EWBrown wrote:Are the 6B4s on or off the PCB? (I'm already thinking of a 2A3 variant) Yellow_Light_Colorz_PDT_02
TerrySmith wrote:Hows about a picture of under the hood!
EWBrown wrote:You might be getting a tiny bit of hum induced by those long unshielded input leads, especially as they transit by the C354 choke, and under the power trannie, try twisting them together, that should help. I would SWAG that the final config would have the inputs closer to those on the PCB.
/ed B inNH
TomMcNally wrote:What are your test conditions when you measure the residual noise ?
TomMcNally wrote:Also - most DC filament circuits I've seen have one side grounded, and no balance pots. Are you saying to leave the filaments floating and use a pot with the wiper grounded ?
EWBrown wrote:I take it that the 6AX5 and 6SL7 have AC on the filaments, and the 6B4Gs have DC?
EWBrown wrote:I wonder if it would be beneficial to use DC on the 6SL7 as well (and perhaps on the 6AX5, though that isn't going to make a dime's worth of difference, except for circuit simplicity).
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