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Original Message
RE: differential input, single ended output
Posted by Eli Duttman on December 8, 2015 at 18:34:45:
You certainly can DC couple the 2A3's grid to a LTP plate. Notice in the preamp that the MOSFET source follower is DC coupled to the non-inverting plate.
That 500 V. of B+ makes for healthy sized LTP plate load resistors, which is good for keeping gain up and distortion down. 200 to 210 V. on the 'T7 plates and 3 mA. of plate current per plate sounds pretty darned good. A 6 mA. tail CCS is what you need.