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Post by Deleted on Mar 6, 2008 13:31:45 GMT -7
Playing an overdrive pedal through a Maz 38 head, every time I step on the pedal to turn on the over drive it makes a thumping noise through the amp. I have used this pedal on a Fender Twin and a Maz Combo and have no trouble what soever. Just on the Maz Head. I emailed Dr Z about it and he suggested that I might try replacing the tubes in position 1 or 2. I replaced both of these and still the problems exist. Does anyone have any other ideas why this might be? Also I noticed that while my combo has a big fan to help cool the tubes the head does not. Does this result in tubes burning out faster in the head than the combo or will the amp break up a little sooner in the head or any other ill effects due to the head not having a fan?
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Post by benttop (Steve) on Mar 6, 2008 13:55:19 GMT -7
The head's tubes are sticking up instead of hanging down, so cooling is more efficient in the head configuration (heat flows away from chassis instead of toward it).
As far as the thump goes, I have no new ideas. Does it do it in both inputs? Have you tried a different cord between the pedal and the amp? Are you certain that it doesn't happen on other amps (ie., has something failed just as you switched to the Maz)? What about other pedals - do any others do the same thing with this amp?
Just trying to think of every possible thing that might contribute to such. See if you can whittle that down...
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Post by Nick G. on Mar 6, 2008 16:27:02 GMT -7
Closed back speaker cabinet?
I ran a Stang Ray through a 4x12 cab with Greenbacks. Every time I stepped on a distortion pedal, I got this massive low-end resonance that vibrated the cab's back panel and made the sound you're describing.
I went to the Wal-Mart craft section, bought a roll of quilt batting, and stapled-gunned that stuff to the inside of the back panel. Helped quite a bit.
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Post by Lefty on Mar 6, 2008 18:50:06 GMT -7
Try putting another pedal between the amp and problematic pedal. I've had some do that. Could be an impedance issue.
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Post by Deleted on Mar 6, 2008 19:55:13 GMT -7
Try putting another pedal between the amp and problematic pedal. I've had some do that. Could be an impedance issue. I think that worked. Because I found this phenomenon while only connecting an overdrive pedal so all of my testing was with just the overdrive pedal. When I hooked up my complete pedal board with my keely compressor infront of the overdrive pedal the problem seems to be solved.
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