Not my experience with 4-1000A's. At 3KV they take a lot of drive
and fairly close to what
Bill Orr stated in his article on Tetrodes used in grounded grid amplifiers
(about 170 watts) but at 5 or more KV
it is less than 70 watts for full output and about 50 for full gallon (1500
watts).
Also a 1KVA variac is small not only due to the fact that the plate input
power for 1500watts output CW would be
over 2KW but that the current drawn by the power supply is many times the
RMS value for a Capacitive input filter.
Not so much a problem with a inductive input filter.
73
Bill wa4lav
At 07:39 PM 4/3/01 +0200, Wynand van Wyk wrote:
>Sam, can you put your hands on a VARIAC @ 1000VA (10A).
>
>I use Variacs on all my home built power supplies. That will give you 100V
>up to whatever you can get out of the supply.
>
>You can even then not use a soft start circuit but if you are as impatience
>as me when the DX calls, you better off with a soft start circuit.
>
>In my experience you need minimum 2700 Volts (100 watts driving) up to
>maximum of 3500 Volts ( 60 watts driving) in grounded grid with 4-1000A.
>
>That should give 2 kilowatt PEP.
>
>Why do you want to use 6 or 7 kilovolts ?
>
>Good luck with the project.
>
>
>73
>
>
>Wynand
>ZS6ARF
>
>
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