Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: shooter on November 26, 2016, 07:42:53 pm

Title: doing math ?
Post by: shooter on November 26, 2016, 07:42:53 pm

Using 2 balance R's on series caps, + acts as bleeder.  2 150k in series, tied to caps, B+ ~ 500vdc.

I'm using V-squared / 300,000, coming up with .83W, doubling, (for good measure) ~2W?

thanks, ya slap me again, just don't want unwanted smoke:)

Title: Re: doing math ?
Post by: sluckey on November 26, 2016, 07:57:24 pm

.83 watts is the total power for both resistors. Each individual resistor only dissipates .42 watts, so you really only need to use 1 watt resistors for safety.

Fender was fond of 220K/1W balance/bleeder resistors.

Title: Re: doing math ?
Post by: PRR on November 26, 2016, 09:03:07 pm

> don't want unwanted smoke:)

Smoke is learning.

Title: Re: doing math ?
Post by: shooter on November 27, 2016, 06:12:59 am

thanks guys, I don't mind a smoke now n then, but this aint mine so....no smoke please :laugh:

Title: Re: doing math ?
Post by: drgonzonm on November 27, 2016, 01:56:22 pm

Use two watts just to be safe.   I can see a case where one ties the R in series with the caps, and there is a node where two Rs and two Cs are wired together.  Resistance then be comes a function of frequency, and one must use complex numbers to do the math.   :sad2: