(1) 1927 to 1928 Q.R.S. 85 Mills Cold Cathode Tube.
Brass Pins with a hot stamped base with embossed logo on the bottom.
The factory stamping on the base didn't penetrate the base all of the way but it is still legible.
The base is tight and secure with no looseness.
This tube is untested. Working condition is unknown and is being sold as-is described and pictured so please assume it to be for display only.
Interesting history behind the Q.R.S. 85 Mills tube.
Because this filamentless design closely resembled Raytheon's own design, Raytheon filed a patent infringement lawsuit against Q.R.S. in 1927/28 which was settled out of court. Soon after, Q.R.S. entire tube manufacturing, tooling, patents and inventory was absorbed by Raytheon. This a rare relic from tube radio's earliest days is a great example of that brief period in time.
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