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In Reply to: Re: Parallel ECC99 vs EL84 in triode as 2A3 driver posted by danlaudionut on August 3, 2006 at 08:21:21:
Who knows? Its one of the things that I tried and really liked. Don't remember the driver, but it was direct coupled to a 45, with a pair of OB3's (172v) on the output cathode, which in turn sourced the driver's C4S plate load. My PP2A3 amp is the same thing, but with a big resistor shunting 100mA to ground, dissipating about 20W, and pairs of C4S plate loads for the two 6N1P halves (driver). And, I tried this latter set up with 125H plate chokes instead of the C4S. All in all, its a topology which sounds good to me in SE and PP -- the advantage to SE 2A3 is you can get away with a single OD3, as long as the driver draws, say 25mA. The C4S needs 5V across it, so that trims the output by 10%. A choke loaded driver (also sourced from the output cathode) will allow full output. The topology that looks really complicated, but would probably sound very good, is an OD3, a CCS plate load to one half of the ECC99 as hybrid shunt voltage regulator, feeding a choke loaded other-half of the ECC99. I agree with richardl's comment below... --keto
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- Re: Parallel ECC99 vs EL84 in triode as 2A3 driver - keto 19:34:12 08/03/06 (0)
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