
<br />
Just wanted to share in case anyone else has one of these. I still have a little work to do on it. Mostly replaceing rotted cables. But that's now a nice easy 'Saturday potter' day when the Mr's has stopped finding me things to do.]]></description>
			<content:encoded><![CDATA[Hi all,<br />
So, I bought one of these from E-Bay, sale or repair a few weeks ago. It's now up and running exactly as expected given its age and this is the story of how that happened.<br />
<br />
So, when I received it, it powered up but the output was no greater than 12uW and off frequency by anything between 27 and 200Mhz depending on the thumbwheels.<br />
<br />
Anyway, 1st things first as with all equipment of this age. The power supply. Changed nearly all of the electrolytic caps just for safety more than anything. A quick check and tweak and all supply voltages stable and more importantly, ripple free.<br />
<br />
Next, check over all the thumbwheels and all outputting the corresponding bcd code when called on. However, the lock light was always off and checking the tuning voltage from the output of the synthesiser, it sat at a constant 22V. Something amiss!<br />
<br />
Chased the logic through the synth and ended up replacing all the caps on that board along with the following ICs. 2,3,4,5 and 12. I also removed IC and fitted a socket for it for future repairability. Also cut the tuning voltage track and fitted a removable link. More on that later.<br />
<br />
Some success, now locking at 10, 11 12 and 13 Mhz. Nothing higher though. <br />
<br />
Onwards to the prescaler. Well, when I took the RF cover off, it looked like a one handed gorilla wearing a boxing glove had been let loose with a welder. In all my years repairing electronic equipment, I've never seen such poor soldering. I'm surprised that the thing didn't go bang when I powered it up, which teaches me at least to make a more thorough inspection before applying power in future to things bought a repair items <img src="https://golbornevintageradio.co.uk/forum/images/smilies/smile.png" alt="Smile" title="Smile" class="smilie smilie_401" /><br />
<br />
Anyway, I again changed all the caps, cleaned up the messy soldering and as per the synth, broke the hard wired link on the board and fitted a removable one.<br />
<br />
From there, I replaced all of the rotted co-axial cable that was being used to carry DC with new cable and discovered the output from IC 7 to be wondering around once above 13Mhz. It was also getting red hot. So, replaced both IC6 and 7 as they are used as dividers. Still not locking above 13Mhz, but running cooler with no residual noise. <br />
<br />
Had a further deep dive and found that transistor VT1, a bfr90 faulty. Replaced that and great news. Synth now locking across all frequencies. <br />
<br />
Now to align it. This is where experience counts as the manual isn't the best. You recall, I cut the tuning voltage track on the synth. This is why. I removed the link and fed the oscillators with an external power supply. Starting on the 10Mhz range, I set the oscillator tuning coil grub 3 1/2<br />
turns in from being level with the top of the coil. Don't ask me how I knew to do that. It's just years of experince working with early synthesisers.<br />
<br />
Anyhow, adjusted the external supply to get exactly 10 Mhz and noted voltage which is 2.52V. Then worked though the other oscillators with the supply at that voltage and tuned each coil to its corresponding lowest frequency, or as close as I could get it.<br />
<br />
Then repeated the whole exercise again, but this time starting at the maximum frequency for the 10-13.999Mhz range, and rinsing and repeating for the others. Went through this about a dozen times, making slight tweaks as I went along to ensure that everything flowed smoothly. Tuning range voltage between 2.7 and 17.9 approx.<br />
<br />
Once I was happy with the oscillators, replaced the link to the synth tuning output and checked to make sure synth locked across the entire range, which it does. So now I had to tackle the low power out.<br />
<br />
Anyway, that turned out to be a completely missing link between the amp/modulator board and the step attenuator. Fitted and now have up to 7dBm output across the entire frequency range, stable, clean, well on my spectrum analyser at least and remains so over long periods of time. Even from cold within 50 Hz.<br />
<br />
