Pye Caprice R31 - UK Vintage Radio Repair and Restoration Discussion Forum

Lighthouse · 26th May 2019, 7:03 pm

Hi
I have a Pye R31 which I have restored, the only problem with it is that on VHF the front end seems to be overloaded.
On stronger stations, the sound is distorted and on weaker stations it is ok.
The tuning on VHF seems to be over sensitive.
All voltages are pretty close to the Trader Sheet data.
The distortion does not appear to be in the audio stage as this is working fine with medium wave.
Can anyone shed any light on what might be happening as trying to find the problem is doing my head in.
Thank you.

Nuvistor · 26th May 2019, 10:23 pm

Has C42 (makers circuit) been replaced remembering the positive lead goes to chassis?

The diode on pin 7 V3 appears to be AGC delay, R19 4.7M feeds the AGC line for VHF, perhaps worth checking that area.
R14 is another high value resistor 22M in that circuit.

Lighthouse · 29th May 2019, 7:02 pm

Have replaced R19 and14, will try the capacitor.
Thank you

Restoration73 · 2nd Jun 2019, 2:06 pm

I did the R37 Rancher version some time back. Instability on VHF was cured by a short
strap (copper braid) between the main chassis and the FM tuner head body.

26th May 2019, 7:03 pm	#1
Lighthouse Diode Join Date: May 2019 Location: Gourock, Renfrewshire, UK. Posts: 4	Pye Caprice R31 Hi I have a Pye R31 which I have restored, the only problem with it is that on VHF the front end seems to be overloaded. On stronger stations, the sound is distorted and on weaker stations it is ok. The tuning on VHF seems to be over sensitive. All voltages are pretty close to the Trader Sheet data. The distortion does not appear to be in the audio stage as this is working fine with medium wave. Can anyone shed any light on what might be happening as trying to find the problem is doing my head in. Thank you.

26th May 2019, 10:23 pm	#2
Nuvistor Dekatron Join Date: Aug 2013 Location: Wigan, Greater Manchester, UK. Posts: 9,433	Re: Pye Caprice R31 Has C42 (makers circuit) been replaced remembering the positive lead goes to chassis? The diode on pin 7 V3 appears to be AGC delay, R19 4.7M feeds the AGC line for VHF, perhaps worth checking that area. R14 is another high value resistor 22M in that circuit. __________________ Frank

29th May 2019, 7:02 pm	#3
Lighthouse Diode Join Date: May 2019 Location: Gourock, Renfrewshire, UK. Posts: 4	Re: Pye Caprice R31 Have replaced R19 and14, will try the capacitor. Thank you

2nd Jun 2019, 2:06 pm	#4
Restoration73 Nonode Join Date: Jun 2013 Location: Surbiton, SW London, UK. Posts: 2,801	Re: Pye Caprice R31 I did the R37 Rancher version some time back. Instability on VHF was cured by a short strap (copper braid) between the main chassis and the FM tuner head body.