Recent content by opauly

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  1. O

    2:90 preamp loud hum

    Yes! I am sorry for the title, it is the power amp. The 2:90 stereo simulator.
  2. O

    2:90 preamp loud hum

    Any ideas?
  3. O

    2:90 preamp loud hum

    Hello! My 2:90 preamp is having a loud hum in channel A. Channel B does not have it. I already tested all tubes (with a tube tester) and all are fine. Hum goes away when guitar is unplugged, but in that case why is channel B not having that loud hum? Thanks!
  4. O

    Solo Head 50 low output

    Any ideas?
  5. O

    Solo Head 50 low output

    I checked all plate/screen voltages as you suggested and everything looks fine. The only thing I suspect is that plate voltage on V1a should be 186V but is providing 147V. Also its cathode pin 3 should provide 2V but is measuring 1V. I desoldered surrounding components and checked them and they...
  6. O

    Mark V 25 seems dead

    Well I am an EE and have worked with pedals, guitars and amps for a while now. But working with amps is always dangerous! Glad to know this forum is one of the best resources out there right now. Keep on rocking guys!
  7. O

    Mark V 25 seems dead

    It turns out that the output of the LM2940 was providing 0v, but the IC was OK. I desoldered that pin and the +12V supply was fine. Had to trace the problem to C54, a 15uF capacitor that went bad. Replaced it, and the amp is back! Thanks for the help!
  8. O

    Solo Head 50 low output

    Hello, My Solo Head 50 amp has very low output, specially in Lead channel. Tubes are OK, and already tried swapping them. The overall output is very weak considering it is a 50W amp! Bias is OK (around 20mA) and already tried checking plate and cathode resistors. I am going out of ideas! Also...
  9. O

    Rectoverb 25 crackling sounds

    Hello! My Rectoverb 25 combo is making some loud crackling noises, even with ALL controls down. All tubes are OK since I tested them with a tester and also tried with new ones, and the noise is always present does not matter the channel or configuration. Already tried many things but I am not...
  10. O

    Mark V 25 seems dead

    Hello! It turns out my Mark 5 25 head has no working front panel. All tubes are OK, power transformer is OK, fuse is OK, but there is no pilot light on and there is no sound. It is basically dead. Power tubes are being fed since they glow and get very hot, preamp tubes are not that hot but they...
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