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ID = 30792
Tube type:  Double Triode 
Identical to 5687WB
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Normally replaceable-slightly different:
Other class quality (otherwise equal):

Base Noval, 9 pin miniature (USA pico-9) B9A
Filament Vf 12.6 Volts / If 0.45 Ampere / Indirect / Specified voltage AC/DC
Description Dual triode for computer use. Cathode material assures low interface resistance even after prolonged cut-off conditions. Heaters can be series connected, 12.6V, 0.4A. Note the unusual base connections, with the heater center tap to pin 8 and the anode of second triode to pin 9. 
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Information source -- Collector info (Sammler)   
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no44_g_1~~1.gif 5687WB: RTT Schwandt
Günther Stabe † 19.8.20

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