"greenpjs" wrote in message
...
On Fri, 02 May 2008 09:09:22 -0700, Don Bowey
wrote:

On 5/2/08 7:18 AM, in article ,
"eu.thundernews.com" wrote:

`
"James Sweet" wrote in message
news:I2rSj.3067$5X.2122@trndny08...


"eu.thundernews.com" wrote in message
...
Hi, I am planning to restore the above as and when 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.




I'd start by checking the volume control itself and solder joints in
the
audio section. What sort of audio output device does it use? Amplifier
IC,
or one made of discrete transistors?




Thanks for your reply, the radio is a valve job made in 1950. The
circuitry
appears to the eye to have aged well but of course with something this
age
there could be all sorts of things that need sorting. But I guess the
audio
output device is valve based.



If you can only guess that "the audio output device is valve based,"
after
seeing the schematic, you should just take it to a repair shop. It's well
beyond your near-term capabilities.

If you do continue to investigate yourself, remember that this is an
AM receiver. The volume is not only affected by the audio amplifier
and related components. Even the RF amplifiers and demodulators can
vary the volume. Perhaps the automatic gain control (if any) is
malfunctioning.



I will continue and with the help of people like yourself giving me such
useful and relevant information as you have it will make it happen all the
faster. You have given me several areas to follow up there and taught me
something very interesting. Thank you