Author Topic: Concert Bass Mid control not working  (Read 35 times)

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Offline Hd0521

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Concert Bass Mid control not working
« on: October 24, 2017, 09:40:32 pm »
With the mids dimed and the bass and treble at zero there is a very low volume tone coming through. If I back the mids down to zero the volume of that tone doesnít change. If I dime either bass or treble the volume increases. Iím assuming itís a passive Eq stack. I opened the amp up and it looks like the original pots wired right to the board. Any solution before having the pot replaced?

Offline _peter

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Re: Concert Bass Mid control not working
« Reply #1 on: October 25, 2017, 04:03:26 am »
Hi,

according to this schematic: https://schematicheaven.net/newamps/sunn_concertbass.pdf
the bass pot isn't stacked on the mids pot as in the usual fender/marshall tonestacks.
With bass at zero, the signal at the mids pot is shorted to ground. Therefor the mids pot can't work in this situation.

Cheers,
Peter