10-10-2018, 09:28 AM
Mark Pirate can be found over on the UKVRRR forum.
Boater Sam.
Aurora converter news
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10-10-2018, 10:22 AM
Jeffrey,
Mark's entry in the services offered section of UKVRRRR https://www.vintage-radio.net/forum/show...p?t=101962 I can PM him a link to this thread to see if he is interested. Al
Tuned for maximum smoke .
10-10-2018, 10:48 AM
Alistair, thanks for offering to contact him. Really need a phone number since the gentleman with the TV that needs work isn't on the internet.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
10-10-2018, 11:37 AM
I have PM'd Mark the link to this thread. Will PM you his response with, hopefully, a phone number.
Al
Tuned for maximum smoke .
12-10-2018, 12:53 PM
I've contacted the guy in Sussex to give him Mark Pirate's details. I've also given him John Wakely's number. Don't know if John is doing repairs commercially these days but there are few who are more competent than he.
I realised that the owner, not being online, wouldn't have had the instructions for the Aurora. These are only available as a download. While using an Aurora is 2nd nature for most of us it only takes something as daft as expecting RF from the video output socket to make things not work at all. Don't laugh - we can all make really silly mistakes on occasion. I may have mentioned the "faulty" Aurora I saw that had no power due to the hole in the power conenctor being slightly laerger than the pin in the Aurora's socket. Without naming names, this belonged to a normally very competent member of the vintage community. I spared his blushes at the time and have now forgotten exactly who it was.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
17-10-2018, 01:29 PM
Howard came with his Aurora this afternoon. Again it's no fault found. Both he and John Wakely saw giving symptons that looked like jittery line hold. We saw nothing except a possibly dodgy power inlet connector which was a touch intermittent if you jiggled it. Howard's PSU was a switchable voltage wall wart. I took it down from 9V to 7.5V to minimise heat disspation in the Aurora. The minimum that reliably works is 7V.
I also put Stepehn Evans' Aurora back ont hebench and finally saw the slow boot problem that he's had. It's definitely the main 3.3V regulator. Ideally this should be changed but my bodge of a 1K pull-up from it's "power good " output to 3.3V works OK. So that's how I'll leave it. Apart from my Prowest PM14/1A monitor having field collapse my beloved Tek 2465B scope has a problem. Channels 1 and 2 are crushing the waveform somewhat as you move them down the screen. Channels 3 and 4 are OK. I just hope it isn't one of the unobtanium hybrids that's failed.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
17-10-2018, 05:49 PM
(This post was last modified: 17-10-2018, 05:50 PM by ppppenguin.)
l got the Prowest on the bench. Field was collapsed but it grew to full size within a minute. It's now staying that way. Switch it off for half an hour and it works perfectly. Will leave it off overnight and see. Will need to have scope probes on the timebase board before I switch on.
Looks just a like a lazy field output valve but the Prowest is fully solid state. Needn't be the field scan board, might conceivably be the sync board or even the power supply but the rails are likely to be used elsewhere. All electrolytics were replaced a few years ago but I can't discount one of them going funny since then.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
18-10-2018, 07:17 AM
The monitor is perfect this morning. My guess is that an electrolytic had depolarised and came back to life over the first minute of operation after several months without being used. Short of changing all the electrolytics that could affect the field scan there's nothing I can do to diagnose the fault.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
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