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Dave A

06-10-2021 06:54 PM

What is it?

1 Attachment(s)

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. ???

jr_tech

06-10-2021 09:04 PM

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

old_tv_nut

06-10-2021 10:26 PM

Quote:

Originally Posted by jr_tech (Post 3234544)

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!

jr_tech

06-11-2021 09:29 PM

1 Attachment(s)

Found this ad in Radio Electonics , Jan 1954:

jr

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