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Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only.

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Old 11th Jun 2021, 10:04 am   #1
Turnbull
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Location: Knebworth, Hertfordshire, UK.
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Post 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
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Old 11th Jun 2021, 10:15 am   #2
Cobaltblue
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Location: Exeter, Devon and Poole, Dorset UK.
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Default 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
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