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Hoffman Amps Forum image Author Topic: Lost my bass control  (Read 1901 times)

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Offline pbman1953

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Lost my bass control
« on: February 18, 2021, 10:23:01 am »
Recently, in my Sunn 2000s, I installed a 80Mf cap on the C line from the filter section. Now I notice that my Bass Control does nothing. Are they related?




https://el34world.com/charts/Schematics/files/Sunn/Sunn_2000s.pdf

Offline acheld

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Re: Lost my bass control
« Reply #1 on: February 18, 2021, 10:28:17 am »
Curious as to why such a large cap in the C node . . .

Looking at the schematic, the two should not be related.

Offline sluckey

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Re: Lost my bass control
« Reply #2 on: February 18, 2021, 10:30:14 am »
No. But you may have accidentally boogered something while installing that 80µF cap.
A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

Offline pbman1953

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Re: Lost my bass control
« Reply #3 on: February 18, 2021, 10:39:52 am »
The connections seem ok. Would anything else not work right? Besides the bass all works fine

Offline shooter

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Re: Lost my bass control
« Reply #4 on: February 18, 2021, 11:10:53 am »
I'm with Sluckey, "the last thing you did",  9outa10 in my career
other less possible;
did you mess with bass that much before cap swap?  You might be noticing because with the new cap you're playing with knobs that haven't been tested in awhile
Went Class C for efficiency

Offline pbman1953

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Re: Lost my bass control
« Reply #5 on: February 18, 2021, 11:26:11 am »
Before this , it was hit or miss with the bass control. It doesn't do much but it's nice to have if the bass boost is too strong.

Offline pbman1953

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Re: Lost my bass control
« Reply #6 on: February 18, 2021, 12:02:19 pm »
I got it back.  I found a ground and a couple connections that were questionable.


Thanks for the quick reply's!!

 


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