Wade Bequest collection of valves: Edison model 501 type IJB-1861 delay relay radio valve
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Wade Bequest collection of valves: Edison model 501 type IJB-1861 delay relay radio valve.
Marked Edison / Model 501 / Delay Relay / West Orange, NJ / FE on one side of base and B2204 6.3V 300 [seconds] / CTS N/O 3 AMP / 450V DC 450V AC / IJB-1861 marked on other side of base. Tubular bulb with I/O base.
