Are you sure this is Dale's design? I agree with PLCPROF, what prompted him to do with 1950's parts? With the LED pilot light, I really wonder about the 6X4 rectifier, surely the solid state replacement was more than available by then!
Thanks for posting it, it was 99% curiosity, I don't know what happened to the stuff I had about this. I maintain my position, I'm going to stick with the solid state version! I'm not sure the two tubes would even fit in my current enclosure, and I'm almost sure they'd melt it! I know that 5" piece of 1" PVC would NOT fit into my enclosure! That transformer is no piker either, it's a chunk of metal!