This thing is turning into a real PITA!
I isolated the input jack. No effect.
I removed completely the Herzog line out. No effect.
I tightened the contacts on the tube sockets. No effect.
I tested the tubes again, this time in another amp. They work fine.
I didn't have a spare rectifier tube, so I replaced it with a couple of 4007s. I didn't measure the voltages before doing this, but it seems to have bumped them up substantially.
They read as follows:
V1 - pin 6, 149 / pin 1, 154
My plate resistors are 180K.
V2 - pin 7, 372
C4 - a, 372 / b, 372 / c, 255
I changed R12 (between C4a and b) to a 3.3K. Odd that there was no voltage drop at all after the 3K3. Should that be a 1 watt resistor? All other resistors are stock values, and all read at or near their stated values.
There was a change when I put in the solid state rectifier. Whereas before I could get a fairly normal clean sound at low volume if I played lightly, now I have to turn it way up to get any sound at all. And there's no clean sound at all. But the thing where the sound disappears when I hit it hard and then returns slowly continues.
I really hate to change out those power sply. caps. It's gonna be a pain. But that's about the only thing left. Anymore ideas to save me from this chore?
I isolated the input jack. No effect.
I removed completely the Herzog line out. No effect.
I tightened the contacts on the tube sockets. No effect.
I tested the tubes again, this time in another amp. They work fine.
I didn't have a spare rectifier tube, so I replaced it with a couple of 4007s. I didn't measure the voltages before doing this, but it seems to have bumped them up substantially.
They read as follows:
V1 - pin 6, 149 / pin 1, 154
My plate resistors are 180K.
V2 - pin 7, 372
C4 - a, 372 / b, 372 / c, 255
I changed R12 (between C4a and b) to a 3.3K. Odd that there was no voltage drop at all after the 3K3. Should that be a 1 watt resistor? All other resistors are stock values, and all read at or near their stated values.
There was a change when I put in the solid state rectifier. Whereas before I could get a fairly normal clean sound at low volume if I played lightly, now I have to turn it way up to get any sound at all. And there's no clean sound at all. But the thing where the sound disappears when I hit it hard and then returns slowly continues.
I really hate to change out those power sply. caps. It's gonna be a pain. But that's about the only thing left. Anymore ideas to save me from this chore?
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