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    the safety precautions around high voltages.

What kind of tube is this

Hi,
I found two of these tubes some time ago. I cant find any information on it so I have no idea what it is good for.
Does anyone know how to use this tube and what it does?



Thanks
Lawrence
 

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by the looks of the structure, I'd say it is a <i forget the name>

it is sensitive to light, sort of like a photo-diode, but in tube format..
there is no heater, and the plate has some sort of mildy radioactive substance on it (like cesium? i forget)




for use of transmitting a signal via visible light, like the audio track on a old film.

I think I've got a similar tube from tim..
 

PeteM

Member
2003-07-08 12:47 pm
UK
I'ts a photodiode

I worked at a factory that made silicon photodiodes vacuum multipliers and CRT's amongst other things like neutron detectors and Boron isotopes.

I cant' help with specs but remember seeing one of these in the lab for calbration purpose.

Pete
 
Its a photo-cell!

Used to use these in old cinema projectors!--Machines like Kalee with B.A.F Soundheads and Westar machines.

Biassed at around 90v, the film audio track was projected through a slit and optics to the selenium coated cathode which then emitted electrons depending on light intensity

Used to go noisy, microphonic and all sorts, Just an ornament these days!