Biasrocks
Well-known member
The schematic calls for around 450v on the plates of the 6L6's in this guy, I measuring close to 500v on the plates under load. The amp is basically eating expensive NOS tubes for dinner.
Ampeg calls for a 5U4/GZ34 rectifier which I'm sure contributes to the problem. I've not been able to find any information on suitable subs for the GZ34 which will allow lower voltages that will seem to work without damaging the amp.
I'm thinking of putting a 10W resistor after the rectifier to knock down the voltages to a reasonable level or replacing the GZ34 with something else.
Anyone have a suggestion for substitutions in this circuit?
Schematic is here.
http://www.kbapps.com/audio/schematics/tubeamps/ampeg/images/b15n.gif
Mark
Ampeg calls for a 5U4/GZ34 rectifier which I'm sure contributes to the problem. I've not been able to find any information on suitable subs for the GZ34 which will allow lower voltages that will seem to work without damaging the amp.
I'm thinking of putting a 10W resistor after the rectifier to knock down the voltages to a reasonable level or replacing the GZ34 with something else.
Anyone have a suggestion for substitutions in this circuit?
Schematic is here.
http://www.kbapps.com/audio/schematics/tubeamps/ampeg/images/b15n.gif
Mark