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- Locked Door Tube Factories
I present this article, every so often, to remind vacuum tube collectors what the business was like, in the early 20’s, after WW1 for the powers that be to enforce their patent rights. Patents are only as good as your policing of them. This article appeared in the November, 1924 issue of “Radio” magazine. - Early Wireless
This postcard was conceived by prominent artist Charles Allen Gilbert (1873-1929) around 1909 and his female subjects called “Gilbert Girls” appeared in hundreds of magazines, etc., around the country. I have seen this same subject in a full-sized framed calendar as well with smaller tear-off days and months at the bottom for the year 1910…. - Marconi Catalog with Fleming Valves
The Marconi catalog above is without a doubt the most accurate and finest scan of the original that can be had. Prominent Marconi collectors, Felicia and Jim Kreuzer, provided the front and rear cover and answered many questions as to what was in between, meaning the pages that are blank. As can be seen, the… - Point-of-Sale QRS Red Top
The QRS Music Company had their own sales gimmick for the Red Top tube- a spinning top toy stating “Red Top Radio Tubes are Better.”. The red top features a double grid, double plate, and double filament and is designed to burn both sets of elements at one time. QRS bought the remaining equipment from… - 4 R Valves Etched Differently
Fig. 1 above has the usual Post Master General markings, R valve and the words “Made by the MO Valve Company”, GEC, made in England. However, there is no mention of the patent status. Considering the plain box that only states R, it may seem that this group of tubes were the first to be…