Very early compactron

[wa2ise]

I was thinking, when I saw the article title before looking at it, it might have been one of those multi-function tubes made in Europe before WW2. Some of those had resistors and caps inside the glass envelope. Something about a tax assessed on the number of tubes in a radio, they counted a single glass envelope as one tube, even if it had a diode, 2 triodes and a pentode inside the single glass envelope.