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21BTP4

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ID = 26971
       
Country:
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Television picture tube black+white 
Identical to 21BTP4

Filament Vf 6.3 Volts / If 0.6 Ampere / Indirect
Information source Essential Characteristics, GE 1973   
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21btp4_sock.png 21BTP4: Essential Characteristics
Anonymous 15 Collector

Usage in Models 2= 1956? ; 48= 1956 ; 135= 1957? ; 6= 1957 ; 4= 1958? ; 2= 1958 ; 7= 1959 ; 1= 1960??

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):205
 

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