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previous: Man o'Blues I'm curious as to why you chose ... -- 11/18/2003 4:45 PM	View Thread

Re: Heat Sinking Tips Needed

11/18/2003 8:24 PM
CraigR	Re: Heat Sinking Tips Needed I agree that the 100R value gives a nice subtle compression when the amp is cranked. I have used values up to 200R, but 100R is a keeper. BTW, one way to lower the heat produced in a single resistor is to use more than one. You can use one or more per leg of the PT secondary, before the rectifier junction. That way the individual/pairs of resistors see only half wave rectified DC. It would look like, "rectifier -> resistor (or resistor pair) -> rectifier -> junction" on both sides of the secondary. You could try two 200R 5W resistors in parallel per leg. That would distribute your waste heat a little more, while still giving you the protection of the 20 watt aggregate rating. Lots of tricks, (if you have the room)! Cheers, Craig

11/18/2003 8:24 PM

CraigR

Re: Heat Sinking Tips Needed

I agree that the 100R value gives a nice subtle compression when the amp is cranked. I have used values up to 200R, but 100R is a keeper.

BTW, one way to lower the heat produced in a single resistor is to use more than one. You can use one or more per leg of the PT secondary, before the rectifier junction. That way the individual/pairs of resistors see only half wave rectified DC.

It would look like, "rectifier -> resistor (or resistor pair) -> rectifier -> junction" on both sides of the secondary.

You could try two 200R 5W resistors in parallel per leg. That would distribute your waste heat a little more, while still giving you the protection of the 20 watt aggregate rating.

Lots of tricks, (if you have the room)!

Cheers,

Craig

Replies:

Man o'Blues I don't have room to add more resis... -- 11/18/2003 10:19 PM