[Boatanchors] Sonar FM Modulator - Schematic or Tube Layout ?

[BLIMPY]

I have a circa 1948-50 Sonar FM Modulator.
This is just an fm unit that plugs into the Xtal socket of a cw 
transmitter.

 Got it missing the tubes and the top cover years ago.

I have no docs.

Obviously, I can draw out the schematic... but I have no clue what tubes the 
thing uses !
Which slowed down my chances of overhauling it considerably !

Not on BAMA.

Anybody help  with tube compliment or other info ?