Next job then, check the AM and FM modulation. Well, a nice surprise. Nothing to do on the AM side except a quick alignment as per the service manual. Spot on, 1005Hz and 412Hz, which is close enough for me, with amplitude depth exactly tracking against my Marconi 2955 test set.<br />
<br />
FM. Zilch, nada, nought. Onto the FM correction board then. I noticed in the manual that it has a test point that when dropped to earth through a 1.5k resistor starts the latch, at which point I get FM. Not at the level expected, but it's a start. End up replacing IC21, 17. All caps and diodes D7,8,9 and 10. Fantastic. Now have FM. Aligned and mostly where its meant to be. The front panel power meter is a bit slow responding so I need to try and find a suitable replacement. But all in all, fingers crossed, a long term success story.<br />
<br />
Just wanted to share in case anyone else has one of these. I still have a little work to do on it. Mostly replaceing rotted cables. But that's now a nice easy 'Saturday potter' day when the Mr's has stopped finding me things to do.]]></content:encoded>
		</item>
		<item>
			<title><![CDATA[Home Made bench test equipment]]></title>
			<link>https://golbornevintageradio.co.uk/forum/showthread.php?tid=9684</link>
			<pubDate>Wed, 26 Aug 2026 09:23:12 +0000</pubDate>
			<dc:creator><![CDATA[<a href="https://golbornevintageradio.co.uk/forum/member.php?action=profile&uid=3848">Theodosea</a>]]></dc:creator>
			<guid isPermaLink="false">https://golbornevintageradio.co.uk/forum/showthread.php?tid=9684</guid>
			<description><![CDATA[I thought members would be interested in some bench test equipment I made up last year,<br />
<br />
I picked up a bare 6Amp variac at a radio rally and made up this enclosure  - the steel cabinets are from TLC Electrical wholesalers and are around £30 - well made and perfect for these types of project.<br />
<br />
The isolation transformer - using 1:1 toroidal transformer, for powering up unknown repair items safely, when I first built this I had a few problems with the transformer tripping my consumer unit - these toroidal transformers do create quite a surge on start up so I fitted a BC socket inside the enclosure with a 40watt incandescent lamp which I can switch in series with the mains incoming for first switch on, it absorbs the surge, I then  throw the switch and this shorts out the lamp ready for use. (it works well as long as I remember to set the switch!)<br />
<br />
Also built a current absorption device - lightbulb! this is useful for test items that may be short-circuited.<br />
<br />
I recently acquired an AVO RF135 Audio/radio frequency signal generator for a recent FM Radio repair and set up, but prob wont ever use it again as I have a Gould AF sig gen for general use. this is available for sale if someone can make use of it.]]></description>
			<content:encoded><![CDATA[I thought members would be interested in some bench test equipment I made up last year,<br />
<br />
I picked up a bare 6Amp variac at a radio rally and made up this enclosure  - the steel cabinets are from TLC Electrical wholesalers and are around £30 - well made and perfect for these types of project.<br />
<br />
The isolation transformer - using 1:1 toroidal transformer, for powering up unknown repair items safely, when I first built this I had a few problems with the transformer tripping my consumer unit - these toroidal transformers do create quite a surge on start up so I fitted a BC socket inside the enclosure with a 40watt incandescent lamp which I can switch in series with the mains incoming for first switch on, it absorbs the surge, I then  throw the switch and this shorts out the lamp ready for use. (it works well as long as I remember to set the switch!)<br />
<br />
Also built a current absorption device - lightbulb! this is useful for test items that may be short-circuited.<br />
<br />
I recently acquired an AVO RF135 Audio/radio frequency signal generator for a recent FM Radio repair and set up, but prob wont ever use it again as I have a Gould AF sig gen for general use. this is available for sale if someone can make use of it.]]></content:encoded>
		</item>
		<item>
			<title><![CDATA[New Member]]></title>
			<link>https://golbornevintageradio.co.uk/forum/showthread.php?tid=9683</link>
			<pubDate>Sat, 22 Aug 2026 18:02:25 +0000</pubDate>
			<dc:creator><![CDATA[<a href="https://golbornevintageradio.co.uk/forum/member.php?action=profile&uid=3848">Theodosea</a>]]></dc:creator>
