Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: 12AX7 on January 07, 2012, 10:32:17 am

Title: Treble bleed cap value calculation?
Post by: 12AX7 on January 07, 2012, 10:32:17 am

Is there a way to calculate what value cap to use as a bleed on a volume control in a given circuit in order that the frequency curve remains as unchanged as possible throughout it's range? Also, when using a resistor in parallel to it to help keep the balance of lows from dipping, would you use a different value depending on the pot value? In guitars for exampl (tho i'm talking amp volume here) they always cite a 220k resistor, yet i never see them mention any other value even tho as many people use 500k pots as 250k.

Title: Re: Treble bleed cap value calculation?
Post by: PRR on January 07, 2012, 05:57:28 pm

? Is there a way to calculate what value cap to use as a bleed on a volume control in a given circuit in order that the frequency curve remains as unchanged as possible throughout it's range?

Yes.

But do you want to do tedious math or get on with life? Tack 50pF 100pF 200pF in place and listen.