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ID = 22707
Brand: Phönix Röntgenröhrenwerk, Rudolstadt (Ostd.)
Developer: Funkwerk Erfurt, VEB, RFT (Ostd.) - vorm. Telefunken GmbH 
Tube type:  Transmitting Tube, Pentode, air cooled 
Identical to SRS501
Similar Tubes
Normally replaceable-slightly different:
Successor Tubes SRS455  

Base 2 Top contacts.
Filament Vf 12.6 Volts / If 1.5 Ampere / Indirect / Specified voltage AC/DC
Description Entwickelt im Funkwerk Erfurt, Verlagerung der Produktion etwa 1958/59 in das benachbarte Rudolstadt (Phönix). 
Dimensions (WHD)
incl. pins / tip
102 x 280 x mm / 4.02 x 11.02 x inch
Weight 250 g / 8.82 oz
Information source
SRS501: Eigenes Bild
Anonymous 971 Collector

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SRS501: RTB Funkwerk Erfurt 1956
Wolfgang Eckardt

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SRS501: RFT Special-Purpose Tubes_1959/60
Wolfgang Eckardt

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