Wink, as a helpful suggestion, a schematic should always show the internal elements of a tube (or other active device like a transistor as the case may be). A quick Google under 'Vacuum tube symbols' and 'Electronic symbols' would probably yield a lot of good info.
BTW, that's a gorgeous resto you did on the Stromberg Carlson radio.
If i may, being a cantankerous old fuddyduddy, i'd like to air a perennial gripe (again) about vacuum tube nomenclature. That's in the usage of the terms "filament" and "heater". Back in the day, for a techie to use those terms incorrectly earned a demerit and severe reprimand.
A tube with an indirectly heated cathode uses a heater, not a 'filament'. Whereas when the filament
is the cathode and the direct emitter of electrons, is simply called the filament. Off soapbox now.
