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| Pair of C12's pulled from an early homebrew. One is a Cunningham brass based tassletop marked C12. The other with Bakelite base has no tube marking except RCA logo on base. They both appear to be same type. I operated them in a Crosley 51 radio at 1.5 volts filament, 22 detector, 45 volts amp and they worked fine, interchange from detector to amp (swapping the tubes in their sockets) was significant to performance. I did a rough test on my Hickock H533 testing as 201A......with 1-1/2 volts! With bias set for 01A emission read 550 and 750. With no bias or English, both tubes read 1.5 k. Gas test very good/excellent and no shorts. Both tubes for |
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