MarkAren wrote:

Grid stoppers: A low value resistor (100 ohms) attached directly
between G2 and the screen supply to reduce the incidental Q of
circuit.

OK but the supply is a 12K resistor from the plate supply. Guess I
don't see what a 100 in series with this would do.

Same applies to G1.

Where does that go? There is a 47K grid leak going through the meter to
ground and a coupling cap from the driver.

So what is this grid stopper supposed to do?

APC - Anti Parasitic Choke.

Roger. The A caused a brain cramp. I have one in there.


Get a 1960s copy of the ARRL handbook and read up on HF amplifier
construction techniques. There has been plenty written.

I have 49, 57, 61 and 73 one of which I take to bed with me every night.

js

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