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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets.

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Old 22nd Aug 2015, 11:53 am   #1
flyingtech55
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Default 4313C valve

Hi folks

I've found another valve which I don't recognise and cannot find listed. It's a 4313C or CV75. It appears to be a cold cathode device so presumably an indicator of some kind.

Any ideas?

Thanks in advance,

TimR
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Old 22nd Aug 2015, 12:21 pm   #2
HamishBoxer
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Default Re: 4313C valve

Cold cathode Thryatron.Hope this helps.
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Old 22nd Aug 2015, 1:08 pm   #3
Jeremy M0RVB
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Default Re: 4313C valve

Specs here: http://www.tubecollector.org/cv75.htm

Jeremy
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Old 23rd Aug 2015, 12:57 pm   #4
flyingtech55
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Default Re: 4313C valve

Excellent, thanks for the info folks. What were these typically used for?
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Old 24th Aug 2015, 9:28 am   #5
G6Tanuki
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Default Re: 4313C valve

They were used for pulse-forming or pulse-shaping: basically, the valve passes no current until a specific voltage is applied to the 'control' electrode - at which point the valve turns hard 'on' and current flows between the other 2 electrodes, and continues to do so [uncontrolled by the control-electrode] until the voltage across the main electrodes drops below a certain sustaining value, at which point the thing turns off again.

You'd typically find them used in electronic counters, oscilloscopes, waveform-generators, Radar gear, video processing/distribution, teleprinter systems, some heavy-duty power supplies [often associated with controlled-arc mercury vapour rectifiers], industrial welders and the like: anywhere where you need a circuit to 'fire' at a particular voltage.

They're essentially the valve equivalent of a Thyristor/Triac.
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