Found this in an old tube caddy. It is a Perma-Power CRT adaptor of some sort. 10BP4 era. No readable part #. A short adaptor at the tube about 1" long and all wired pin to pin. Inside are a resistor, neon bulb and a brown thing. They are wired across pins 2,10, and 11 (G/K) but not the filaments. ???

Wild guess... it’s a pattern generator. The neon bulb is in a relaxation oscillator circuit, “triggered” by the blanking pulses, which produces bars for linearity adjustments. :scratch2:

jr

Wild guess... it’s a pattern generator. The neon bulb is in a relaxation oscillator circuit, “triggered” by the blanking pulses, which produces bars for linearity adjustments. :scratch2:

jr

Brilliant!

Found this ad in Radio Electonics , Jan 1954:

jr