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Hi everybody. I own a mesa boogie prodigy and about a week ago starts making a crackling sound with all pots down. So i replace the power tubes, clean the sockets, but the noise it still there. i used to repair some solid state amps, but this is a little different. Can you guys give some tips...
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Welcome to the place.
This amp uses 2 driver tubes and 1 preamp tube.Originally posted by Simpson View Post
Did you check/clean the sockets of the driver tubes? I also assume that you set the bias when you replaced the outputs. -
Yes. I check the pre amp tubes, clean the sockets And set the bias to 120ma.Comment
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The last thing that I can suggest is to try changing the 3 12AX7 positions to see if there is any difference in the crackling.
I believe that because that amp is still being produced, there are no schematics available to non-authorized people. I guess that you can still try and contact Mesa to see if they will send you one, because the next step would be to start checking power supply components.Comment
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after resoldering the tube sockets and the plate resistors (they have made some kind of upgrade) the noise is almost gone.
Thank you for your reply!Comment
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