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  1. R

    Noisy JMC 800 Artist (2203)

    I am a radio/television service certificated man. And i have tried normal methodes to check the problems. I have checked for the voltages, loocked for bad soldering, change V1 and V2. I also disconnect the two inputs and ground the grid, but it is the same problems. I have also tested the 50 +...
  2. R

    Noisy JMC 800 Artist (2203)

    Hi. I am repairng guitar amplifiers and I have a problem with a JMC 800 (2203). The owner of the amplifier has short-circuited two pins on an output tube. There is sound at the amplifier, but there is a noise in the pre-amp, mostly at high input. There is no noise when the master volume is...
    • rbotn
    • Thread
    • 2203 repair noise short-circuited
    • Replies: 6
    • Forum: The Workbench
  3. R

    Noisy Marshall JMC 800 Lead (2203)

    Yes I have experience working on amps, but this is a tricky one. There is nothing to see trough visual inscctions. The voltage around V1 and V2 is whitin 10%. The noise is the same with or without cable in the inputs. Are there anybody who have bad experiences with the jack inputs? Thanx, I...
  4. R

    Noisy Marshall JMC 800 Lead (2203)

    I have change both preamp tubes with new one, no result. I sounds like the noise is comming for the high input. When I pull out V1, the first tube, the amp is silence.
  5. R

    Noisy Marshall JMC 800 Lead (2203)

    Hi. I am repairng guitar amplifiers and I have a problem with a JMC 800 (2203). The owner of the amplifier has short-circuited two pins on an output tube. There is sound at the amplifier, but there is a noise in the pre-amp, mostly at high input. There is no noise when the master volume is...
  6. R

    Hum in Marshall artiste 100 (2068)

    I have change all filter caps, bias is correct the valves are matched. And if I pull out V1 to 3 no differences. But if I pull out V4 the amp is silence. Maybe the hum is coming from the feedback into the grid on V4. No trafo changes as long as I can see.
  7. R

    Hum in Marshall artiste 100 (2068)

    Hum in Marshall Artiste 100 (2068) Hi. I am a service engineer who try to help a friend with a Marshall 2068 from 1972. The problem is that there is a HUM in the loudspeaker. The position of the volume controls has no influence. I am not shure if it is 50Hz or 100Hz hum. My friend told...
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