It's my new linestage. 12B4A amplifier valve and 12BY7A active loads behind their respective 12B4. It's waiting on acquisition of the four RCA jacks and a few yards of under-hood wiring.

DC filament supplies, all L-C single stages with a lot of capacitance. Still need to tune the filter voltages.

I considered the 6S4 but don't need all that much gain. I am also fairly comfortable with using the 12B4.
regards,
Douglas