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Hi all, ?This is a type of tube (electronic valve) that some of the old-timers may remember. This is a first for me. Some of the old receivers out of the 1930's-ish used them (about a century ago).

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Regards, Karl Shoemaker
To contact me, please visit SRG's web site at?
for the current email address.

More recently than the 30’s pentagrid tubes were in just about all “all American 5” radios, like even in the 70’s. They ran on 110 volts ac or dc. Included 35w4 rectifier and 50c5 audio output, etc.?

From the 1968 RCA Receiving Tube Manual....