where to discharge the capacitor on this amp

[doctorunderhill]

curious as to which location on this circuit to discharge this amp. i have done discharges on a several Fenders (Pro Reverb and a Princeton, but not familiar with the particular amp.

 

[skoora]

I’m not certain of the pin number, but doesn’t connecting Pin 1 (or the correct one) of V1 to the chassis ground and doing a power down without using standby (if present) drain the caps quite fast?

 

[glpg80]

Use a volt meter to test all of the supply nodes to make sure they’re discharged. Anything holding a constant voltage not discharging is what will need manually discharged.

 

[doctorunderhill]

I’m not certain of the pin number, but doesn’t connecting Pin 1 (or the correct one) of V1 to the chassis ground and doing a power down without using standby (if present) drain the caps quite fast?

thanks for the input skoora. i appreciate it.

 

[doctorunderhill]

Use a volt meter to test all of the supply nodes to make sure they’re discharged. Anything holding a constant voltage not discharging is what will need manually discharged.

first of all, thanks for taking the time to respond to my question. when you refer to the supply nodes are you talking about specific pins on the other preamp/power tubes?

 

[glpg80]

first of all, thanks for taking the time to respond to my question. when you refer to the supply nodes are you talking about specific pins on the other preamp/power tubes?

All supply nodes in the amplifier based on the schematic you shared. Damage to equipment and harm to yourself can happen from anything holding residual charge, not just lethal high voltage.

If you need more help from here it’s more related to reading a schematic. If you don’t know what supply nodes are I suggest you pause what you’re doing in the amplifier. When things are broken in a circuit, things can act in a way that schematics don’t annotate. If you can’t outline the basic nodes of the supplies, then you’re likely going to chase your tail trying to repair things that are damaged causing odd states of operation.

 

[FourT6and2]

With the amp off, attach an alligator lead to V1a plate and the other end to chassis ground. The caps will all slowly drain through the B+ dropping resistors and plate resistors. Obviously, the alligator leads must be insulated... don't touch the actual alligator with your bare hands.

 

[FourT6and2]

I’m not certain of the pin number, but doesn’t connecting Pin 1 (or the correct one) of V1 to the chassis ground and doing a power down without using standby (if present) drain the caps quite fast?

Do not do this. The amp needs to be off.

 

[311boogieman]

If you don’t know what supply nodes are I suggest you pause what you’re doing in the amplifier.

this

no offense @doctorunderhill but based on some of your other similar threads in this particular subforum I would suggest you take this (and all others) to a tech if you have problems. you strike me as someone (possibly) that buys cheap amps on the cheap and then tries to fix/flip them yourself.