Quote:
Originally Posted by Ampico-kid
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
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My 1945 "Sylvania Aids to War-Time Servicing" lists the 71A as a substitute for the 182B but not the 183.
For the 183 they list 182B/482B and 12A. They suggest changing the bias or plate volts for the 12A. The 12A has a different filament current which would affect a series application.
They also list the 45, 46 and 2A3, but these require more intensive modifications.
It's curious that they list the 71A as a substitute for the 182B but not for the 183 even though the 182B is listed as a substitue for the 183. Maybe they intend for you to refer to it. If so, they also suggest a bias or plate voltage change for the 71A for best performance.
John