Is there any 50W 300B SET monoblock out there?

Allnic makes 25 and 50 W 300B SET monoblock's.

In order to produce more power in a SET tube, the potential difference between the cathode and anode has to increase. When this voltage goes up to a point, the tube will start to emitt other radiation such cathode ray, ie electron. Higher still, it will emitt x-ray. I am a radiologist so I know.

There is legal restriction to control this type of potential X-ray tube. No one want to have x-ray examination while running his up power SET amp. That's why.

Lovely. I'm no designer but that layout looks remarkably clean to me. Very impressive. How much does the beast weigh?

OP, I agree with comment from noromance. If you need power and love SET sound, you owe it to yourself to check out the Dehaviland line. For many tears they've been focused on SET triode amps that are compatible with a wider variety of speakers. A rare treat! Cheers,
Spencer

Wrm, about 180lbs per side. The output transformers weigh 62lbs each.

Here's a pic of the OPTs before potting, with an ECC83 tube for reference:

OPT Core