			<guid isPermaLink="false">https://golbornevintageradio.co.uk/forum/showthread.php?tid=9683</guid>
			<description><![CDATA[Hello everyone,<br />
Just joined the group today,<br />
I am currently restoring/repairing an old analogue oscilloscope,<br />
<br />
Regards nick <img src="https://golbornevintageradio.co.uk/forum/images/smilies/smile.png" alt="Smile" title="Smile" class="smilie smilie_401" />]]></description>
			<content:encoded><![CDATA[Hello everyone,<br />
Just joined the group today,<br />
I am currently restoring/repairing an old analogue oscilloscope,<br />
<br />
Regards nick <img src="https://golbornevintageradio.co.uk/forum/images/smilies/smile.png" alt="Smile" title="Smile" class="smilie smilie_401" />]]></content:encoded>
		</item>
		<item>
			<title><![CDATA[Hacker Sovereign 3]]></title>
			<link>https://golbornevintageradio.co.uk/forum/showthread.php?tid=9681</link>
			<pubDate>Tue, 18 Aug 2026 20:27:17 +0000</pubDate>
			<dc:creator><![CDATA[<a href="https://golbornevintageradio.co.uk/forum/member.php?action=profile&uid=3844">GrahamCo</a>]]></dc:creator>
			<guid isPermaLink="false">https://golbornevintageradio.co.uk/forum/showthread.php?tid=9681</guid>
			<description><![CDATA[A friend asked me to look at his Hacker Sovereign 3 and see if I could get it working (as they do). Completely dead so my immediate thought was the mains power unit. Too easy; power getting to the boards, so the hunt continues. I don't seem to be able to find the schematic anywhere on line. Can anyone post a link to a pdf please?<br />
Thanks.]]></description>
			<content:encoded><![CDATA[A friend asked me to look at his Hacker Sovereign 3 and see if I could get it working (as they do). Completely dead so my immediate thought was the mains power unit. Too easy; power getting to the boards, so the hunt continues. I don't seem to be able to find the schematic anywhere on line. Can anyone post a link to a pdf please?<br />
Thanks.]]></content:encoded>
		</item>
		<item>
			<title><![CDATA[Biggleswade BVWS Meet - September 13th]]></title>
			<link>https://golbornevintageradio.co.uk/forum/showthread.php?tid=9679</link>
			<pubDate>Sun, 09 Aug 2026 14:24:18 +0000</pubDate>
			<dc:creator><![CDATA[<a href="https://golbornevintageradio.co.uk/forum/member.php?action=profile&uid=1029">pamphonica</a>]]></dc:creator>
			<guid isPermaLink="false">https://golbornevintageradio.co.uk/forum/showthread.php?tid=9679</guid>
			<description><![CDATA[<span style="font-weight: bold;" class="mycode_b">The Autumn BVWS Biggleswade Meet will run on Sunday September 13th 2026.</span><br />
<br />
Doors open at 0930. There will be a large BVWS sales stall, the usual Dulwich Museum Bring & Buy, and lots of other fascinating stalls selling everything you can imagine. Bargains galore. Hot and cold refreshments are available all day. Do come if you can. All welcome.<br />
<br />
Some event details will appear in the Autumn BVWS Bulletin, and are also available via the events pages on the BVWS website: <a href="http://www.bvws.org.uk" target="_blank" rel="noopener" class="mycode_url">www.bvws.org.uk</a>.<br />
<br />
The Weatherley Centre (SG18 8JH) has some off-street parking right by the hall, and free on-street parking very close by. It is located only a mile from either of the two Biggleswade exit roundabouts on the A1. Train services are excellent (under an hour from London), and the station is a 12 minute walk from the hall.<br />
<br />
<span style="color: #E82A1F;" class="mycode_color"><span style="font-weight: bold;" class="mycode_b">VERY IMPORTANT - PARKING.</span></span><br />
<br />
Weatherley Centre have introduced an ANPR (automated number plate recognition) system for the parking by the hall, to deter casual parking. Everyone visiting the BVWS event is still entitled to free parking (if available) in the hall car park.<br />
<br />
If you park in the Hall carpark you must register your car number plate at the front desk as you arrive, using a QR code. (also available in the hall). For non smartphone users there will be a tablet available. Parking on the road is also still free (no ANPR). You are advised not to park elsewhere on the school site as you may be booked.<br />
<br />
Full details are at the end of this page of Weatherley information:<br />
