Major power loss on my Mark2B.

[domglop78]

hello
recently I have a major power loss on my amp. I checked the voltages of the power supply board and they are all good. I have to turn volume 1 all the way up to hear a slight overdriven sound.
I cleaned all the jacks and changed all the tubes (preamp and amp)
I even changed guitar and input jack.
anyone have an idea? I do not know what to do...

dom

 

[MK IIB]

Hi..One easy thing to try is putting a patch cable in the effetcs loop from the effects send into return.Sometimes these jacks can become corroded or dirty and cause problems like that..Certainly worth a try.
Have you tried it with a different speaker/cable?

 

[domglop78]

Hello
Thank you very much for your answer
I think I found the cause of the error...
the black wire on the loop return plug was unsoldered.
probably because of a collar that I had placed too close which forced it.
Since then everything has been working fine.
You see the solution you mentioned corresponds exactly to the failure observed.

sincerly
dom

 

[MK IIB]

Glad you got it sorted out.

 

[Boogiebabies]

hello
recently I have a major power loss on my amp. I checked the voltages of the power supply board and they are all good. I have to turn volume 1 all the way up to hear a slight overdriven sound.
I cleaned all the jacks and changed all the tubes (preamp and amp)
I even changed guitar and input jack.
anyone have an idea? I do not know what to do...

dom

Good Catch!!!