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Post by trevenarj on Jun 11, 2018 20:47:30 GMT -7
I am the second owner of a Maz 8 manufactured in March 2012. It is outstanding. I recently replaced all the tubes with the recommended set from The Tube Store (as suggested on the Dr. Z site) after I was getting a crackling noise from a preamp tube. Tonight I am hearing an odd sound as if the note from my guitar is “warbly”, almost like a chorus pedal is on. Bad power tube? Could a capacitor be leaking this soon and cause this? Opinions deeply appreciated.
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Post by "Z" Steve on Jun 11, 2018 21:02:00 GMT -7
I'm not much help re the caps, but you may try replacing the new tubes with the old ones, then put the new tubes back in one at a time to see if that brings the issue back ( unless the issue is there with both sets of tubes). This would be a quick way to rule out a tube problem.
Welcome to the forum as well!!
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Post by DRZ on Jun 12, 2018 2:54:12 GMT -7
+1000
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Post by doctorice on Jun 12, 2018 5:24:35 GMT -7
Doing the tube swap per Steve's post is the place to start.
Question: Is the odd sound coming on all notes, or is it just on specific notes? If the latter, it may be something other than a bad tube.
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Post by trevenarj on Jun 12, 2018 5:47:31 GMT -7
All notes. Will try the tube swap.
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Post by trevenarj on Jun 12, 2018 9:17:39 GMT -7
Are odds on power tube or preamp?
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Post by purpletele on Jun 12, 2018 9:41:48 GMT -7
Are odds on power tube or preamp? My recent experience places Warbler as a power tube issue, possibly the rectifier.
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Post by trevenarj on Jun 12, 2018 12:46:13 GMT -7
Thanks. I didn’t change the rectifier tube when I replaced the others. A friend has a tube tester. Will that be sufficient? It wouldn’t be able to detect microphonics or vibration issues, right?
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Post by "Z" Steve on Jun 12, 2018 13:02:31 GMT -7
To check for a microphonic tube you can tap the tube with a pencil while the amp is on and off standby (low volume suggested). It will be very evident if the tube is microphonic by the noise it makes compared to the others - more of a static/crackling noise. Also, take some DeOxit or any other contact/oxidation cleaner and spray the pins of each tube before reinserting them. Once sprayed just reinsert the tube a few times just to clean and remove any oxidation that may have built up over the life of the amp. You can use the DeOxit on your pedal in and out inputs as well as any other electrical component that may be oxidized or dirty.
Best of luck!
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Post by purpletele on Jun 12, 2018 13:14:00 GMT -7
Thanks. I didn’t change the rectifier tube when I replaced the others. A friend has a tube tester. Will that be sufficient? It wouldn’t be able to detect microphonics or vibration issues, right? Trevenarj, I would order a rectifier and get it in motion regardless of the test. Also, buy a few fuses to be safe. If it's the rectifier it may just not turn on after you shut it down. If it's the power tube, then it can cause an event that would take out a fuse and most likely the rectifier. I am putting my money on the rectifier going bad if it's sounding drunk.
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