<a href="https://www.theweatherleycentre.co.uk/frequently-asked-questions" target="_blank" rel="noopener" class="mycode_url">https://www.theweatherleycentre.co.uk/fr...-questions</a><br />
<br />
If you have to park on the road you are welcome to drive up to the hall at the end to collect purchases. You do not need to register if you are there less than 15 minutes. If you need longer, please remember to register inside.<br />
<br />
<span style="font-weight: bold;" class="mycode_b">STALLS:</span> (currently nearly sold out)<br />
<br />
If you want to book a stall, please contact me directly. My email is at the bottom of page 3 of the latest Bulletin, or PM me here.<br />
<br />
I hope to see lots of you at "Biggles" in September!<br />
<br />
all the best<br />
<br />
-Jeremy]]></description>
			<content:encoded><![CDATA[<span style="font-weight: bold;" class="mycode_b">The Autumn BVWS Biggleswade Meet will run on Sunday September 13th 2026.</span><br />
<br />
Doors open at 0930. There will be a large BVWS sales stall, the usual Dulwich Museum Bring & Buy, and lots of other fascinating stalls selling everything you can imagine. Bargains galore. Hot and cold refreshments are available all day. Do come if you can. All welcome.<br />
<br />
Some event details will appear in the Autumn BVWS Bulletin, and are also available via the events pages on the BVWS website: <a href="http://www.bvws.org.uk" target="_blank" rel="noopener" class="mycode_url">www.bvws.org.uk</a>.<br />
<br />
The Weatherley Centre (SG18 8JH) has some off-street parking right by the hall, and free on-street parking very close by. It is located only a mile from either of the two Biggleswade exit roundabouts on the A1. Train services are excellent (under an hour from London), and the station is a 12 minute walk from the hall.<br />
<br />
<span style="color: #E82A1F;" class="mycode_color"><span style="font-weight: bold;" class="mycode_b">VERY IMPORTANT - PARKING.</span></span><br />
<br />
Weatherley Centre have introduced an ANPR (automated number plate recognition) system for the parking by the hall, to deter casual parking. Everyone visiting the BVWS event is still entitled to free parking (if available) in the hall car park.<br />
<br />
If you park in the Hall carpark you must register your car number plate at the front desk as you arrive, using a QR code. (also available in the hall). For non smartphone users there will be a tablet available. Parking on the road is also still free (no ANPR). You are advised not to park elsewhere on the school site as you may be booked.<br />
<br />
Full details are at the end of this page of Weatherley information:<br />
<a href="https://www.theweatherleycentre.co.uk/frequently-asked-questions" target="_blank" rel="noopener" class="mycode_url">https://www.theweatherleycentre.co.uk/fr...-questions</a><br />
<br />
If you have to park on the road you are welcome to drive up to the hall at the end to collect purchases. You do not need to register if you are there less than 15 minutes. If you need longer, please remember to register inside.<br />
<br />
<span style="font-weight: bold;" class="mycode_b">STALLS:</span> (currently nearly sold out)<br />
<br />
If you want to book a stall, please contact me directly. My email is at the bottom of page 3 of the latest Bulletin, or PM me here.<br />
<br />
I hope to see lots of you at "Biggles" in September!<br />
<br />
all the best<br />
<br />
-Jeremy]]></content:encoded>
		</item>
		<item>
			<title><![CDATA[Hello from the West Mids]]></title>
			<link>https://golbornevintageradio.co.uk/forum/showthread.php?tid=9678</link>
			<pubDate>Thu, 30 Jul 2026 18:52:36 +0000</pubDate>
			<dc:creator><![CDATA[<a href="https://golbornevintageradio.co.uk/forum/member.php?action=profile&uid=3837">CaptainPugwash</a>]]></dc:creator>
			<guid isPermaLink="false">https://golbornevintageradio.co.uk/forum/showthread.php?tid=9678</guid>
			<description><![CDATA[Hi all,<br />
<br />
Newbie here. Ex Royal Sigs RR tech from way back and most of my working life afterwards spent in and around 2 way radio, cellular (analogue and digital) and now finally retired. <br />
Built myself a man cave at home as a get away and to save sitting in front of TV and am repairing various pieces of kit I own with varying degrees of success. <br />
