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

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Old 16th May 2024, 5:36 pm   #1
mediaseller
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Default PYE P35 Cambridge Restoration

Hi, I wonder if anyone can help please?

I'm restoring one of these, and although I took plenty of pictures before I started, I'm having difficulty locating C45 on the underside.

Even though I have the schematic and layout, it's still difficult. Does anyone have photos of the underside of this model.

I found one on Radiomuseum, but the only picture is fuzzy and has a watermark. You can't download it.

Thanks in anticipation.
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Old 16th May 2024, 5:51 pm   #2
Station X
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Default Re: PYE P35 Cambridge Restoration

Which service sheet are you using?
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Old 16th May 2024, 6:28 pm   #3
mediaseller
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Default Re: PYE P35 Cambridge Restoration

Hi.

PYE P35 Service Sheet purchased and downloaded from this site. It doesn't say Cambridge.

The ones on Radiomuseum are not much better.

See this link https://www.dropbox.com/scl/fi/570i3...=4yn0ruy3&dl=0
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Old 16th May 2024, 6:53 pm   #4
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Default Re: PYE P35 Cambridge Restoration

You can't see this capacitor on the Radiomuseum picture.

It may be hidden in some heatshrink.

It's the tone correction capacitor and it may have been put directly onto the tags of the output transformer either by the restorer or the manufacturer.

under the chassis it would go from the HT connection of V5 to the anode of V4.

Snips attached from the trader sheet and the PYE sheets.

Cheers

Mike T
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Old 16th May 2024, 7:17 pm   #5
mediaseller
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Default Re: PYE P35 Cambridge Restoration

Hi.

Many thanks. I think I've sorted it out now.

I'll just wait for the blue flash when I switch on. LOL
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Old 16th May 2024, 8:19 pm   #6
mediaseller
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Default Re: PYE P35 Cambridge Restoration

What a bummer.

Spent a week on and off, replacing waxy caps and re-stuffing the filter cap, only to find that the mains transformer primary winding is open circuit internally at the start of the winding.

It's a basic error that I should have checked this before commencing. Oh well, it's all good experience. It's my first time fixing a valve set.

Unlike David Tipton on YouTube, I haven't got the equipment or materials to rewind it.
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Old 16th May 2024, 8:30 pm   #7
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Default Re: PYE P35 Cambridge Restoration

These big PYE's turn up in poor condition its worth putting a request in for a replacement transformer as a wanted post.

its not a particularly big transformer so a Sub should not be too hard to find.

Cheers

Mike T
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Old 17th May 2024, 8:02 pm   #8
Ed_Dinning
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Default Re: PYE P35 Cambridge Restoration

Hi, if you are not too concerned about originality it should be possible to find a similar transformer that can be grafted in space permitting. A much cheaper solution than a rewind,

If you have no success in the next few weeks PM me and I'll see what I have in my used/ tested stash

Ed
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Old 17th May 2024, 8:10 pm   #9
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Default Re: PYE P35 Cambridge Restoration

It's just a 4+R superhet despite the tuning scale, so most scavenged transformers should work. You may need to use a different rectifier or use silicon if the transformer doesn't have a 4V winding.
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