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SN-1724D

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ID = 39215
       
Country:
United States of America (USA)
Brand: Sylvania (Hygrade, GTE, Nilco); Emporium (PA)
Developer: Sylvania (Hygrade, GTE, Nilco); Emporium (PA) 
Tube type:  Twin double-plate triode 
Identical to SN-1724D
Predecessor Tubes 6J6  
Successor Tubes 7244  

Filament Vf 6.3 Volts / If 0.45 Ampere / Indirect /
Description Ceramic, stacked-mount equivalent for 6J6. Designed by Sylvania under a contract with the U.S. Bureau of Ships to replace heat sensitive mica insulators and glass envelopes. It was the forerunner of the glass types 7244 and 7245, that retained the internal stacked structure, with planar electrodes and ceramic spacers. 
Literature -- Original-techn. papers.   Electronics, August 1954
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