PYE Piper P117-Capacitor Question

[Old Sparky]

The question being 'Are there any caps. in this radio which should be replaced with Class Y types, given that this is a 'live chassis' design ( I hasten to add that I've replaced the original twin white mains lead with a length of modern mains lead and ensured that the chassis is connected to Neutral)  I'm thinking particularly of C6 (1800pf) between the AM aerial circuit and chassis, C3 (10nf), also in the AM aerial circuit, and maybe a couple of others?  

[AlanBeckett]

Which Piper is it?

Alan

[Old Sparky]

This is the AM (MW & LW)/ FM model, which, although it uses valves with 6v3 heaters, fed via an isolatting transformer, it's HT+ is derived directly from the mains, which supplies the 2 anodes of an EZ80 via two 120 ohm resistors, so it is essentially a live chassis design. Not that this next is directly relevant, but it doesn't use the ubiquitous ECH81. Instead, an ECC85 is used as the AM Mixer/Oscillator, as well a performing the same function on VHF. The circuit was in one of the RTVC Books. I have a photocopy, but no means of scanning documets at this time, due to upgrading from W7 to W10.

[pwdrive]

Is it a P117?

Lawrence.

[Geordie McBoyne]

The Pye Piper range consisted of the AM only models P115 and P116, the former having permeability tuning and the latter having a conventional tuning capacitor.
The really clever set and which is the subject of this topic was the AM/FM Piper, the model P117.
Information for this set can be found in the 1958/59 Radio and Television servicing book.
There was a fourth model, the AM only "Luxury Piper" model P118.

Geordie McBoyne.

[AlanBeckett]

We both must be feeling fairly dim Lawrence, it's in the Title

Alan

[pwdrive]

We both must be feeling fairly dim Lawrence, it's in the Title

Alan

Yeah, guilty to that, I've been at war with the garden hedge for the last few days, still at it, I think it's done my head in.

Lawrence.

[Old Sparky]

The photocopy I have is of the 1958/59 RTVC Articles, Geordie, but, as I said, I cannot scan anything and post it, because as I said, since upgrading to W10 , neither of my scanners work

[AlanBeckett]

It's on the BVWS CDs - 1347.

Alan

[AlanBeckett]

A snippet of the front end.
R1 is 2M2, C1 is 22p and C2 is 1800p, Type unknown.

   

Alan