[TCML] "And Speaking of Large Class C Power Oscillators..."

[sparktron01@xxxxxxxxxxx]

I have ordered a technical document for a very large "super power" 
vacuum tube power oscillator used for induction heating of gases 
for NASA at Arnold Engineering Development Center in the early 
to mid 1970s . 

http://oai.dtic.mil/oai/oai?verb=getRecord&metadataPrefix=html&identifier=ADA023067 

What is interesting about this unit is it is tunable from 10-50kHz, is 
vacuum tube powered (oscillator wired push pull parallel -- 
4 push pull units running in tandem ==8^O), and has a continuous 
rated output of 3.2MW (3,200kW). 

Detailed discussion of design, auxiliary equipment, 
and protective systems. AFAIK this is one of the largest VT power 
oscillators that I am aware. Very intrigued about electrical grid protection, 
protective relaying, and control methodology. This early I doubt that 
PLC's were used for controlling means (5TI Texas Instrument 
first generation PLC's did not become commercially available 
until 1975-1976 time frame), so probably discrete relays and 
possibly TTL or CMOS high speed controls. 

Alex Tajnsek has 4 or 5 Amperex 6960 water cooled triodes with 
complete HV and water jacket hardware out of 4-5 Lepel VT single 
ended 10kW induction heaters that we demo'd from the Richmond 
yard; so lots of this information will be used. Yep, we do have the 
hardware to build a push-pull high power VTTC. 

Regards 
Dave Sharpe, TCBOR/HEAS 
Chesterfield, VA. USA 
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