IC cap and JACKCON cap? A power resistor on top of cap?
Polyamide coated magnet wire wires?
Is that a Radio Shack protoboad?
I don't like tywraps for final builds they age and will break.
Flux on shunt to ground control, 100 ohm loading at one setting?
No pull down cap on the output cap and if that is a paper and oil cap that is not made with good paper it can leak and cause noise from the way the output volume is wired.
The two transformers are at 90 degrees however, they are close together.
No regulation on the heater supply? Good NOS tubes are getting harder to find and US wall voltages seem to be 120VAC and up sometimes.
Are the light bulbs for compression and/or limiting of some kind?