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Opto Electronic Devices

Tuning Indicators

Tuning Indicators or 'Magic Eyes' are small cathode ray tubes that indicate signal strength by the deflection of an electron beam on a phosphor target. The phosphor is almost always green. They sometimes also include a triode to amplify the indicated signal.

DM70
DM70
EM11
EM11
EM34
EM34
EM80
EM80
EM81
EM81
EM84
EM84
EM87
EM87

ME4
ME4

Photocells

Vacuum Photocell
unknown
Vacuum Photocell
unknown2
20CV
20CV
5652
5652
923
923
CMG8
CMG8
CV248
CV248
PE50
PE50

Cadmium Sulphide Photoresistors


Photomultiplier

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Andy Cowley, 2006 - 2008    Home