Saturn GA-45RVT Low Power

[drewl]

MOTHA*&^%$$ just typed out a long post and it crashed adding schem

Anyway, Gibson Saturn GA-45RVT, 6L6 with broken pin installed wrong, blew fuse and 470 Ohm screen.
Replaced resistors and output tubes for testing.
Amp works, all features but only a few watts output.

V5A stage doesn't amplify, is it supposed to or just a phase splitter?
Also voltage on V5 pin 5 only 30v instead of 60v.
Amp varies greatly from schem between V4 and V5A, output pins 6 & 7 tied together, and instead of a mixing circuit theres an odd attenuator similiar in design to the schem, but different values.
Jumping across from V4 to V5A with a cap and amp puts out rated power.

Info:
All voltages close to schem value except V5 pin 5
No hum noise, minor ripple, so filter caps look decent.
Tone stacks really kill signal between stages, I guess the idea was to amplify signal to power amp with the 6FQ7.
Amp also has a few of those crappy caps used in Thomas Vox amp that need to go!

[drewl]

Ugh, here's schem

[drewl]

Nobody really familiar with these?

[Jazz P Bass]

Any one of the caps, C13-C16, could be leaking & throwing off the Vdc & the signal voltage.
C14 &/ or C16 would be my first thought.

[sherpakahn]

V5A is [cathode-biased] cathodyne phase splitter. It's a (practically) unity-gain stage feeding the 6FQ7 gain stage/drivers. Yes, yes. This thread may be old, but not as old as those filter caps...input to a bootstrapped phase splitter such as this will be a VERY high-z node, so a multimeter reading will be affected by the meter loading...