Marshall head playing tricks on me

  • Thread starter Thread starter karambos2
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karambos2

karambos2

New member
Hi,

I've got a Marshall head called "100 watt lead and bass" with a gold coloured front. Model number: 2195; voltage: 120/240; frequency 40/60~; watts: 190. I don't know if it's a valve amp or not but when I opened it up there were these two blue cylinder things about two inches tall and about an inch wide. I don't know if they are valves or not but it takes about 10 seconds to warm up before you can play through it. I acquired the amp in England and it had an english plug on it but I live in Germany where my studio is and I've changed the plug. The amp works if you plug a guitar direct into it (i.e. without going through any pedals and effects).

Nonetheless, I've got a problem with it. I've recently been and bought a DOD power supply to power my foot pedals. When I power the foot pedals with batteries, plug my guitar into the pedals and output to the amp, everything's fine. I get a sound and I get the effect. If I use my J-Station (guitar effects prcessor) I also get sound and the required effects. However, if I use the DOD power supply to power the pedals, I get no sound and of course, no effect although the LED's light up on the pedals.

So I took the power supply back to the shop together with my pedals and asked them to check it out. So he plugged everything in - the power supply, my leads, my pedals, a different amp and a different guitar and they all worked fine. I got sound and I got effect.

Just guitar and amp - fine
Guitar, battery-powered pedals, amp - fine
Guitar, effects processor, amp - fine

BUT

Guitar, pedals powered with new supply box, amp - not fine

although the power supply works, the pedals work, the amp works and the guitar works.

Can anyone give me any hints as to what the F is going on? I'm tearing my hair out.

Many thanks

Karambos
 
it's a transistor amp

Hi,

I looked around all day today on the net and found this information:

"2195 JMP Lead & Bass, 100W head 100W cabinet
This amp (and cabinet) was in production from 1976 up to 1980. It was an all transistor Master Volume amp."

I found this info, together with a schematics diagram there. However, I still don't know what could possibly be wrong with it.

I'm grateful for further help

Karambos
 
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