In Reply to: Low Voltage 811A? posted by Triode_Kingdom on January 6, 2015 at 08:08:05:
That would be the WAVAC "Music Dandy".From Nobu Shishido-- Japan.
The 811A required a power pentode to drive it-- he used a 6L6GC, or other similar, such as KT-88, EL-34, etc.
He ran 450 plate volts on the 811A plate, about 80-85 ma., and it was reverse-transformer (step-down) coupled-driven. The output transformer was conventional-- nothing fancy-- you could run about 4-to-5K.
Of course, I owned one. It was clean, fairly wide-band, lacked ultimate soundstage depth, somewhat scrambled together musical events (nowhere close-- as bad as nearly all other tube amps!), ate the tubes that drove the mid-stage power-driver for lunch every few weeks (what drove the 6L6, etc.). When healthy (new tubes!) it had 15 watts-- easily. The 811A never got stressed-- you could run it forever.
Of course, when I see something like this, I ask myself: "why not just run the 6L6 midstage right into an output transformer, and drive the speaker with that? Why add another stage"?
And there you are! One should try to be practical after all....
---Dennis---
Edits: 01/06/15 01/06/15
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Follow Ups
- RE: Low Voltage 811A? - tube wrangler 09:24:06 01/06/15 (1)
- Sounds like a DSP problem to me! - gusser 13:38:26 01/06/15 (0)