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ID = 8511
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  SEMICONDUCTOR, general   Frequency converter 
Identical to 1N21B = TH8121B
Similar Tubes
Normally replaceable-slightly different:
  1N21 ; 1N21A ; 1N21C ; 1N21D ; 1N21E ; 1N28 ; CV727 ; TH8021B
First Source (s)
04.May.1946 : Electron Tube Registration List 493

Base No base
Was used by Radar

Silicon, poit-contact mixer diode, NF 12.7dB at 3GHz.
Also available with following suffixes: R, reverse polarity; M, matched pair; MR reverse polarity matched.

Text in other languages (may differ)
Dimensions (WHD)
incl. pins / tip
7 x 22 x mm / 0.28 x 0.87 x inch
Weight 2 g / 0.07 oz
Information source Taschenbuch zum Röhren-Codex 1948/49   
Tube Lore (I)   KTT 1969/70
- - Manufacturers Literature

do22_6.gif 1N21B: KTT 1969/70
Günther Stabe † 19.8.20

1N21B: Compagnie Françaiqe Thomson Houston
Patrice Zeissloff

Usage in Models 1= 1955?? ; 1= 1956 ; 1= 1972??

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):3

Collection of



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