Hi Bill
The RCA 5BT was made in 1936 and has a value in the $100-$125 range. The schematic is in Rider Vol #8. It looks like you need a 3 volt "A" battery for the 2 volt tubes with a resistor built into the radio. Also three 45 volt batteries make up the "B" battery and -7 1/2 & -3 volts are called out for "C" battery. With your tube lineup it's an interesting radio.
Norm