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Dirty-South Blues Harp forum: wail on! >
Magnatone Varsity M-197-3-V Makes Fart Sounds
Magnatone Varsity M-197-3-V Makes Fart Sounds
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Georgia Blues
256 posts
Jan 22, 2019
8:29 AM
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OK, I just got this thing and thought I might have had a bad speaker. Now I'm not sure what is going on. I first noticed my amp farting when I would hit a particular note. Generally it sounds very good.... BUT if I gently tap any part of the chassis, a tube, speaker frame or case with say a pencil,it makes this braaaapy sort of fart sound.
Any ideas appreciated.
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dougharps
1891 posts
Jan 22, 2019
8:38 AM
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I am not an amp tech...
IMHO
Perhaps a tube has become microphonic?
With the amp off for a few minutes and unplugged, I would remove and reseat each tube 2 or 3 times, just in case there is oxidation on the pins or sockets.
Generally if a tube picks up a resonant frequency or responds to a gentle tap, it is microphonic and needs replacement.
Hopefully an amp tech will chime in?
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Doug S.
Last Edited by dougharps on Jan 22, 2019 8:41 AM
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Harpaholic
931 posts
Jan 22, 2019
1:00 PM
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Doug is on the right track. Could be any number of things. Speaker, tubes, poor connection, or a defective component.
Try a different speaker first.
Check for microphonic tubes by cranking amp without anything plugged in.
Tap gently on tubes with a pencil or chopstick to test for micrphonics.
If those two check ok you can try a chopstick test on all of the electronic/electrical components with the amp on, cranked up with nothing plugged in.
CAUTION!!
It's can be dangerous!!
It's similar to a the microphonic tube test except your tapping all of the components to find a bad connection.
Caps and resistors can be microphonic.
Watch a YouTube video on chopstick test assuming there available if you not familiar with the process.
FYI, I am not an amp tech, more of an intermediate.
Last Edited by Harpaholic on Jan 23, 2019 7:12 AM
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nacoran
10040 posts
Jan 24, 2019
11:11 AM
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That's not how you usually get a brown note is it?
Sorry, I know. Potty humor.
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Nate
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