Hi,
A few months ago (Oct 2022), i buy in Reverb a Marshall Valvestate Bi Chorus 8280 and when i turn on, all feels ok, but one day i note only work one speaker. I change the cables and the other speaker are fine and i think the problem was in the output jack.
Finally, i found a tech who tell me he can check it and repair. When the amp is ready to go, i pay and check it in their local store and i notice a weak sound, but i thinked it was the room. The L and R speakers out works now but the problem comes when i push the chorus and the volume rise and have more body.
The guy tell me is because the amp only works in stereo when chorus is on (great sound and body), and in mono (sound lack and low volumen) when put off, but i don't believe it and that's why I'm looking for an answer here.
P.D. When i receive the amp, the first thing i do, is change the valve, so this is not the problem. If i disconected one speaker (L or R), sounds good and the chorus doesn´t affect the tone.
Please help me.
Try to switch a phase of the repaired speaker. There is a solderless connection, so you can do it yourself.
Jacek, you're amazing! The problem was in the connection of a speaker and generated opposite phase. The negative wire was in the positive and when i changed it, the problem was solved. Thank you very much, my friend!
