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1B59 glow modulator

Size This valve measures 72x31mm overall and has an octal base with only two pins fitted.

The 1B59 is an cold-cathode actinic crater glow modulator, on an octal base with just two pins fitted. This was used in fax machines and half-tone scanners.

In the military it was used in the AN/USA-23 Surveillance Recorder Sub Assembly, which was part of the AN/AAS-14 (and A and B) Infrared detecting set (a part of AN/UAS-4).

Crater 0.06"
Min luminance 170,000 cd/mˆ2 @ 30mA
Current 5 - 35mA
Breakdown volts 225V max
Running volts 150V
Modulation rate 15kHz max.


Pin Function
1,2 no pin
3 Cathode
4, 5, 6 no pin
7 Anode (should be marked by a red dot)
8 no pin

Also known as R1130B

1B59 top view 1B59 base

Inside view  R1130B
Left: internal view of the 1B59; right: a Sylvania R1130B showing an extra internal mica and flattened glass 'top' (picture courtesy of Mike Wijnants)

Sylvania example above, EEV below.


Thanks to Roy Johnson and Ludwell Sibley for information

This file was last modified 11:08:36, Tuesday June 09, 2015