Finished up my Mk II Poseidon yesterday, have some questions and observations:
Have the Poseidon (Auricaps) and SDS cap boards: 50/50/50/50, using hexfed diodes in HV and bias, no 5AR4.
Shannon, your schematics don't show the 680 ohm resistor to ground; but you list it in the BoM. might want to add that for the inexperienced builder. BTW, one of my "680s" measured 792, a reminder that everything should be replaced.
Initial listen with 12AX7, 12AU7 and EL34 was harsh, no bass (no break in). Rolled into 5751s and 12BH7s, much better bass and much smoother. Exchanged EL34s for KT77s and better all around, especially in the mid-bass to bass region. Still experimenting: haven't decided whether to go with ECC99s or 12BH7s, both have advantages Yellow_Light_Colorz_PDT_02
Only problem I have at this point is with the HV supply, having removed the 5AR4, replacing it with Hexfeds and a CL190 surge limiter on the 110v side, my voltages are about 50 volts too high: any suggestions? I was thinking of adding a 50ohm 10 w resister in series with the C354 choke, but that would only drop abouth 10 volts based on a guess. Any other suggestions?
Thanks,
Ed