https://golbornevintageradio.co.uk/forum/ Mon, 20 Apr 2026 03:17:17 +0000 MyBB https://golbornevintageradio.co.uk/forum/showthread.php?tid=9621 Sat, 28 Mar 2026 15:22:19 +0000 Thorpey]]> https://golbornevintageradio.co.uk/forum/showthread.php?tid=9621 Anyone got any pointers or experience with the unit.
Will probably hook it up and see where we go with a little RF and gradually increase it, I believe they are 100w but have no paperwork.]]> Anyone got any pointers or experience with the unit.
Will probably hook it up and see where we go with a little RF and gradually increase it, I believe they are 100w but have no paperwork.]]> https://golbornevintageradio.co.uk/forum/showthread.php?tid=9579 Fri, 13 Feb 2026 21:35:55 +0000 Oemspace]]> https://golbornevintageradio.co.uk/forum/showthread.php?tid=9579
Thanks 

?]]>
Thanks 

?]]> https://golbornevintageradio.co.uk/forum/showthread.php?tid=9563 Wed, 28 Jan 2026 11:35:15 +0000 Nigel.]]> https://golbornevintageradio.co.uk/forum/showthread.php?tid=9563 Hi I'm trying to download the service manual for the Pye SG5U I'm trying to repair this sig gen  with no RF output.  I have tried to download the pdf files on this site but with no luck ( say's access denied) if anyone could help 
Regards Nigel G0TUP ]]> Hi I'm trying to download the service manual for the Pye SG5U I'm trying to repair this sig gen  with no RF output.  I have tried to download the pdf files on this site but with no luck ( say's access denied) if anyone could help 
Regards Nigel G0TUP ]]> https://golbornevintageradio.co.uk/forum/showthread.php?tid=9490 Tue, 26 Aug 2025 17:05:54 +0000 DrStrangelove]]> https://golbornevintageradio.co.uk/forum/showthread.php?tid=9490
I've had a TM8 for many years.

Turned it on today: dead as a dodo.

Changed the fuse & powered up via The Big Green Light Box (fortunately).

It's a royal pain to dismantle and eventually once in bits turned out to be a shorted 1000uF reservoir capacitor.

Worked ok in bits.

Reassembled with difficulty and lo! suddenly it's very odd.

And then the Big Green Light Box lit up in approved fashion.

No idea what's wrong with the TM8 now, but I'd wager the mains transformer is shorted.

There's a HP3586C that would do the job I was attempting, but there's even less chance of that working than of fixing the TM8.

Also the 3586 is too big & heavy to shift.

Ho hum.]]>
I've had a TM8 for many years.

Turned it on today: dead as a dodo.

Changed the fuse & powered up via The Big Green Light Box (fortunately).

It's a royal pain to dismantle and eventually once in bits turned out to be a shorted 1000uF reservoir capacitor.

Worked ok in bits.

Reassembled with difficulty and lo! suddenly it's very odd.

And then the Big Green Light Box lit up in approved fashion.

No idea what's wrong with the TM8 now, but I'd wager the mains transformer is shorted.

There's a HP3586C that would do the job I was attempting, but there's even less chance of that working than of fixing the TM8.

Also the 3586 is too big & heavy to shift.

Ho hum.]]> https://golbornevintageradio.co.uk/forum/showthread.php?tid=9485 Wed, 20 Aug 2025 20:37:07 +0000 djrm]]> https://golbornevintageradio.co.uk/forum/showthread.php?tid=9485
  IMG_20250817_204428740_HDR-COLLAGE.jpg (Size: 313.48 KB / Downloads: 25)

My other acquisitions are more interesting, I have a Tektronix 2236 'scope. This one has a built in DVM VFD display to measure input waveform properties and also conventional 4mm jack inputs to use it as a traditional DVM. A precursor to modern scopes with everything displayed on the screen. its mainly working now, I'm waiting for some replacement transistors to fix the vertical display. The HP scope is a 1740A, I cant get the timebase to trigger so a bit more manual reading needed to identify where the problem could lie. The vectorscope and monitor are working, Ive tested them on my colour bar generator - a RIFA cap inside gave up during this test put it hasn't caused any further damage - I'm glad I tested it in the shed though because it smelt awful.

