I use a probable 750 pf variable
across the output from my ART-13 transmitter, it definitely has an affect when loading into a low (50-75 ohm) impedance non reactive antenna or dummy load.  Can get at least 100 watts out and normal SWR indications using a Heath HM-102 wattmeter/SWR meter.  4000
pf fixed shunt on output seems excessive. 

Chris, AJ1G Stonington CT.

Sent from my iPhone

On Mar 13, 2023, at 15:29, Mack McCormick <[email protected]> wrote:


Jeep,

Thank you very much for responding. I will give your settings a try and report back. My voltages from the power supply are almost identical to yours.

Mack
W4AX

On Mon, Mar 13, 2023 at 15:09 Jeep Platt <[email protected]> wrote:
I use a setting of 8 for 75 meters. The loading control (to the left side) has no genuine effect. I also use about 850pf of external loading. At 1250v B+, I read 120 watts into 50 ohms.  Other p.s. voltages are 400v and 27.5v.
 Jeep K3HVG

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