A Marconi 2955R which is mostly now complete, but I need another sig gen to complete calibration of the sensitive RX. A couple of old Hameg scopes. One which is beyond rescue but the other works fine. Could no doubt do with some caps changing and I'll get to it one day. A couple of spectrum analysers which are OK except for batteries. Not worried about that. And the sig gen I bought as a spares or repair from a well known auction site which is turning out to be more challenging than the 2955 has been. I need to get it going though to complete repairs as previously mentioned.<br />
Anyway, that's me in a nutshell. Sorry it's so long.<br />
<br />
Best rgds<br />
<br />
Vic]]></description>
			<content:encoded><![CDATA[Hi all,<br />
<br />
Newbie here. Ex Royal Sigs RR tech from way back and most of my working life afterwards spent in and around 2 way radio, cellular (analogue and digital) and now finally retired. <br />
Built myself a man cave at home as a get away and to save sitting in front of TV and am repairing various pieces of kit I own with varying degrees of success. <br />
A Marconi 2955R which is mostly now complete, but I need another sig gen to complete calibration of the sensitive RX. A couple of old Hameg scopes. One which is beyond rescue but the other works fine. Could no doubt do with some caps changing and I'll get to it one day. A couple of spectrum analysers which are OK except for batteries. Not worried about that. And the sig gen I bought as a spares or repair from a well known auction site which is turning out to be more challenging than the 2955 has been. I need to get it going though to complete repairs as previously mentioned.<br />
Anyway, that's me in a nutshell. Sorry it's so long.<br />
<br />
Best rgds<br />
<br />
Vic]]></content:encoded>
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			<title><![CDATA[Cow and TV Graphics]]></title>
			<link>https://golbornevintageradio.co.uk/forum/showthread.php?tid=9677</link>
			<pubDate>Fri, 24 Jul 2026 08:18:57 +0000</pubDate>
			<dc:creator><![CDATA[<a href="https://golbornevintageradio.co.uk/forum/member.php?action=profile&uid=1373">Mike Watterson</a>]]></dc:creator>
			<guid isPermaLink="false">https://golbornevintageradio.co.uk/forum/showthread.php?tid=9677</guid>
			<description><![CDATA[This is <a href="https://www.kecskebak.hu/?p=64" target="_blank" rel="noopener" class="mycode_url">several topics</a><br />
Here is a<a href="https://www.kecskebak.hu/?p=552" target="_blank" rel="noopener" class="mycode_url"> Cow recreation</a>]]></description>
			<content:encoded><![CDATA[This is <a href="https://www.kecskebak.hu/?p=64" target="_blank" rel="noopener" class="mycode_url">several topics</a><br />
Here is a<a href="https://www.kecskebak.hu/?p=552" target="_blank" rel="noopener" class="mycode_url"> Cow recreation</a>]]></content:encoded>
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			<title><![CDATA[BVWS swapmeet at the Broadcast Engineering Museum]]></title>
			<link>https://golbornevintageradio.co.uk/forum/showthread.php?tid=9674</link>
			<pubDate>Tue, 14 Jul 2026 19:41:55 +0000</pubDate>
			<dc:creator><![CDATA[<a href="https://golbornevintageradio.co.uk/forum/member.php?action=profile&uid=66">ppppenguin</a>]]></dc:creator>
			<guid isPermaLink="false">https://golbornevintageradio.co.uk/forum/showthread.php?tid=9674</guid>
			<description><![CDATA[We look forward to seeing you at the brand new BVWS swapmeet hosted by the Broadcast Engineering Museum, a few miles north of Lincoln. Your £8 fee (reductions for children) admits you to both the museum and the swapmeet. General entry at 11am.<br />
<br />
Come aboard our fully working Southern outside broadcast, shown here outside the museum. It’s one of many exhibits that will be on display.<br />
<br />
If you would like to book a stall, a few are still available. It’s £18 for one table with one person. Details here: <a href="https://becg.org.uk/2026/03/24/bvws-swapmeet-2nd-august-2026/" target="_blank" rel="noopener" class="mycode_url">https://becg.org.uk/2026/03/24/bvws-swap...gust-2026/</a><br />
<br />
Directions to the museum: <a href="https://becg.org.uk/finding-us/" target="_blank" rel="noopener" class="mycode_url">https://becg.org.uk/finding-us/</a><br /><!-- start: postbit_attachments_attachment -->
<br /><!-- start: attachment_icon -->
<img src="https://golbornevintageradio.co.uk/forum/images/attachtypes/pdf.png" title="Adobe Acrobat PDF" border="0" alt=".pdf" />
<!-- end: attachment_icon -->&nbsp;&nbsp;<a href="attachment.php?aid=23140" target="_blank" title="">bvws_meeting_booking.pdf</a> (Size: 74.11 KB / Downloads: 1)
