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1681

Information - Help 
ID = 25484
       
Country:
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:  Beam Power Tube   Power/Output 
Identical to 1681
Similar Tubes
Other class quality (otherwise equal):
  6AQ5
First Source (s)
1950 : Tube Lore
Production stop 1952

Was used by Technology / Measurement
Filament Vf 6.3 Volts / If 0.45 Ampere / Indirect / Parallel, (AC/DC) /
Description

Beam power amp., modified 6AQ5. Had special control grid and tungsten heater wire in place of "Dowmo". Tested for zero-bias plate current, cutoff, shorts, and life. Sold only to IBM. Intro. 1950; withdrawn 1952. (IBM reportedly got better quality w/ GE and TS tubes.) Tubes were to be etched "6AQ5," and branded w/ "IBM" and probably w/ IBM part no. 300706. [Information by L. Sibley]

 

 
6181_so.png
1681: ARRL Handbook 1972
Michael Schlör

 

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