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In Reply to: RE: I use 300b with DC posted by jkalinow@hotmail.com on February 13, 2009 at 05:31:02
Hi John
Direct coupled or DC on the filaments (as per the reviewer's amp)? I am guessing direct coupled.
Cheers
Follow Ups:
I've never heard of a direct-coupled 300B.
Didn't think it could be done. Well, yes, if you use 3 stages (Fi), then yes. But not two.
The Lux is a 3-stage amp.
I could have sworn the Fi 300B was 3 stage as well.
A three stage directly coupled 300B amp would probably require a 1000 volt power supply. There are a few directly coupled designs floating around out there that are two stages, which keeps the power supply voltage reasonable.
The newest Fi design has a coupling cap between 6SN7 and 300B.
Yep, there are a fair few 2-stage directly-coupled 300B amps out there. Quite a few in the DRD style. I have been thinking about direct coupling to a lowish dissipation 300B (300V, 50mA, 5k-ish load), tho could proabably use a 2A3 for less $$$ and similar power. Sonically?...
Cheers
Hifi Collective's 300B and Brian Cherry's Lux 300B both use 5687, directly-coupled to the 300B ... about 10mA in the former, about 20mA in the latter. am sure there are others ...
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