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Post by jukejointjimmy on Jan 26, 2022 18:55:01 GMT -7
My Maz 18 Reverb, which has been upgraded to Mk II circuitry, recently seemed to lose some output and started exhibiting some low ghost notes, especially in the upper registers. I have replaced the output tubes with a couple of different matched pairs, but that did not solve the issue. Before I head off to spend big $ with my trusted repair guy, just wondered if anyone has experienced similar issue or has an idea about the source of the problem? Thanks! Jimmy
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Post by nick0 on Jan 26, 2022 19:45:13 GMT -7
Did the factory do the update? If so reach out to Don. He's great! He'll get you sorted.
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Post by premiumplus (Dave) on Jan 27, 2022 6:26:02 GMT -7
Ghost notes are sometimes caused by the tone being played mixing with a hum or oscillation elsewhere in the amp, creating a harmonic that shouldn't be there. You might have a bad filter capacitor, or it could be a microphonic preamp tube.
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Post by jukejointjimmy on Jan 27, 2022 7:56:26 GMT -7
Have been in touch with Don, sent him some video clips and he gave me several options to look into, none of which solved it. Will try to swap out preamp tubes, if that fails, it’s off to repair man…
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Post by Chilly Gibbons (Todd T.) on Jan 27, 2022 7:57:34 GMT -7
Ghost notes are sometimes caused by the tone being played mixing with a hum or oscillation elsewhere in the amp, creating a harmonic that shouldn't be there. You might have a bad filter capacitor, or it could be a microphonic preamp tube. Agree with Dave (not surprising as he is a wealth of knowledge and extremely helpful (plus he’s an EE)), I would start at the preamp tubes, remove the covers, and lightly tap to see if you can induce a ringing sound. If so, that’s probably the culprit. Best of luck
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Post by doctorice on Jan 27, 2022 17:31:39 GMT -7
Can you say a bit more about what you call a "ghost note?" Does it happen everywhere on the fretboard, or does it only occur at certain notes?
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Post by jukejointjimmy on Jan 29, 2022 9:40:31 GMT -7
Can you say a bit more about what you call a "ghost note?" Does it happen everywhere on the fretboard, or does it only occur at certain notes? Pretty much everywhere, but certainly more pronounced in the upper register.
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Post by doctorice on Jan 29, 2022 10:55:02 GMT -7
Can you say a bit more about what you call a "ghost note?" Does it happen everywhere on the fretboard, or does it only occur at certain notes? Pretty much everywhere, but certainly more pronounced in the upper register. Okay. I thought you might be encountering a resonance issue that I've had on several amps. Tube dampers and clamps have solved that problem for me, but it seems something else is going on with your amp.
This may or may not be helpful, but what I did was to strike a note on the guitar and then grab, with a towel or kitchen mitt, each tube until I found the culprit. (I had the guitar on a stand with a capo so I could easily generate the notes that were causing problems.)
Good luck.
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