Search results

  1. Volodymyr

    Marshall JCM 2000 DSL 50 gain loss troubleshooting

    The amp is for US voltage, I just measured the socket it shows 135 AC, It explains where the 7.+ volts on heaters cames from
  2. Volodymyr

    Marshall JCM 2000 DSL 50 gain loss troubleshooting

    The heater voltage for preamp tubes For v1 and v2 is 7.4 DC For the v3 and v4 7.3 AC the power tubes have no pin numbers and are hard to reach not shorting something, will try tomorrow one more time I uploaded a video with both channels, a creepy smartphone mic was unable to pick the lower...
  3. Volodymyr

    Marshall JCM 2000 DSL 50 gain loss troubleshooting

    I checked every soldering on the PCB, and unplugged and plug again every wire, but nothing really helped I suppose some capacitor or resistor has died but still looks new
  4. Volodymyr

    Marshall JCM 2000 DSL 50 gain loss troubleshooting

    For measuring plate voltage I used pint 6 and 1 to the ground For measuring cathode voltage I used pint 8 and 3 to the ground Then for getting the voltage between the plate-cathode, I used pins 6 to 8, and 1 to 3 for each tube For current, I used the exact same amper-meter, dial on a 20m...
  5. Volodymyr

    Marshall JCM 2000 DSL 50 gain loss troubleshooting

    I don't think this is a bias issue, I have checked bias is stable during a couple of hours of playing also, the green channel works as expected, so there is a problem somewhere on preamp side
  6. Volodymyr

    Marshall JCM 2000 DSL 50 gain loss troubleshooting

    Thanks The amps are 2005
  7. Volodymyr

    Marshall JCM 2000 DSL 50 gain loss troubleshooting

    Unfortunately found VERY good amp guy it's a lottery, I had a negative experience with some tech who created a mess of soldering in the amp and fixed nothing I used to fix all my previous amps by myself, but this one is much more complex than a single-channel one like Orange tiny terror I...
  8. Volodymyr

    Marshall JCM 2000 DSL 50 gain loss troubleshooting

    can anyone help?
  9. Volodymyr

    JCM 2000 DSL 50 has no gain on the red channel

    Cleaning up the sockets and tube pins doesn't helped
  10. Volodymyr

    Help With Dsl 50 (gut Shots Included)

    In my case, it sounds like a wah-wah pedal, with no lows at all, even a deep switch doesn't add low at much if the issue is the same, it might be because of lack of gain
  11. Volodymyr

    Marshall JCM 2000 DSL 50 gain loss troubleshooting

    Hi folks, I recently bought my first Marshall the JCM 2000 DSL 50. I have spent a few days, playing around with it, switching between channels and mods, trying to pool all possible sounds from it. Some moment, when I was playing on a red channel Lead 1, the gain suddenly disappeared, the...
  12. Volodymyr

    Help With Dsl 50 (gut Shots Included)

    I have the same issue, on my DSL 50, did you fix yours, what was the root cause?
  13. Volodymyr

    JCM 2000 DSL 50 has no gain on the red channel

    Good point about cleaning tube pins and sockets, I'll definitely try this
  14. Volodymyr

    JCM 2000 DSL 50 has no gain on the red channel

    To be more clear, I used one spare tube for testing, I put it in each position checking the result each time The only difference is the new tube is high gain one, it adds some gain but still does not fix the problem The red channel is supposed to be more hot-roaded than the green one, but in...
  15. Volodymyr

    JCM 2000 DSL 50 has no gain on the red channel

    I have Dimarzio PAF's 36th anniversary set on my guitar, it has pretty low output pickups, for Lead 1 I've used the Boss SD 1 just for volume booster, and a bit of an EQ correction
  16. Volodymyr

    JCM 2000 DSL 50 has no gain on the red channel

    Yes, this is the first that I did, I mixed them up, then put a new, high-gain one in the v2 - nothing really helped The result, is still the same, the lead 1/2 loss a gain, a bit of volume, and a lot of lows, it sounds like a wah-wah pedal
  17. Volodymyr

    JCM 2000 DSL 50 has no gain on the red channel

    Hi everyone, Recently I purchased my first Marshall amp, the JCM 2000 DSL 50 But my happiness didn't last long. A few days ago, something went wrong. I was playing on a bedroom level, a volume of about 2/2.5, a gain of 10, on a lead 1 red channel boosted by the Boss SD 1, suddenly all gain...

Latest posts



Top