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The schematic gives R8 as volume control and R11 as tone control. I bet
the rear control with a round housing is the tone control. Also on the
schematic, you can read near the little drawing at the bottom:
Triplett Mfg Company Switch (unreadable). This is described
as a Hookup for phonograph. I guess this is the other rear control,
however I don't see an input connector for that phono.
Concerning the tube number etchings, kbmuri is possibly right, but
remember that some of these tubes may be more modern replacements,
so be careful when you rub them.
Good luck with the project.
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