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ID = 39215
United States of America (USA)
Brand: Sylvania (Hygrade, GTE, Nilco); Emporium (PA)
Tube type:  Twin double-plate triode 
Identical to SN-1724D
Predecessor Tubes 6J6  
Successor Tubes 7244   7245  

Filament Vf 6.3 Volts / If 0.45 Ampere / Indirect

Ceramic, stacked-mount equivalent for 6J6. Designed by Sylvania under a contract with the U.S. Bureau of Ships to eliminate heat sensitive mica insulators and glass envelopes. It was the forerunner of the glass types 7244 and 7245, which retained the internal stacked structure, with planar electrodes and ceramic spacers inside a miniature glass bulb.

Information source -- Original-techn. papers.   Electronics, August 1954
SN-1724D: RMG
Robert Gillespie

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