AndrewButler

Ok, here's the issue...

I have a JCM800 2203 head and a JCM900 1960A cabinet.

When I set the head to the 16ohm output and plug it into the 16ohm side of the cabinet, all 4 speakers work fine.

When I set the output to 4ohms and plug it into the 4ohm side of the cabinet, only the 2 speakers on the right work.

Any ideas on what's wrong here?

Thanks for any help!

Jesstaa

Isn't that just it being in Stereo mode? T

__________________

AndrewButler

No, it is still set on mono mode. All 4 speakers should be working, but they are not.

HAMPAMP TUBE AMP SERVICES

It's got to be the a jack or bad solder connections. Check to see if the shorting contacts on the 16 ohm jack are returning to the closed position with nothing plugged in, try cleaning the jacks with contact cleaner, look for bad solder connections where the jacks are mounted to the board.

__________________
Pie are not squared, Pie are round

Due to inflation, I can no longer afford to put in my 2 cents worth.


'81 Gibson SG jr
'97 Gibson SG Special
'82 Gibson Explorer
'63 Fender Strat
'00 Fender Strat
'76 Ibanez Doubleneck (Gibson copy)
'08 PRS Paul Allender
Kramer (parts box) V
Peavey Vandenburg (parts box)
Marshall 1959
Marshall VS100R
Marshall 1960/A x 2
Line 6 Flextone III
Peavey Triumph 60
Gibson GA-5
Danelectro Cadet Model 122