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Success Stories If you have successfully repaired or restored a piece of equipment, why not write up what you did and post details here. Particularly if it was interesting, unusual or challenging. PLEASE DO NOT POST REQUESTS FOR HELP HERE! |
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22nd Jul 2022, 8:15 am | #1 |
Hexode
Join Date: Feb 2008
Location: Wrexham, North Wales, UK.
Posts: 465
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Pye QAC38
I was given this lovely set last year by a Forum member, but have only just got around to looking at it.
To my surprise, the output transformer and speaker field coil were both intact. Despite this, not even a hum from the speaker. The output valve (Mullard PenA4) had zero emission and the rectifier had one heater o/c. However, replacements in stock, so that was no problem. The usual capacitors were changed, plus the electrolytics in the power supply, and it burst into life. Next, the case. It was intact but rather battered, with some big scratches and the speaker cloth torn. I sanded it down by hand (using an electric sander can go through the veneer!) and applied Danish oil. I wanted to keep the Pye logo on the top, so sanded carefully around it. Finally, alignment. Fortunately this is entirely by trimmer caps, so quite easily done. Warning to anyone working on one of these - one of the brass trimmer nuts on each of the IFTs is at HT potential! Job done, and I am really chuffed with the result. |
22nd Jul 2022, 11:12 am | #2 |
Nonode
Join Date: Jun 2007
Location: Coulsdon, London, UK.
Posts: 2,152
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Re: Pye QAC38
Well done.
If the PenA4 really is zero emission, it could be a dry joint inside one of the hollow valve base pins. I have one of these with a missing speaker cloth and a hot mains transformer. Where did you get that new speaker cloth? |
22nd Jul 2022, 11:20 am | #3 |
Octode
Join Date: Sep 2017
Location: Bristol, UK.
Posts: 1,642
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Re: Pye QAC38
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23rd Jul 2022, 2:03 pm | #4 | |
Hexode
Join Date: Feb 2008
Location: Wrexham, North Wales, UK.
Posts: 465
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Re: Pye QAC38
Quote:
There is an American dealer on Ebay that has some pretty good '30s style speaker facric, but it's about £15 for a 12 inch square. |
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23rd Jul 2022, 4:45 pm | #5 |
Dekatron
Join Date: Jun 2005
Location: Warnham, West Sussex. 10 miles south of DORKING.
Posts: 9,145
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Re: Pye QAC38
Looks really great. I have had this similar PYE for over 25 years but I don't know the model number! Pye were very bad at this and didn't put model numbers on TV and radio until 1950. It is slightly different to your example. I also have the radiogram version. John
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25th Jul 2022, 8:19 am | #6 | |
Hexode
Join Date: Feb 2008
Location: Wrexham, North Wales, UK.
Posts: 465
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Re: Pye QAC38
Quote:
Pye made some splendid sets in the late '30s but they didn't put the model number on them. |
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