To: | amps@contesting.com |
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Subject: | [Amps] Surge resistor |
From: | "Rick Stealey" <rstealey@hotmail.com> |
Date: | Wed, 21 Mar 2007 13:22:47 +0000 |
List-post: | <mailto:amps@contesting.com> |
Tom, W8JI, says:
The small glitch resistors in your amp don't do a darned thing I am in the process of finishing up my 8877 amp, and the plans I am using show a 0.6 ohm 1 watter and a 50 ohm 50 watter in series. So in the event of a flashover (milliseconds ?) the 0.5 ohmer is supposed to blow open? I can't see the value of the 50 watter. In case of extremely high plate current, such as hitting it with full drive and no load, say 2 amps of plate current flows and even then the big resistor only drops 100 volts, and heats up 200 watts. I wouldn't expect a wirewound power resistor to fail immediately under these circumstances, and I can't see how it is protecting anything. What am I missing here? Is the 50 watter the wrong type? I have other topics to discuss relating to control circuitry, soon. Rick K2XT _________________________________________________________________ Live Search Maps ? find all the local information you need, right when you need it. http://maps.live.com/?icid=hmtag2&FORM=MGAC01 _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps |
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