compact Dowdy/6SN7 direct-coupled to PP2A3

MagneQuest/Peerless Forum

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What's that venerable name doing in the title??
V2nd was kind enough to safety-check my direct-coupled PP2A3 amp schematic and also included a suggestion for a PP input instead of the SE one I'd been using. Lacking parts for the negative rail, I reached for the Dowdy Choke on hand for current sink duty on the 6SN7 shared cathodes, a perfect 16mA CCS for that 5V cathode bias (an 8mA C4S current source on each plate). 100K pot on one 6SN7 grid, and the other grounded.
With a 12uF cap input (wish I had a 4uF on hand) and what looked like "arcing" in the 6BY5, I decided to return to choke input and be satisfied with just a couple watts of output.
One of the 6SN7's I'd collected balanced up (via C4S w/ trimmer) nicely, and the amp sounds pretty sweet. Thanks V2nd, for the PP input suggestion.
--keto

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Topic - compact Dowdy/6SN7 direct-coupled to PP2A3 - keto 19:46:26 05/08/04 (1)

another 6SN7 variant - keto 14:18:43 05/11/04 (0)

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