Marshall jmp 1H very low volume

[jerrydyer]

This thing is driving me crazy. Acts like bad O.T. had one so i swapped it. Same. Every single resistor is good. I have not checked every single cap. Just curious if there is already a known issue. I havent been here in a while. Im working for a service center that does repairs for so cal guitar centers. How you guys doin?

[Ritchie200]

Hey Jerry, good to see you back!

When you say acts like - Distorted output? No sound? Does the power mode switch still make a difference? Also check tension and clean speaker jack contacts.  I'm sure you did the tube wiggle to clean those up too.

Jim

[jerrydyer]

• The sound is good just low. And yes there is a slight change in hi and loe powervswitch