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RE: 6883B as a audio output tube

RCA intended the 6146 series for RF use, with audio ratings as well.
Note:
1. Low screen grid voltage rating: good for better efficiency in RF (class C or AB)
2. Short dimensions: less parasitic inductance, etc. extends frequency to VHF.
For many years, the typical ham hf SSB exciter used two 6146s in parallel into a pi-network for ballpark 100 W PEP.
See:
http://frank.pocnet.net/sheets/049/6/6146.pdf
Specifically, p 14 of 29:
"High power sensitivity
90 W CW Input (ICAS) up to 60 Mc
60 W CW Input (ICAS) up to 175 Mc"


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