Hi John.
That's the factory supply and original transformer. It came with fins! You can see them in the manual photos.
Somewhere along the line, the 866As were replaced by a pair of solid state rectifiers.
I fired it up today. Initially ran 120V to 240V wired HV transformer. No smoke or bang. Swapped wires and still no smoke or bang.
With grid grounded, there's a pleasant glow from the anode.? Meter reads ~2800 V and ~85 mA. Misplaced my HV probe so
verification will have to wait a bit until it's found.?
Will apply drive later today or Saturday. Have to clear space on the bench first :-)
You can just make out some red glow from the anode.?
Bob ah7i