Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Esquirefreak on February 11, 2022, 01:00:55 pm

Title: 6G9-B Mystery (to me) cap
Post by: Esquirefreak on February 11, 2022, 01:00:55 pm

Ey!

What does the circled cap do? I get that it's some sort of bypass cap, and since it's only in the normal ch. I guess it's attenuating treble. But then again, I have no idea, hence the question.

Can someone explain how it works?

Kind regards,
Max Eriksson

Title: Re: 6G9-B Mystery (to me) cap
Post by: sluckey on February 11, 2022, 01:07:26 pm

That cap functions the same as a cap connected between plate and chassis ground, ie, it shunts high frequencies to ground. Yes, it actually shunts high frequencies to B+, but B+ is considered ground for AC signals due to the filter caps.

Title: Re: 6G9-B Mystery (to me) cap
Post by: Esquirefreak on February 11, 2022, 01:12:55 pm

Thanks for taking your time and exaplaining. Have a nice weekend!

/Max