[Amps] GI-7B

[Ron Youvan]

> 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.