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In Reply to: RE: 6883B as a audio output tube posted by Freo-1 on April 09, 2015 at 13:34:11
6146 was RCA's failure to understand the market. They thought it could compare and hold i-ts own against the KT-88/6550 but it was too expensive for the mass marketers, Same with the 7027.
IIRC, the Greatfull Dead, towards the end, used amps running the big Dyna Transformers (a-440/441, the stuff for the Mk VI's) and using the 6146 Good luck
Follow Ups:
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"
Here is a link which covers the redesign on the 6146B/6883B over the original 6146:
"What this country needs is a good 5 watt amplifier!" (Paul Klipsch)
Interesting. Thanks for the feedback.
These days, the price of 6883B's are very reasonable, and seem to be readily available. So far, they seem to provide a excellent sonic presentation. Using a pair of 6BL7's as the driver/phase splitter, the 6883B's really sound great. Outstanding clarity, low level detail, excellent bass, and very linear.
"What this country needs is a good 5 watt amplifier!" (Paul Klipsch)
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