[Amps] Surge resistor
Rick Stealey
rstealey at hotmail.com
Wed Mar 21 08:22:47 EST 2007
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
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