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ID = 18552
United States of America (USA)
Brand: RCA (RCA Victor Co. Inc.); New York (NY)
Developer: RCA (RCA Victor Co. Inc.); New York (NY) 
Tube type:  Double Triode 
Identical to 1684 = 2033
Similar Tubes
Differences not known by us:
First Source (s)
1951 : Tube Lore (I)
Production stop 1964
Predecessor Tubes 1679  
Successor Tubes 6211   5844  

Filament Vf 6.3 Volts / If 0.3 Ampere / Indirect / Specified voltage AND current AC/DC
Description Min. Medium- µ duotriode, 1679 w/ heater current cut to 300 mA and improved plate-current characteristics; repl. 1679. Sold only to IBM and branded w/ "IBM" and part no. 304994. Intro. 1951; withdrawn 1964. Superceded by 6211, which had separate cathode leads. [Information by L. Sibley] 

564~~2.png 1684: Telefunken Werkstattbuch
Wolfgang Bauer

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