<!-- end: postbit_attachments_attachment --><br /><!-- start: postbit_attachments_attachment -->
<br /><!-- start: attachment_icon -->
<img src="https://golbornevintageradio.co.uk/forum/images/attachtypes/image.png" title="JPG Image" border="0" alt=".jpg" />
<!-- end: attachment_icon -->&nbsp;&nbsp;<a href="attachment.php?aid=23141" target="_blank" title="">zzz.jpg</a> (Size: 567.57 KB / Downloads: 9)
<!-- end: postbit_attachments_attachment -->]]></description>
			<content:encoded><![CDATA[We look forward to seeing you at the brand new BVWS swapmeet hosted by the Broadcast Engineering Museum, a few miles north of Lincoln. Your £8 fee (reductions for children) admits you to both the museum and the swapmeet. General entry at 11am.<br />
<br />
Come aboard our fully working Southern outside broadcast, shown here outside the museum. It’s one of many exhibits that will be on display.<br />
<br />
If you would like to book a stall, a few are still available. It’s £18 for one table with one person. Details here: <a href="https://becg.org.uk/2026/03/24/bvws-swapmeet-2nd-august-2026/" target="_blank" rel="noopener" class="mycode_url">https://becg.org.uk/2026/03/24/bvws-swap...gust-2026/</a><br />
<br />
Directions to the museum: <a href="https://becg.org.uk/finding-us/" target="_blank" rel="noopener" class="mycode_url">https://becg.org.uk/finding-us/</a><br /><!-- start: postbit_attachments_attachment -->
<br /><!-- start: attachment_icon -->
<img src="https://golbornevintageradio.co.uk/forum/images/attachtypes/pdf.png" title="Adobe Acrobat PDF" border="0" alt=".pdf" />
<!-- end: attachment_icon -->&nbsp;&nbsp;<a href="attachment.php?aid=23140" target="_blank" title="">bvws_meeting_booking.pdf</a> (Size: 74.11 KB / Downloads: 1)
<!-- end: postbit_attachments_attachment --><br /><!-- start: postbit_attachments_attachment -->
<br /><!-- start: attachment_icon -->
<img src="https://golbornevintageradio.co.uk/forum/images/attachtypes/image.png" title="JPG Image" border="0" alt=".jpg" />
<!-- end: attachment_icon -->&nbsp;&nbsp;<a href="attachment.php?aid=23141" target="_blank" title="">zzz.jpg</a> (Size: 567.57 KB / Downloads: 9)
<!-- end: postbit_attachments_attachment -->]]></content:encoded>
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			<title><![CDATA[Promax Prolink-2 info needed.]]></title>
			<link>https://golbornevintageradio.co.uk/forum/showthread.php?tid=9672</link>
			<pubDate>Mon, 06 Jul 2026 21:13:17 +0000</pubDate>
			<dc:creator><![CDATA[<a href="https://golbornevintageradio.co.uk/forum/member.php?action=profile&uid=1373">Mike Watterson</a>]]></dc:creator>
			<guid isPermaLink="false">https://golbornevintageradio.co.uk/forum/showthread.php?tid=9672</guid>
			<description><![CDATA[I did find a sales brochure for the Prolink-2 and a manual (on a USA test gear rental site) for the Prolink-2 prem / Premium.<br />
<br />
The Prolink-2 is obviously vintage as it uses a mono CRT and 2 x 6V Lead acid packs in parallel!<br />
<br />
Prolink-2 Premium has a knob instead of up/down, colour LCD and Lithium Ion battery, but otherwise seems similar.<br />
<br />
It seems to do most Analogue TV modes and also Mpeg-2 Digital. It does work as an FM radio!<br />
All TV here is DVB-T, not DVB-T2, but all is Mpeg4, not 2, even for SD.<br />
Oddly has a BNC. It can send Diseq and power LNBs or masthead amps (up to 24V). Curiously I have BNC to Belling lee and F-Connector. <br />
<br />
However I bought it as a cheap 45-862 and 900-2100 MHz spectrum analyser. Which seems to sort of work.<br />
<br />
I found that 5 x NiMH wasn't enough and it seems OK with 6 x C size 4 Ah NiMH instead of the 2x 3Ah Lead acid in parallel (marked Peak 7.5V).<br />
<br />
It wouldn't run off the bench PSU (3A) set to 12V without a 6000uF cap. A surge just after boot. Takes just under 3A.<br />
<br />
I have a 14V 4A PSU which measures 14.3 open circuit or on 1A load. Not too much if it's designed for vehicle charging / power, but the brochure and the later Prolink-2 Premium manual don't have a spec with voltage limits.<br />
<br />
It's a cute mono CRT!<br />
<br />
<span style="font-weight: bold;" class="mycode_b">So questions </span><br />
1. Anyone got the proper user manual? The Promax Eng & Spa sites have the Prolink-1 and Prolink-3 and later, but neither of the Prolink-2 models.<br />
<br />
2. Anyone know the max external voltage?  Or a sane way to drop 2V.<br />
<br />
