Crate V5 no power to preamp tube or power light

Hi there,

Anyone have any experience with the Crate V5? This is an amp I modded awhile back...
For some reason, I have no power going to the preamp tube, or the power LED. Checked all fuses, tried different tubes, dead as a doornail. EL84 power tube gets nice and hot, I hear an audible click when I use my pentode triode switch I wired in a while back, but since last night there's no power to the preamp tube.

I'm thinking it's got to be a resistor or a cap that blew or something, but I am having a hard time tracking it down. There's only 2 things I can think of that may have happened, I bumped a small cap or resistor with my soldering iron, or when soldering near the op amp for a brief second I got the op amp hot (but I only touched one leg of the op amp a moment)

The only thing I changed last night was a cap in c24 which adds a little bass to the signal. I went back to the old cap to make sure it wasn't the new cap, still no power..

Odd that the power light isn't getting any power also. I thought I would toss it out there and see if anyone has any experience with losing power to the preamp socket and power LED.

Thanks,
Tim

whoops wrong thread.

not sure about the V5, but many (most) tube amps use the same 6vac power to light the panel lamp as they use for the tube heaters and they are connected in series. It's possible that somehow you damaged the trace or a connection to the preamp filament and the panel lamp. I would trace the connections from the preamp tube filament back to the previous connections using a continuity tester until you find the break.

update: I just found/looked at the V5 schematic and it looks like the connector for the panel lamp is right adjacent to the key resistor/capacitor combo that drives the preamp filament voltage. you may want to look at J8, R21, C18, C12 and the circuit traces around them. Also, since the lamp/filaments arent on the same power supply branch, there's a chance something more is going on, so I suggest you check all of the power supply voltages to verify they're in spec.