DIYbanter - View Single Post - Tried to recap a tube receiver, and failed.

R!

(Derwin) wrote in
news:6mzYh.5305$Dq6.3498@edtnps82:

I tried to re-cap a tube receiver (amplifier + tuner), and now when I
turn it on it starts playing music for a few seconds after it warms
up, then the music fades out and and hum takes over. I don't really
know what I'm doing, and the wiring inside looks like a mess of
spaghetti. I'm pretty sure I replaced the caps properly, but I used
.068uf WIMA caps to replace .050uf wax/paper caps, and I'm wondering
if the value difference, added up over 8 caps would make a difference?
Other than that, does anyone have any advice based on my description
of the unit's behavior? Any comments whatsoever might be helpful..

Do you have a tube manual, look up G1 of the preamp and power output
tubes. Check the dc voltage when it is not working they should not be a
positive voltage on them if so check the new capacitor connected to that
tube. Extremely high negative voltage check the grid resistor.

Of course I assume you have a high imput impeadance voltmeter there.

I would like the brand and model # if you wouldn't mind.

R!