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SY235

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ID = 73434
       
Country:
United States of America (USA)
Brand: Sylvania (Hygrade, GTE, Nilco); Emporium (PA)
Tube type:  Screen-grid Tetrode   RF/IF-Stage   Controlling (mu) 
  Ca. 1925 up to 1945 rare.
Identical to SY235 = 35 = 235 = 335 = 51
Similar Tubes
Normally replaceable-slightly different:
  ER551

Base UY-Base, 5 Pins (USA, April 1927) Top contact with a cap
Was used by Radio/TV-reception etc.
Filament Vf 2.5 Volts / If 1.75 Ampere / Indirect / Parallel, (AC/DC)
 
20200302_222142.jpg
SY235: RMG
Robert Gillespie

 
35~~11.png
SY235: Fin Stewart
Fin Stewart

 

from Just Qvigstad


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