04-16-2015, 04:59 PM
Is there any noise? Hum? Are all heaters lit?
First, i would re-seat each tube. Could be as simple as a dirty, loose, or poorly seated tube pin. Note if the tubes wiggle in their sockets.
If you do that and the issue persists and if you are familiar with high voltage amps: remove the chassis and look for any components that have broken leads, heat damage, bulges, cracks, or other visible signs of wear. With the chassis out, you can tighten up the tube sockets.
You might also consider taking the ext amp out into a separate power amp, this will isolate the preamp from the power amp. Doubtful the issue is in the preamp though.
How long did it go untouched? Sounds like it might have been moved around to a new location, right?
First, i would re-seat each tube. Could be as simple as a dirty, loose, or poorly seated tube pin. Note if the tubes wiggle in their sockets.
If you do that and the issue persists and if you are familiar with high voltage amps: remove the chassis and look for any components that have broken leads, heat damage, bulges, cracks, or other visible signs of wear. With the chassis out, you can tighten up the tube sockets.
You might also consider taking the ext amp out into a separate power amp, this will isolate the preamp from the power amp. Doubtful the issue is in the preamp though.
How long did it go untouched? Sounds like it might have been moved around to a new location, right?