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Good to hear that 6L6GCs work well at 360v in your amps. Parallelled cathode resistors must result in less heat, nice solution.

My pair must be late production, serials in the 70xxx range, because they have no voltage selector beside the fuse and no Bulgin power connector. Instead there was just a hole for what I think had been an early IEC C10 plug. So I could fit modern grounded 3 prong IEC there without any drilling. It seems that Quad made some different chassis configurations for different markets?
Im in two minds about the Jones connector. On one hand it looks retro funky.. On the other hand, it is less practical to use adaptors so perhaps it would be best to put in phono sockets. I have already removed the internal HT connections from the Jones for safety.
The only giveaway that the amps have been modified is that I placed AC switches where the fuse holders were. But they are old British chromed switches and look contemporary. The fuses are now inside the enclosures.

Martin