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  1. R

    Mesa 50/50 Problems

    Hi: maybe this http://forum.grailtone.com/viewtopic.php?f=5&t=26600 applies to you as well.
  2. R

    50/50 Hum

    thank you for your help. My problem deals with something arround the ground connections of the input B connectors.
  3. R

    50/50 Hum

    Hello: i am going through several problems with my 50/50 amp. One of the problems is that when i connect something in the B input it makes a huge hum noise even with the volume set to zero. When i try to open it with the amp still on it makes noises, this means that there is a ground wire with...
  4. R

    Diagnosis for a second hand 50/50 power amp

    Crane or any other, i need your help: I have done the mod for rebiasing the 50/50 (http://forum.grailtone.com/viewtopic.php?f=5&t=32130 ). I was trying to see the difference in the output waveform in both output channels measuring with a scope but as i was touching cables inside the amp...
  5. R

    Bias mod on a 50/50 : how to do

    Hi Crane: i also modified the bias current of my amp. I didn't have a tube socket so i put a 1 ohm resistor between pin 8 of the socket and its black cable. My plate voltage was 454 V and the current for the fixed bias was 13.2 mA. I modified the circuit and installed a 22kohm pot in series...
  6. R

    Bias mod on a 50/50 : how to do

    Maybe your amp is newer than mine . Thanks again, Crane.
  7. R

    Bias mod on a 50/50 : how to do

    35 mA to 45 mA is not enough to justify the bias intensity...maybe it's because the initial peak intensity when switching on or off. Could you answer me why your amp has that silver colour transformer (close the output jacks) and mine doesn't have it. thanks again.
  8. R

    Bias mod on a 50/50 : how to do

    hello again: did you use a cermet pot? do you recomend installing one of those over a normal one? thanks again
  9. R

    Diagnosis for a second hand 50/50 power amp

    thanks for replying. Mine is 220v too, so i don't know why your amp has 1 transformer more than mine. Your output transformers have the same label as my mesa boogie transformer? Good to know about the four capacitors replaced. I haven't played enough yet to say if there's hum or cracks. Any...
  10. R

    Bias mod on a 50/50 : how to do

    I want to thank you for this post. It will be very useful for me. I want to invite you to participate in my post, please visit http://forum.grailtone.com/viewtopic.php?f=5&t=32954 to help me. Thanks
  11. R

    Diagnosis for a second hand 50/50 power amp

    Hello: This is my first post here. First of all i want to thank "crane" and his post (http://forum.grailtone.com/viewtopic.php?f=5&t=32130) I think it's a great and usable mod i was looking for and opened my eyes to what i'm about to tell you. I have just bought a second hand 50/50 power amp...
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