Experimental Cathode Ray Commutator Tube SH121
              Tube cathodique commutateur
              Kathodenstrahl-Schalterröhre
			  Marking: SH121 P163 NB 20977.
              Possibly made by Western Electric.
              This tube seems to operate on the same principle as the Cyclophon (US Patent 2474810 Multichannel Cyclophon, Federal Telecommunication Laboratories 5738 Commutator Tube).
              24 target anodes.
			   
			  
			  Longueur • Length • Länge : 352 mm • 13"7/8
              Diamètre • Diameter • Durchmesser : 51 / 88 / 118 mm • 2" / 3"1/2 / 4"5/8
              
              
              
              
              
              
              
               
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