Best regards, David.]]>
  IMG_20250817_204428740_HDR-COLLAGE.jpg (Size: 313.48 KB / Downloads: 25)

My other acquisitions are more interesting, I have a Tektronix 2236 'scope. This one has a built in DVM VFD display to measure input waveform properties and also conventional 4mm jack inputs to use it as a traditional DVM. A precursor to modern scopes with everything displayed on the screen. its mainly working now, I'm waiting for some replacement transistors to fix the vertical display. The HP scope is a 1740A, I cant get the timebase to trigger so a bit more manual reading needed to identify where the problem could lie. The vectorscope and monitor are working, Ive tested them on my colour bar generator - a RIFA cap inside gave up during this test put it hasn't caused any further damage - I'm glad I tested it in the shed though because it smelt awful.

Best regards, David.]]> https://golbornevintageradio.co.uk/forum/showthread.php?tid=9465 Wed, 02 Jul 2025 12:11:05 +0000 ppppenguin]]> https://golbornevintageradio.co.uk/forum/showthread.php?tid=9465
I have the original user and maintenance manuals as supplied. They don't contain schematics, not even a decent block diagram. There is a list of modules, their functions and a few photos showing their locations. Unlike many Tektronix manuals, there is no faultfinding guide.

Looking at this video: https://www.youtube.com/watch?v=0VhyDC1DTCk&t=36s  it looks like there's a lithium thionyl chloride battery in there which is probably now dead. The manual mentions EEPROMs so it's not clear if calibration data is stored in battery backed RAM or not.

Any ideas? I'm off to the Broadcast Engineering Museum for a few days so won't be looking a the 4195A immediately.]]>
I have the original user and maintenance manuals as supplied. They don't contain schematics, not even a decent block diagram. There is a list of modules, their functions and a few photos showing their locations. Unlike many Tektronix manuals, there is no faultfinding guide.

Looking at this video: https://www.youtube.com/watch?v=0VhyDC1DTCk&t=36s  it looks like there's a lithium thionyl chloride battery in there which is probably now dead. The manual mentions EEPROMs so it's not clear if calibration data is stored in battery backed RAM or not.

Any ideas? I'm off to the Broadcast Engineering Museum for a few days so won't be looking a the 4195A immediately.]]> https://golbornevintageradio.co.uk/forum/showthread.php?tid=9419 Mon, 10 Mar 2025 13:54:48 +0000 Cagenut]]> https://golbornevintageradio.co.uk/forum/showthread.php?tid=9419
Recently bought a Farnell PSG520H synthesized signal generator, it was cheap for a reason...the frequency thumb wheels are hit and miss, and no modulation output, any info, service manuals or schematics would be greatly appreciated, would be very willing to pay for any copies

Regards Steve]]>
Recently bought a Farnell PSG520H synthesized signal generator, it was cheap for a reason...the frequency thumb wheels are hit and miss, and no modulation output, any info, service manuals or schematics would be greatly appreciated, would be very willing to pay for any copies

Regards Steve]]> https://golbornevintageradio.co.uk/forum/showthread.php?tid=9363 Sat, 16 Nov 2024 13:14:29 +0000 DrStrangelove]]> https://golbornevintageradio.co.uk/forum/showthread.php?tid=9363
http://www.nd6t.com/test/Cutoff%20Tester.htm

I've found lots of bits of junk to build it out of down the shed and in the office cum junk room.

Then I could test those 1000s of unmarked untested transistors I bought back in the 1970s that reside unregarded in a selection of pipe tobacco tins in said office cum junk room.

Then again, it would probably reside in said office cum junk room, as unregarded as are said transistors.]]>
http://www.nd6t.com/test/Cutoff%20Tester.htm

I've found lots of bits of junk to build it out of down the shed and in the office cum junk room.

Then I could test those 1000s of unmarked untested transistors I bought back in the 1970s that reside unregarded in a selection of pipe tobacco tins in said office cum junk room.

Then again, it would probably reside in said office cum junk room, as unregarded as are said transistors.]]> https://golbornevintageradio.co.uk/forum/showthread.php?tid=9361 Wed, 13 Nov 2024 12:13:21 +0000 Bushbaby]]> https://golbornevintageradio.co.uk/forum/showthread.php?tid=9361 I bought this model which was owned from someone who I dealt with well on the original work to build these about 13/14 years ago who has now passed away.
It does appear that it has been dropped at some point and now needs repair. Perhaps in one respect, this will be a good project to get this working yet again.

