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Re: [Amps] Need some 220K 2 watt carbon resistors

To: Amps@contesting.com
Subject: Re: [Amps] Need some 220K 2 watt carbon resistors
From: jkearman@att.net (Jim Kearman)
Date: Mon, 27 Mar 2006 16:31:46 +0000
List-post: <mailto:amps@contesting.com>
From: John Popelish <jpopelish@rica.net>

> But high resistance value comp resistors don't do 
> as well as low value ones, because of the high peak voltage applied to 
> produce high peak power in a high value resistor.  You get voltage 
> break down problems, instead of peak power problems.

This is worth restating for first-time amp builders: Check the break-down 
voltage rating of the resistors you plan to use for bleeders. Most resistors 
capable of dissipating the wattage will withstand 400 V, but read the 
datasheets. Surplus components with unknown specs are a big risk. You 
definitely want some headroom for components that get hot, and that are 
installed in a confined space. A HVPS is not the place to cut corners. 

73,

Jim, KR1S
http://kr1s.kearman.com/
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