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[Amps] 4CX15,000A / 8281, Grid driven 80-10M PA 100% duty cycle

Subject: [Amps] 4CX15,000A / 8281, Grid driven 80-10M PA 100% duty cycle
From: "jim.thom" <>
Date: Sat, 1 Oct 2022 07:39:01 -0700
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4CX-15,000A / 8281 Grid driven 80-10M PA.

Originally it had a 4CX-10,000 tube in it, running 5 kw output. With the
bigger tube installed, a myriad of changes had to be done. Myself and Scott
spent hours on end pouring through the oem schematics. I had to come up
with new values, when the bigger tube is used. It has grid and screen over
current protection, plate over current, loss of B+ and screen voltage
protection, loss of airflow protection, below a specified threshold, etc,

Modified from 3 phase to single phase. The input circuit was re-designed,
then toss in the neutralization scheme used. 3 x EBM Papst blower's used.
Deluxe Magnehelic gauge used, that includes low and high pressure alarm
outputs. New screen supply installed, with higher screen V used. A 5 Vdc @
200 amp SMPS switching supply was modified to provide 6.2 Vdc @ 160 amps
CCS. There is still a lot to be done, and currently it is a work in
progress. New custom designed and built  plate xfmr is rated for 75 kva
CCS...and weighs 900 lbs...and is immersed in xfmr oil.
Enjoy the Video. Later..... Jim VE7RF
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