Can I work safely inside a Mesa amp ?

[mbmesa]

I need to change a volume pot in my Tremoverb. Can anybody confirm that a Tremoverb has bleed off resistors so that the filter caps are discharged when the amp is turned off ? On my old fenders I have to discharge the caps before working on them or risk being fried. What about Mesa's ?

 

[AdmiralB]

Yes, it does. BUT you must leave the standby in the 'play' position - the bleeders are on the first bank of filters and if you turn the standby off the preamp/screen filters can retain a charge.

 

[mbmesa]

Thanks for the reply. Does the method of checking the voltage on pin 1 on the first preamp tube work on Mesa's to verify that there is no more voltage in the caps ? (its the old Fender method)

 

[AdmiralB]

Yep!

 

[fishyfishfish]

I think the old Mesa Mark 1 manual says that you can bleed the caps by unpluging the amp, turn power on plug in guitar and play for a few a few minutes with stand by off. Call Mesa to check.