Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Quatro on July 22, 2012, 07:11:07 pm

Title: bias pot rating
Post by: Quatro on July 22, 2012, 07:11:07 pm

how many watts is a typical bias pot rated for? Can a standard pot do the job in a pinch?

Title: Re: bias pot rating
Post by: PRR on July 22, 2012, 08:51:48 pm

Work out the voltage, resistance, power.

Since amps vary a LOT, from 15V to 65V bias and 250K to 10K pot, I'd hate to give an average answer if you have an extreme amp.

Title: Re: bias pot rating
Post by: Quatro on July 22, 2012, 09:09:43 pm

50v bias supply. 36k pot with in think 10k between it and the ground.

.06 watts?

Title: Re: bias pot rating
Post by: PRR on July 23, 2012, 09:58:19 pm

Something like that. And you can't find a pot smaller than 1/8W (0.125W). So any pot.

Title: Re: bias pot rating
Post by: Quatro on July 26, 2012, 12:30:44 pm

thanks prr. you are top drawer.