Roy Mottram brought to my attention last night that his Poseidon board upgrade didn't sound right. He reversed the connections at 'F' & 'G' and things cleaned up nicely. Could you please post if you remember switching these two when you built yours? Basically, I'd like to know how you have F & G wired up stock or swapped and what output transformer you have (Z-216 or A-431, Dynaco or Dynaclone). This should help sort out if there are differences between them or if I just have a huge bug in the manual. All the testing was done on my friend's MKIII with Z-216 (I'll have to contact him). Hammond testing was done on another friend's MKIII with 1650Ns.
I remember swapping phases on the ST70 board, so I *thought* I paid extra attention to the Poseidon. I'm surprised it just doesn't oscillate like a sonuvabuck.
Thanks guys!
--Shannon