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In Reply to: Ming Da MC-2A3 preamp schematic posted by jwu - snoopy.org on June 13, 2008 at 18:47:41:
... >Seems convoluted enough but sure convinced me that a lot of thought has been put into the circuit <
This is in referenc eto the bootstrapped cathode follower output stage.
Yes a lot of thought has gone into that, but not by those Chinese thiefs. That circuit was designed & developed by myself, in around 1983 as documented in my 1994 printed Tube Preamp CookBook. It was first used in the RTP3 preamp of 1983/84 and can be seen on Page 9 of the RTP chapter.
Since it's success there, it has been used as our default output stage for preamps and poweramp driver stages, and has gained the marketing name of SLCF (Super Linear Cathode Follower). By our tests, it's by far the most linear and best sounding implementation of a low output impedance output circuit. It is used in our two current preamps, the RTP3D and the SVP-2.
We even use it with jets and bipolars.
Did the Chinese ask permission to use this circuit? What do you think...
Oscillation? It will oscillate very easily, but solved by putting the ESSENTIAL gate stoppers RIGHT at the tube soket pins.
And why oh why do they use 2A3s as rectifiers?
Regards, Allen
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Follow Ups
- IN amonsgt you long post you say... - Allen Wright 04:29:14 05/27/10 (0)
- RE: IN amonsgt you long post you say... - jwu - snoopy.org 23:25:34 08/03/10 (0)
- If they were really Rudycon's, then I might be impressed... - Allen Wright 03:03:31 08/04/10 (0)
- I intended to write: Rubycons. (nt) - Allen Wright 14:53:26 08/04/10 (0)
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