Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: pbman1953 on February 18, 2021, 10:23:01 am

Title: Lost my bass control
Post by: pbman1953 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

Title: Re: Lost my bass control
Post by: acheld 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.

Title: Re: Lost my bass control
Post by: sluckey on February 18, 2021, 10:30:14 am

No. But you may have accidentally boogered something while installing that 80µF cap.

Title: Re: Lost my bass control
Post by: pbman1953 on February 18, 2021, 10:39:52 am

The connections seem ok. Would anything else not work right? Besides the bass all works fine

Title: Re: Lost my bass control
Post by: shooter 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

Title: Re: Lost my bass control
Post by: pbman1953 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.

Title: Re: Lost my bass control
Post by: pbman1953 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!!