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[AMPS] SB-220 B+ Resistor

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Subject: [AMPS] SB-220 B+ Resistor
From: (
Date: Tue, 2 Feb 1999 12:44:04 -0500

On Tue, 2 Feb 1999 12:08:00 -0500 "Walter Fairclough"
<> writes:
>I've read a lot on this subject but I'm still at odds as to what to 
>use in
>the SB-220 What's the best replacement for RFC2?  Should it be 10 ohms 
>2 10 ohms 10W in series or a 20 ohms 20 watts.

Anything is an improvement over nothing.
You ideally want a resistance that will limit arc/short current to a safe
level until the AC breakers pop. The resistor should be able to survive
without damage.

Using two in series is a suggestion to overcome the voltage breakdown of
a single unit but in truth I dont see it as a issue. The NCL-2000 used a
single resistor and I know of not a single failure in 35 years.

In an amp with more HV, series resistors would probably be a wise choice.

>All I can get in this neck of the woods is a Brown Devil 20 ohms 25W.
>Rather big. Is this acceptable?

Go for it. Not that big and there is plenty of room.

73  Carl  KM1H

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