Best Regards

Rob

 
  LC Sussex top.jpg (Size: 304.48 KB / Downloads: 29)
  broken board.jpg (Size: 200.03 KB / Downloads: 29)
  Detached cap.jpg (Size: 250.99 KB / Downloads: 28)
  Circuit board 2.jpg (Size: 190.93 KB / Downloads: 28)
  circuit board 1.jpg (Size: 320.42 KB / Downloads: 29) ]]> I bought this model which was owned from someone who I dealt with well on the original work to build these about 13/14 years ago who has now passed away.
It does appear that it has been dropped at some point and now needs repair. Perhaps in one respect, this will be a good project to get this working yet again.

Best Regards

Rob

 
  LC Sussex top.jpg (Size: 304.48 KB / Downloads: 29)
  broken board.jpg (Size: 200.03 KB / Downloads: 29)
  Detached cap.jpg (Size: 250.99 KB / Downloads: 28)
  Circuit board 2.jpg (Size: 190.93 KB / Downloads: 28)
  circuit board 1.jpg (Size: 320.42 KB / Downloads: 29) ]]> https://golbornevintageradio.co.uk/forum/showthread.php?tid=9355 Sat, 26 Oct 2024 12:53:13 +0000 ppppenguin]]> https://golbornevintageradio.co.uk/forum/showthread.php?tid=9355  

Don't worry, it's not going anywhere near mains.

Also in the batch of kit was Tenma clamp meter. Are Tenma any good?

  fuke.jpg (Size: 809.4 KB / Downloads: 45) ]]>  

Don't worry, it's not going anywhere near mains.

Also in the batch of kit was Tenma clamp meter. Are Tenma any good?

  fuke.jpg (Size: 809.4 KB / Downloads: 45) ]]> https://golbornevintageradio.co.uk/forum/showthread.php?tid=9318 Fri, 02 Aug 2024 09:41:14 +0000 DrStrangelove]]> https://golbornevintageradio.co.uk/forum/showthread.php?tid=9318
I was prompted to do this my the discovery of several soldering irons that had just passed PAT testing (external firm) with melted leads.

I thought there was a requirement for some sort of inspection rather than just plugging the thing in a magic box & pressing a button.

But there you go.

The added advantage is that the silicone leads are much more flexible.

And it occupied an otherwise tedious couple of days during the summer vac when tumble weed might be viewed rolling along the corridors with the sound of a train whistle in the distance.]]>
I was prompted to do this my the discovery of several soldering irons that had just passed PAT testing (external firm) with melted leads.

I thought there was a requirement for some sort of inspection rather than just plugging the thing in a magic box & pressing a button.

But there you go.

The added advantage is that the silicone leads are much more flexible.

And it occupied an otherwise tedious couple of days during the summer vac when tumble weed might be viewed rolling along the corridors with the sound of a train whistle in the distance.]]> https://golbornevintageradio.co.uk/forum/showthread.php?tid=9316 Wed, 31 Jul 2024 18:19:33 +0000 bobhowe]]> https://golbornevintageradio.co.uk/forum/showthread.php?tid=9316 ]]> ]]> https://golbornevintageradio.co.uk/forum/showthread.php?tid=9278 Tue, 11 Jun 2024 11:39:25 +0000 david24]]> https://golbornevintageradio.co.uk/forum/showthread.php?tid=9278 David]]> David]]> https://golbornevintageradio.co.uk/forum/showthread.php?tid=9275 Tue, 04 Jun 2024 22:11:38 +0000 djrm]]> https://golbornevintageradio.co.uk/forum/showthread.php?tid=9275 I shall treasure it. It just needed a couple of 9 volt batteries to get it working.
Seems to be in good overall condition. I'll be comparing it a HP3478A which I have on loan.

  Philips-PM2505.png (Size: 1.54 MB / Downloads: 40) ]]> I shall treasure it. It just needed a couple of 9 volt batteries to get it working.
Seems to be in good overall condition. I'll be comparing it a HP3478A which I have on loan.

  Philips-PM2505.png (Size: 1.54 MB / Downloads: 40) ]]> https://golbornevintageradio.co.uk/forum/showthread.php?tid=9271 Tue, 28 May 2024 08:52:01 +0000 Gorey48]]> https://golbornevintageradio.co.uk/forum/showthread.php?tid=9271 Chris]]> Chris]]>