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228R

Information - Help 
ID = 35217
       
Country:
United States of America (USA)
Brand: Amperex; New York
Tube type:  Transmitting Triode, air cooled 
Identical to 228R
Predecessor Tubes 228A_WE  

Filament Vf 21.5 Volts / If 41 Ampere / Direct
Description Pure tungsten filament transmitting triode; mu 16, 5KW plate dissipation, 3MHz. Similar to 228A with factory-installed forced air cooling radiator. Offered by Amperex in 1938. 
Information source Tube Lore (I)   
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