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

[jim.thom jim.thom@telus.net]

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,
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

https://www.youtube.com/watch?v=QZJeHRXLxII