3. There is unpopulated PCB with ID numbers for parts. What might that be for?<br />
<br />
4. It's got a SCART! Is that for just output or input or both? The Prolink-2 Premium manual lists the signals.<br />
<br />
5. Could the CRT heater be running straight off the battery? 7.5V of original when fully charged couldn't be good?<br />
<br />
6. Actual schematic etc :D]]></description>
			<content:encoded><![CDATA[I did find a sales brochure for the Prolink-2 and a manual (on a USA test gear rental site) for the Prolink-2 prem / Premium.<br />
<br />
The Prolink-2 is obviously vintage as it uses a mono CRT and 2 x 6V Lead acid packs in parallel!<br />
<br />
Prolink-2 Premium has a knob instead of up/down, colour LCD and Lithium Ion battery, but otherwise seems similar.<br />
<br />
It seems to do most Analogue TV modes and also Mpeg-2 Digital. It does work as an FM radio!<br />
All TV here is DVB-T, not DVB-T2, but all is Mpeg4, not 2, even for SD.<br />
Oddly has a BNC. It can send Diseq and power LNBs or masthead amps (up to 24V). Curiously I have BNC to Belling lee and F-Connector. <br />
<br />
However I bought it as a cheap 45-862 and 900-2100 MHz spectrum analyser. Which seems to sort of work.<br />
<br />
I found that 5 x NiMH wasn't enough and it seems OK with 6 x C size 4 Ah NiMH instead of the 2x 3Ah Lead acid in parallel (marked Peak 7.5V).<br />
<br />
It wouldn't run off the bench PSU (3A) set to 12V without a 6000uF cap. A surge just after boot. Takes just under 3A.<br />
<br />
I have a 14V 4A PSU which measures 14.3 open circuit or on 1A load. Not too much if it's designed for vehicle charging / power, but the brochure and the later Prolink-2 Premium manual don't have a spec with voltage limits.<br />
<br />
It's a cute mono CRT!<br />
<br />
<span style="font-weight: bold;" class="mycode_b">So questions </span><br />
1. Anyone got the proper user manual? The Promax Eng & Spa sites have the Prolink-1 and Prolink-3 and later, but neither of the Prolink-2 models.<br />
<br />
2. Anyone know the max external voltage?  Or a sane way to drop 2V.<br />
<br />
3. There is unpopulated PCB with ID numbers for parts. What might that be for?<br />
<br />
4. It's got a SCART! Is that for just output or input or both? The Prolink-2 Premium manual lists the signals.<br />
<br />
5. Could the CRT heater be running straight off the battery? 7.5V of original when fully charged couldn't be good?<br />
<br />
6. Actual schematic etc :D]]></content:encoded>
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			<title><![CDATA[PM3267 oscilloscope]]></title>
			<link>https://golbornevintageradio.co.uk/forum/showthread.php?tid=9671</link>
			<pubDate>Mon, 06 Jul 2026 11:15:13 +0000</pubDate>
			<dc:creator><![CDATA[<a href="https://golbornevintageradio.co.uk/forum/member.php?action=profile&uid=66">ppppenguin</a>]]></dc:creator>
			<guid isPermaLink="false">https://golbornevintageradio.co.uk/forum/showthread.php?tid=9671</guid>
			<description><![CDATA[At the Broadcast Engineering Museum we've been given a Phlips PM3267 'scope. Looks like a decent and useful 100MHz instrument. I'm a Tektronix man and have little experience of Philips but have heard that they are good.<br />
<br />
A colleague switched it on. Panel lights appeared followed by magic smoke and the swear word "Rifas". Manuals readily available online. PSU circuit attached. It's Philips' own design of switchmode. I have little experience of this kind of PSU so any pointers before I get out the isolating transformer and start probing?<br />
<br />
I also brought home a Tek 2465 which probably needs a hybrid and a Tek 1751A waveform and vector monitor which has an obscure fault. Hours of fun.<br /><!-- start: postbit_attachments_attachment -->
<br /><!-- start: attachment_icon -->
<img src="https://golbornevintageradio.co.uk/forum/images/attachtypes/pdf.png" title="Adobe Acrobat PDF" border="0" alt=".pdf" />
<!-- end: attachment_icon -->&nbsp;&nbsp;<a href="attachment.php?aid=23135" target="_blank" title="">p156.pdf</a> (Size: 138.53 KB / Downloads: 4)
<!-- end: postbit_attachments_attachment -->]]></description>
			<content:encoded><![CDATA[At the Broadcast Engineering Museum we've been given a Phlips PM3267 'scope. Looks like a decent and useful 100MHz instrument. I'm a Tektronix man and have little experience of Philips but have heard that they are good.<br />
<br />
