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ID = 4538
Tube type:  Triode-Pentode 
Identical to 5X9 = LCF200
Similar Tubes
Heater different:
  6X9 ; 8X9

Base Dekal, B10C
Was used by Radio/TV-reception etc.
Filament Vf 5 Volts / If 0.45 Ampere / Indirect / Specified current AC/DC ~ = (Series working)

Triode mu 55, gm 4.8 mS, 1.75 W

Pentode gm 4.8 mS, 2.4 W, identical to 6EJ7

Used in television receiver for IF amp, noise detector, sync separator

Tube prices 1 Tube prices (visible for members only)
Information source Essential Characteristics, GE 1973   
Tube Lore (II)   page 46

5x9_sockel.png 5X9: Essential characteristics
Peter Hoddow

Just Qvigstad

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