Gary Schafer wrote:

A bridge or single ended type grid tank circuit will work with a
tetrode but the triode needs the balanced circuit in order to get
enough feed back.

I have a balanced input. It happens to be a toroid but I started with a
coil and two gang cap.

I got off on a tangent when I removed the tube so I now understand what
happened there.

My question really was looking for how much is enough? All the old books
say when the final does not effect the grid drive, it is neutralized but
everyone has a scope these days and it is so easy to hook it to the
output and measure the exact feed through.

I was looking for a number and I believe someone said 10 DB down from
input if the amp has 10 DB gain, so I guess I got the answer.

I am not quite sure how to translate this to volts at the output. Or
can I put in ten watts and only see the needle twitch on a 30 Watt FS
wattmeter at the output and consider it done?

js


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