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Author Topic: QRO WITHOUT DC????  (Read 686 times)
N9LCD
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Posts: 182




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« on: December 18, 2011, 03:45:03 PM »

I was looking over my RCA Tube Handbook, the five volume set.  I noticed that some of the data sheets (from the '50's & '60's) for very large, high-power transmitting tubes list data for the tubes used under some rather unusual conditions:

     SELF-RECTIFYING CLASS C OSCILLATOR OR POWER AMPLIFIER

     WITH SEPARATE, UNFILTERED, SINGLE-PHASE, FULL-WAVE POWER SUPPLY

Why would somebody run their output stage with anything else than fully filtered DC on the plate(s)?

What mode(s) could you run with unfiltered HV to the output stage?  About the only mode I can imagine is CW and then only in an emergency.

N9LCD

 Huh
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W5FYI
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Posts: 1046




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« Reply #1 on: December 18, 2011, 05:45:26 PM »

Radio is not the only domain for vacuum tubes; they are/were also used in industrial and medical settings, too. Induction heating and welding applications, metal purification, x-ray applications, etc. Some of those applications require pretty high operating power, but don't necessarily need filtering. (Just my 2ยข guess).
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