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Help needed with a Pye P35 valve radio

  • Thread starter eu.thundernews.com
  • Start date
E

eu.thundernews.com

Jan 1, 1970
0
Hi, I am planning to restore the above as I can get hold of the components.
The radio receives lw/mw and 6 sw bands.

It was working ok and then the volume suddenly dropped to about half that it
should be, the potts have been cleaned and are not noisy.

The radio picks up all the channels it did previously but it is quiet and
turning the volume pott up or down does pretty much nothing.

Could anyone point me in the general direction of which component/s to look
for as the culprit/s?

Any help would be massively appreciated.

I will post the schematic on alt.binaries.schematics.electronic entitled
'Pye P35 Schematic'

Thanks for any help guys.
 
S

Sky

Jan 1, 1970
0
Stephen J. Rush said:
If the audio output tube died, you'd get no sound at all, not about half-
volume. It's not uncommon for old carbon resistors to increase in
value. Coupling capacitors develop leaks, but that usually causes
obvious distortion. The nice thing about troublshooting tube gear is
that you can measure resistors in-circuit (With the power off!). If you
have the schematic, it probably gives DC voltages; knowing which voltage
is out of spec you can usually deduce which component might be bad.

Thanks to you both for your replies (I'm on another pc that's why my name's
changed)

I didn't know that you could test resistors in-circuit with tube gear-nice
tip! My friend has the same model of radio and has offered me the chance to
use his tubes to test in mine.I am concerned that if something has damaged
one of my tubes it might blow one of his-do you think this is a possibility?
 
G

Geo

Jan 1, 1970
0
My friend has the same model of radio and has offered me the chance to
use his tubes to test in mine.I am concerned that if something has damaged
one of my tubes it might blow one of his-do you think this is a possibility?
Me again - I would not risk it. If C40 is leaky and putting a positive voltage
on the EL33 grid it will not be happy. Check the voltages first - guessing about
5v on the EL33 cathode and 260v on the anode.
If your weak volume is especially lacking bass then c40 may just have reduced in
value - try a parallel cap (correct voltage rating).

Geo
 
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