Crate V50 ?

[chipprogr]

physically look at the pins on the tube socket of V1. With it powered OFF ,There maybe a bad socket pin and also do a continuity check to make sure the socket (tube side) has continuity to R75. and pin 8 to chassis ground measures 2.7k ohms. Cracked trace here??? Dont jumper around yet, your voltages are not reading right on V1b to play around with yet.

[Jazz P Bass]

Crate V50

I think that we have two problems for sure.
Dirty Channel : low volume
Tone Control: InOp
Dirty Channel: No voltage drop across R75 must be fixed.
V1B plate resistor: R75, 100K: does it terminate at V1B, pin 6
V1B cathode resistor:R78, 2.7K: Is it 2.7K and does it terminate at ground.
Tone Control: Measure
Vdc of V2A, pin 1,2 & 3
Vdc of V2B, pin 6,7 & 8
Tone control ground: R21,68K /C17.001uf :does this point terminate at ground?

[bill128]

When I checked R78 it was in fact 2.7K. However it did not have a connection to ground. When I corrected this everything else fell into place and all problems were resolved. I'm not sure why the tone circuit didn't work before but does now.
Thanks to everybody who responded to my request for help. You guys are great. I've never worked with tubes before and in this process I have learned much. Thanks again.
Bill128

[chipprogr]

Great news, glad we can be of help. Sounds like your tone circuit and the 2.7k resistor have a common grounding point and it somehow became seperated from the rest of the ground path. How did you fix the ground issue? just curious.. bad solder joint, cracked trace?? loose screw??

Take care-Eric

[bill128]

When I pulled out the circuit board I looked at the connection on the bottom and it appeared to have been repaired at some time. The trace was damaged and had lost continuity. What I did was to pull one side of the resistor up and that leg just reached a mounting screw which is ground so I just put it under the washer and tightened away.

[Jazz P Bass]

Crate V50

Great job.
Persistance pays off.

[ingwar]

I need Crate v50 full schematic with output section and power supply.
Please, Help!

[pecorporation]

Crate V50 schematics

Here you go!

All files.zip

[ingwar]

Thanx!!!