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Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only. |
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31st Jul 2021, 7:08 pm | #41 |
Heptode
Join Date: Jun 2005
Location: Sunderland, Tyne and Wear, UK.
Posts: 661
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Re: Pye AM/FM Piper P117.
Hi David could you scope both P117 and compere readings for hum on the other one and find out why both hopeless on LW
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28th Nov 2021, 9:52 am | #42 |
Dekatron
Join Date: Sep 2015
Location: Southwold, Suffolk, UK.
Posts: 8,336
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Re: Pye AM/FM Piper P117.
On revisiting the design of that ECL82 AF stage, it still looks capable of good audio with its NFB and use of the OPTX primary to aid smoothing - and if it were on a well spaced out chassis - but not possible in the dreaded compact Piper. A limiting factor might well be "that" very low value grid coupling cap?
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