[Arran]

Interesting choice of tubes in this little set, I don't think that I have seen anything that used a 6AC5 before, and the 6J8 is a triode-heptode that was used in some Philco Tropics, and Rogers built sets, but not much else. You don't really need a separate mixer and oscillator section in the convertor tube of a two band radio, so this thing must have been built around Philco engineering principles, design the set around whatever tubes you can get cheap, in bulk, and immediately.
Regards
Arran