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ID = 4657
Tube type:  Triode, vacuum   Power-supply 
Identical to 6BK4C = 6EL4A

Base Octal (Int.Octal, IO) K8A, USA 1935 Top contact with a cap.
Filament Vf 6.3 Volts / If 0.2 Ampere / Indirect / Specified voltage AND current AC/DC
Description High-voltage shunt regulator. 27KV, 1.6mA, 49W absolute maximum ratings. 
Tube prices 1 Tube prices (visible for members only)
Information source Essential Characteristics, GE 1973   
6BK4C: My Collection
Bruce Morgenstern

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6BK4C: 6BK4C RCA RC-29 - 1975
Vitor Oliveira

6BK4C: RCA Tube Manual
Peter Hoddow

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