The sunn Forum
0
  • October 23, 2018, 09:40:36 am
  • Welcome, Guest
Please login or register.

Login with username, password and session length
Advanced search  

News:

Welcome to the new home of The sunn Forum!

Author Topic: Concert Bass Mid control not working  (Read 376 times)

0 Members and 1 Guest are viewing this topic.

Hd0521

  • Jr. Member
  • **
  • Offline Offline
  • Posts: 2
Concert Bass Mid control not working
« on: October 24, 2017, 10:40:32 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 doesn’t change. If I dime either bass or treble the volume increases. I’m assuming it’s 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?

_peter

  • Full Member
  • ***
  • Offline Offline
  • Posts: 26
Re: Concert Bass Mid control not working
« Reply #1 on: October 25, 2017, 05:03:26 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