AC Det/Amp Triode
The S-27 is described in a Ceco tube manual as being usable in sets designed for Kellogg tubes. The general characteristics are similar to the '27, but a 3 volt filament is used like the Kellogg tube. The Sparton style of side pin connections are used for the heater, making this tube a good substitute for the Sparton/Cardon AC-373. These tubes were intended for the replacement market, but apparently never caught on as they are rarely seen.
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