So much did I enjoy the EF86/morph control in the SE amp that I built a couple of months back, that I thought I'd take the same concept into more powerful gigging amp. Finished the (Ef86 concept) version of this amp tonight. Didn't get a chance to really blast it yet, but it sounds very promising. Happy to say no buzzes or rattles or hums. Tone is EF86tastic! (Need to do some soundbytes). Tone controls need tweaking to get the scoop/hump concept improved upon. (Corrected/edited) schematic of as-built version with measured idle voltages attached below. I think it needs a voltage tweak in the power rail. I'll chuck a 5AR4 in and see how that goes (or maybe drop the first supply resistor to 4k7).