So I've posted something like this before, but I think I've got a better video to show my issue. Maz 38NR crackling, hissing, popping and just generally being fussy. I'm under the suspicion that I might have a grounding issue. I've gone through gobs of tubes and I've had this issue for at least...a long time. I LOVE the way this amp sounds...my favorite amp ever...I don't want to use anything else, but I do want the issues to stop. Before I send it off to the good doctor, I thought I would see if anyone had any thoughts.
Also, any certified Z repair techs in Saint Louis?
Maz Sr. NR 2x12 Golds (MK II update + EQ Bypass) Z-Drive
Post by jkramsey1991 on Mar 27, 2017 8:06:55 GMT -7
My Monza used to make the whitenoise like you had but it turned out to be interference from something in the apartment below. I'm assuming since it has tape on it for mic placement you have taken the amp out of your house and tried it to eliminate that variable.
The popping with the pots is odd. Did you check to make sure they were tight to the chassis? Just something simple that might cause an issue.
As far as I know Doc has no certified techs all of his techs work in Cleveland with him so you would have to ship the chassis to him. A local tech might be able to figure it out but it's always best to send it back to the creator for strange issues. His rates are actually quite reasonable. The only part that sucks is the shipping.
Post by BritInvasion on Mar 27, 2017 9:35:39 GMT -7
In the vid with the chassis out , 2 things came to my mind: 1) With the chassis out , it's no longer connected to the ground / shield in the top of the cab. Just having the chassis screws loose can introduce noise / hum. 2) The noise when you turn the controls can be caused by the pots being a little loose. You might want to remove the knobs and snug up the hex nuts. *Do not overtighten* Just "snug".
Location: Valley Forge PA USA ...... Scene of the other British Invasion
First on the old amp with a plastic panel the pots do come loose and they are the path to ground for the CUT control. Just routine maintenance, once the chassis is out carefully remove the knobs one at a time. Then using a 7/16 nut driver CAREFULLY tighten the nuts . I always spray a little bit of pot cleaner between the pot and the chassis to insure good electrical connection prior to tightening .
Also in the future when trying to demo amp noise , do not have a guitar plugged in to amp, just common sense.
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