ORIGINAL MESSAGE:
At 08:13 AM 1/30/2006, Partain, Chuck wrote:
>>OK, getting into this more and more every day and learning. Looking
>>at some designs on this GU-84b
>>amp, I see a lot if not most of the cathodes have resistance, some
>>a lot(30k) some little (.7) to ground.
>>The screen grid and control grids are not grounded and have
>>respectively ~350 and -150v on them.
>>
>>Why wouldn't it just essentially go to ground? what does the R do in series?
>>
>>thanks as always.
>>
>>KA1MWP
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
That design is a little unusual. Cathodes do not usually have an
inductor in series with the ground lead and a resistor paralleled
with that. Otherwise it appears to be a conventional "passive grid"
circuit. I'd suggest contacting NI4L and asking him.
73, Bill W6WRT
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