Substitute for 183/483 tubes

[Ampico-kid]

Originally Posted by bandersen

Any ideas for subbing 183/483 audio output tubes? Between my two Sparton radios I need 4, but only have one They're hard to find and expensive.

I read elsewhere that a 71A is a possible substitute. Can anyone confirm that? Would I need to alter the bias or wiring?

According to my 1951 Rider Tube Subsitution Guide Book the 71A is an "Excellent" sub for the 183/483 with no changes necessary to the circuit. They also indicate that a 182B/482B will sub.
Bob