Mark III 80hz slider problem..

Pre Recto days. Boogie modified Fenders, Mark I-IV, Dual Calibers, etc

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Bottle Rocket
Posts: 1
Joined: Fri Feb 08, 2019 11:09 pm

Mark III 80hz slider problem..

Post by Ryanpeerson1 » Sat Feb 09, 2019 8:31 am

Ok so I’m the new owner of a black dot Mark III. The only issue that I’ve found is that when I engage the GEQ, the 80hz slider will emit a loud droning hum if it’s placed near the top line or the bottom line. It has a range in the middle where it works perfectly and sounds great, but moving it up or down too far will cause the issue. Like I said before, it’s a loud hum, and when I strum the guitar, no noise comes from the speakers other than the humming. Does this sound familiar? Any help or advice would be appreciated greatly.

Mark III
Posts: 194
Joined: Fri May 04, 2018 10:36 pm

Re: Mark III 80hz slider problem..

Post by woodbutcher65 » Sat Feb 09, 2019 8:35 am

The slider (linear potentiometer) probably needs to be replaced.

I'd recommend replacing all five at once.

Technician skills required.

Parts available from Mesa.

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