Category: Volume 5

On the Cover The NT57T Silica Valve In this issue

On the Cover When did you last see an LRS Relay, let alone two in the same room? In this issue

On the Cover A Marconi-Osram T.30 transmitting Triode, next to an unidentified but Admiralty-looking triode of WW1 vintage In this issue

On the Cover Five 320A triodes, each rated at 150 KW dissipation, under test, probably at the Bell Labs radio site at Whippany, NJ. In this issue

On the Cover Three VAC-M lightning protectors In this issue

On the Cover The Moorhead vertical-anode version or the British “R” valve of WW1 In this issue