Quoting Jim Garland <4cx250b@miamioh.edu>:
That's going to be quite a resistor, inasmuch as 4KV across a 30 ohm
resistor amounts to a half million watts of dissipation! A 4KV pulse 50uS
wide, once per second, would dissipate 25W.
73,
Jim W8ZR
The resistor isn't to ground..... it's in series with the tube(s) that
may draw 1 amp intermittently ... therefore 1 amp squared through 30
ohms is 30 watts.
If the tube draws more amps ... a short or a bad load... maybe a two
amp spike... that is 120 watts which will hopefully burn out the
resistor
( acting like a fuse ) before the transformer or diode stack goes up in smoke.
Don W4DNR
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