4-1000A grid driven transmitter layout

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N4LTA:
I have finally got most of the parts together for a 4-1000A transmitter. I plan to run the tube at 3000 volts. The power supply will have a variac and I can go up to probably 3500 volts. I plan to use a stout 400-500 volt screen supply also with a variac. I mostly will run it on 80 meters but will build it for 160 and 40 also. Plan to use a pi net with vacuum caps. Probably wind the inductor with 1/4" copper tubing. I want it to just loaf along at the legal limit.

What I am most worried about with a grid driven final is stability and neutralization and also layout.

Does anyone have a layout of a typical 4-1000A final. The grid circuit will be below chassis and the plate and pi net above chassis obviously but what else should I look out for. I understand that the 4-1000A will turn into an oscillator easily.

I have a 5" x 17" x 14" Hammond chassis for the RF deck. Anyone tried the QRO 60uF 4000 volt Russian filter capacitor?

Any tips will be appreciated. Thanks in advance.

Pat Bunn
N4LTA

The Slab Bacon:
Complete transmitter or just an amplifier? ? ? ?

N4LTA:
Amplifier - I will drive it with a seperate exciter.

Pat
N4LTA

The Slab Bacon:
Why not make it easy on yourself and make it grounded grid with a tuned input?? At 3500v it will be happy and be much easier to build / design? ?

N4LTA:
That is a good idea as it should be more stable. I had a 4-1000A that I ran on 160 meters years ago that put out about 2K watts with my IC551 running full bore.

Pat
N4LTA

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