|
Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only. |
|
Thread Tools |
11th Jun 2021, 11:04 am | #1 |
Diode
Join Date: Jun 2021
Location: Knebworth, Hertfordshire, UK.
Posts: 1
|
PYE Q4 Jewel case audio stage
My Pye Q4 has just stopped working. The speaker was making faint popping sounds. I found that the output transformer appeared quite warm and the supply voltage was much lowered than 9V. I think it could be the audio transformer, but its resistance readings appear to be ok. I have used an earpiece and can trace the radio signal all the way from the AF stage and out of the AB amplifier transistors. Any ideas? I have ordered a transformer from RS as suggested in one of the website pages but its not arrived yet. Many thanks for reading
|
11th Jun 2021, 11:15 am | #2 |
Moderator
Join Date: Dec 2010
Location: Exeter, Devon and Poole, Dorset UK.
Posts: 6,875
|
Re: PYE Q4 Jewel case audio stage
Hello and welcome to the forum.
There are two versions of this set a 6 transistor and a 7 transistor. Either way it looks as if the output transistors are drawing too much current. Do you have a multimeter? the service data is available for both types here. https://www.service-data.com/search....&search=Search Cheers Mike T
__________________
Invisible airwaves crackle with life or at least they used to Mike T BVWS member. www.cossor.co.uk |