[codefox1]

The 1619 is an octal based tube with approximately the same filament voltage requirements but a bit more current. You will need to connect the G2 to the plate, and otherwise connect the remaining elements (G1, Cathode, Plate, and filaments) as shown in the tube manual. You will then have an ersatz 45 output triode circuit.

You can accomplish this by replacing the tube socket on the radio with octal types, or making adaptors with a male 4 pin and octal female sockets (Make sure you have enough height in the cabinet!.) Perhaps a less than stellar set or 45's might be obtainable a a reasonable price if you are not in a rush, and do not want to customise this set. I would think you could get a pair of just OK 45's for maybe $25, and they would probably last a very long time in an ordinary radio in good condition.

Pinouts for the tubes are available at Nostalgia Air and other places if you want to go on, and duds and sockets are not hard to find to build adaptors. 1619's are cheap, but not as plentiful as they once were. Again, patience is your friend.

Of course there are dozens of other options, all of them reversable, to get a set that otherwise works OK to go the final mile and play through the speaker whilst you are waiting for the right parts.