They are really just the output stages. The left and right front ends (paralleled 6sn7, SS CCS loaded, cap coupled to a center tapped, phase inverting, grid choke) are on a third chassis with a LCLC power supply for the front end on a forth. The 300b's are running 72ma. cathode biased with 360VDC across the tube. I will be increasing the current in the output tubes slowly until I find that sweet spot. The output stage supply is 5u4 10HY 20uf (oil) 2.5Hy 40uf (oil)
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