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RE: RH84 : tried higher B+

FWIW, I tried bypassing the 5V4 with SS diodes and that gave me a B+ of about 305VDC, close enough.

I changed the dropping resistor to the driver B+ cap to 10K ohms.

Put the LM317 on a tag strip away from the tube socket with additional heatsinking.

Unfortunately, the CCS was became unstable from initial power up and the B+ was constantly moving around.

Removed the SS diodes for lower B+ and the CCS worked properly again.

Didn't get into the troubleshooting process, but I think I should just get the exact parts values listed on the RH84 schematic if I have another go at this type of circuit.

The designer benchmarked 1% distortion at 4W RMS for this circuit and I did not come close to that level of performance.

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