View Single Post
Old 18th Dec 2009, 3:26 pm   #2
Steve_P
Dekatron
 
Steve_P's Avatar
 
Join Date: Sep 2003
Location: Bolton, Greater Manchester, UK.
Posts: 6,644
Default Re: Newb Stumped on a Derwent

Start by measuring the HT in the working then the fault condition. If this is OK, when the set goes faulty, put a signal in at either the gram sockets or the volume control. If this is OK, work back, if not, work forward.

Try cleaning the wavechange switch and the valve pins and sockets. There are all sorts of strange faults here, all caused by muck.

When it goes quiet, try adjusting the tuning - it may be going off tune. Has happened to me once.

Try and find out where the fault is and we can take it from there. Also take readings off all the valves in the fault condition too.

Do you have a signal generator? If yes, try putting the IF in and see if this comes out. Another idea is to get another radio and try and pick up the local oscillator. What is the model of the set - the circuit/manual may be on top there.

Cheers,

Steve P.
__________________
If we've always had it, why is the Car Boot open? You're not sneaking another Old TV in are you...?

Last edited by Steve_P; 18th Dec 2009 at 3:31 pm.
Steve_P is offline