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A horizontal ribbon.

57S
Sharp-Cutoff Pentode

EIA Base & Outline

EIA Base: 6FEIA Bulb: 12-2
Source ........................................ ARRL HB -1947

Application

Glass type used as biased detctor in ac-operated receivers. Requires six-contact socket. Has external shield connected to cathode.

Mechanical Data

Bulb .......................................... ST-12
EIA Outline ................................... 12-2
EIA Base ...................................... 6F

Electrical Data

Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.4 A

For other characteristics and typical operation, see 57

A horizontal ribbon.

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Sat, 02 Jul 2022 23:16:30 -0700