"Nick Gorham" wrote in message
. uk...
Keith G wrote:
(As opposed to *pinged off*?? :-)

As you're aboot Don Old...

I've emailed Nick Gorham to no effect (inconsiderate sod has probably
buggered off on holiday),

Chance would be a fine thing. I never got your email Keith. Anyway....


Direct response received and replied to!



If (with my zero knowledge) I can't bash 'em straight *with some
guidance*, they will end up at the local (shiny Nigel's) hifi shop
for the odious techie *Andrew* to sort them out and I don't think I
could stand the 'loss of face'...!!


Without knowing the circuit its a bit of a guess, but my first thought
would be to check if the coupling caps have become leaky. (assuming
there are any).


He has replaced the two 100 uF caps which I deem to be the coupling caps
with a single 220 uF cap on the 'bad' amp and it has been fine for a
while...



Check the voltage between the 300b grid and ground. I would expect
something like -70v. If the coupling cap is leaking it will be higher
than that.


OK - powered up with dummy loads.

Grid to Ground:

Good Amp - a *continually* changing 0.04 to 0.06 VDC

Bad Amp - steady 202 VDC (???)

Are we on the money so soon?



Have you considered painting the valve bases and sockets so he may be
able to work out what goes where? Or faining that, strike hime on the
head with the nearest outout transformer and tell him to get a clue?


Oh, he's learning!! - It doesn't help the bloody amps are *handed*!! :-)

They're both still on - are we doing further damage??