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50 Watt preamp problem.
Posted: Sun Jan 20, 2013 10:35 am
by Castorp
Hi everybody,
After changing preamp tubes the preamp tubes don't work any more. Tried new ones - same thing. They don't light up properly (glow just a little bit - power tubes light up like they should). Checked the heater voltages: 3,1 AC.
Need help!
Re: 50 Watt preamp problem.
Posted: Sun Jan 20, 2013 10:50 am
by ol foot
Drain the caps and try to re-tension the socket pins first and see if that helps. Could also be a dodgy solder joint on the socket .
Re: 50 Watt preamp problem.
Posted: Sun Jan 20, 2013 11:35 am
by Castorp
The sockets look good. I checked the heater line with a meter :OK . In standby the preamp tubes get a little warm, but simply not as hot as they should get.
Re: 50 Watt preamp problem.
Posted: Sun Jan 20, 2013 3:01 pm
by demonufo
Preamp tubes don't get all that hot. I suspect the heaters are not your problem.
Re: 50 Watt preamp problem.
Posted: Sat Jan 26, 2013 1:13 pm
by Castorp
Now, after re-soldering (can you put it this way- in English?) everything is fine. You where right, it was not the heater!
Thanks for helping!