A colleague switched it on. Panel lights appeared followed by magic smoke and the swear word "Rifas". Manuals readily available online. PSU circuit attached. It's Philips' own design of switchmode. I have little experience of this kind of PSU so any pointers before I get out the isolating transformer and start probing?<br />
<br />
I also brought home a Tek 2465 which probably needs a hybrid and a Tek 1751A waveform and vector monitor which has an obscure fault. Hours of fun.<br /><!-- start: postbit_attachments_attachment -->
<br /><!-- start: attachment_icon -->
<img src="https://golbornevintageradio.co.uk/forum/images/attachtypes/pdf.png" title="Adobe Acrobat PDF" border="0" alt=".pdf" />
<!-- end: attachment_icon -->&nbsp;&nbsp;<a href="attachment.php?aid=23135" target="_blank" title="">p156.pdf</a> (Size: 138.53 KB / Downloads: 4)
<!-- end: postbit_attachments_attachment -->]]></content:encoded>
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			<title><![CDATA[Sig Gen out?]]></title>
			<link>https://golbornevintageradio.co.uk/forum/showthread.php?tid=9670</link>
			<pubDate>Sun, 05 Jul 2026 12:11:44 +0000</pubDate>
			<dc:creator><![CDATA[<a href="https://golbornevintageradio.co.uk/forum/member.php?action=profile&uid=890">boater sam</a>]]></dc:creator>
			<guid isPermaLink="false">https://golbornevintageradio.co.uk/forum/showthread.php?tid=9670</guid>
			<description><![CDATA[My ancient Grundig AS4B signal generator appears to have gone out of calibration and I have not got another to check it against.<br />
<br />
Is there a way to check the calibration using a radio or anything else simple?<br />
<br />
Sam.]]></description>
			<content:encoded><![CDATA[My ancient Grundig AS4B signal generator appears to have gone out of calibration and I have not got another to check it against.<br />
<br />
Is there a way to check the calibration using a radio or anything else simple?<br />
<br />
Sam.]]></content:encoded>
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		<item>
			<title><![CDATA[A 548]]></title>
			<link>https://golbornevintageradio.co.uk/forum/showthread.php?tid=9669</link>
			<pubDate>Thu, 02 Jul 2026 21:16:29 +0000</pubDate>
			<dc:creator><![CDATA[<a href="https://golbornevintageradio.co.uk/forum/member.php?action=profile&uid=890">boater sam</a>]]></dc:creator>
			<guid isPermaLink="false">https://golbornevintageradio.co.uk/forum/showthread.php?tid=9669</guid>
			<description><![CDATA[I think its an A 548.Supposed to have an EL3 output valve but its got an octal socket.<br />
<br />
Sam]]></description>
			<content:encoded><![CDATA[I think its an A 548.Supposed to have an EL3 output valve but its got an octal socket.<br />
<br />
Sam]]></content:encoded>
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			<title><![CDATA[Portadyne]]></title>
			<link>https://golbornevintageradio.co.uk/forum/showthread.php?tid=9668</link>
			<pubDate>Thu, 02 Jul 2026 18:47:29 +0000</pubDate>
			<dc:creator><![CDATA[<a href="https://golbornevintageradio.co.uk/forum/member.php?action=profile&uid=890">boater sam</a>]]></dc:creator>
			<guid isPermaLink="false">https://golbornevintageradio.co.uk/forum/showthread.php?tid=9668</guid>
			<description><![CDATA[I have acquired a Portadyne 548 radio. The rectifier and output valves are missing.<br />
Is there any service information available for this set?<br />
<br />
Sam.]]></description>
			<content:encoded><![CDATA[I have acquired a Portadyne 548 radio. The rectifier and output valves are missing.<br />
Is there any service information available for this set?<br />
<br />
Sam.]]></content:encoded>
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		<item>
			<title><![CDATA[Benson 8103 8 track/cartridge player]]></title>
			<link>https://golbornevintageradio.co.uk/forum/showthread.php?tid=9667</link>
			<pubDate>Wed, 01 Jul 2026 18:23:08 +0000</pubDate>
			<dc:creator><![CDATA[<a href="https://golbornevintageradio.co.uk/forum/member.php?action=profile&uid=1721">Danndad</a>]]></dc:creator>
			<guid isPermaLink="false">https://golbornevintageradio.co.uk/forum/showthread.php?tid=9667</guid>
			<description><![CDATA[Can anyone assist with some service info for a Japanese made Benson 8103 8track/ cartridge player please.<br />
<br />
Dandad.]]></description>
			<content:encoded><![CDATA[Can anyone assist with some service info for a Japanese made Benson 8103 8track/ cartridge player please.<br />
<br />
Dandad.]]></content:encoded>
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