SOURCE: marshall tube amp problems
There is a bridge rectifier and red and black wires jumping from preamp tube to preamp tube. These need to be resoldered, take it to your favorite pro audio service center. I'm doing this to the same amp right this minute! Send it to me, I'll fix it. Tom Peary Norman's Electronics Atlanta, Ga 770 451 5057 www.neiusa.com
SOURCE: Marshall jcm 2000 dsl 100 head not powering cabs 4/8ohm outs
Since you are getting some output, the amp section is probably OK. There are circuits designed to handle thge difference impedence outputs. This should be a relatively simple repair for any shop that handles these units. If you don't have one local to you, let me know and I'll locate the service info and get you more specifics.
Dan
SOURCE: I have a marshall 100w
Most 1960 cabs have an option for 8 or 16 ohm... i dont think there is a 4 ohm option. The Jcm 2000 heads have the ability to do all three ohm setting. Thats all you really have to worry about. Make sure the ohms match up. The 1960 cabs typically have 4 t-75 speakers in them which are 75 watts each so wattage is not a problem. There is some argument about what ohms sound best. It doesn't really change that much in the sound in my personal opinion. I run mine at 16 ohms though cause i think it sounds brighter...
SOURCE: hi i m sanjay i
there is a possibility of a shorted turn of the flyback transformer. To test. short B-E together on the horizontal output transistor and connect 60W globe across C-E. measure voltage across lamp - if it comes up to 135v then you have a short either in the horizontal circuit or secondary circuit off the flyback transformer or even the transformer itself.
SOURCE: Denon AVR2106 One output channel shorted and
I would also replace 2sa992 (2pcs) and 2sc1845 on preamp board- sometimes they look ok when you test them by regular meter. Check 1.2 kOm and 4.7ohm resistors at preamp pcb. Check diodes on output pcb (could be smd type, connected from base of output transistors to emitter i think)
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