[Arran]

The schematic on Nostalgia Air shows 11 tubes, 6K7, 6J8, 6K7, 6H6, 6J5, 6J5, 6J5, 6F6, 6F6, 6J5, and a 5V4. The N.A schematic apparently came out of the Riders manuals, I will check the Philco book to see if anything was revised, they usually included notes if they did change anything during the production run. I don't think that the 6L6s are correct in any case, the 5U4 could have been a substitute for the 5V4, they have similar electrical characteristics.
Regards
Arran