> The tube will run at that voltage (it's pulse rated at something like 7KV or
> whatever so the problem of internal arc should not be the factor), but in my
> evaluation of a pair running from 1800v - 3100v, the "sweet spot" of
> efficiency is around 2500-2650. I'm not sure why, but voltages much above
> this the tube efficiency seems to drop. And in my application (RTTY
> mostly), efficiency is the name of the game because you only have 700w of
> total Pd.
/*snip*/
>> GI-7B just a question about what the true limit of plate voltage is??
Increasing the plate Voltage allows a tube/s to produce more RF power, (once
you reach the
current limit of the tube) within limits.
My experience with high power transmitting tubes (IOT-D2100) is; the tube
runs cooler and lasts
longer at the lowest supply Voltage that the tube can make the required power.
Higher Voltage at a lower current means the tube is operating at a higher
average resistance,
resulting in a greater IR drop across the tube. Dropping the power dissipated
in the tube
increasing the overall efficiency.
--
Ron KA4INM - The only real problem is death is so final.
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