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Old 10th Oct 2019, 4:33 pm   #21
Brigham
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Default Re: Vintage neons

'Cold Cathode Tube Circuit Design' by D. M. Neale.

Chapman and Hall, 1964.
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Old 10th Oct 2019, 5:09 pm   #22
Philips210
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Default Re: Vintage neons

Hi.

The book can be viewed here: https://archive.org/details/ColdCath...eCircuitDesign

Regards,
Symon
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Old 11th Oct 2019, 9:30 am   #23
G6Tanuki
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Default Re: Vintage neons

Small wire-ended neons were also commonplace in various 1950s/1960s counter circuits, where they provided threshold-controlled-switching/triggering and 'gating' functions in much the same way as you'd use a Diac - I remember as a student acquiring a bunch of old desk-calculator boards [I suspect from something like an "ANITA"] each of which had a cold-cathode numerical-display tube, a wire-ended thyratron, and lots of flat plastic-encapsulated diodes as well as the neons.

A neon is ideal in such simple logic circuits, where it acts as a kind of Schmitt Trigger/bistable.

Thinking of relaxation oscillators, I remember also seeing a circuit for a crystal-calibrator circuit in one of the ham-radio magazines, where a classic neon/resistor/capacitor oscillator running at around 10KHz had a 100KHz signal from the crystal injected into it so the relaxation-oscillator frequency became locked to the xtal and gave you a set of 10KHz calibration-points.

Also, some of the T/R tubes used in the waveguides of RADAR sets to shield the receiver crystal-mixer from the high-level transmitted pulse used Neon - when the pulse arrived the Neon ionised and essentially placed a short across the waveguide so no RF could continue down the line to the receiver. Water-vapour was also used as the 'filling' in some T/R tubes!
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Old 11th Oct 2019, 9:39 pm   #24
buggies
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Default Re: Vintage neons

Lots of interesting neon circuits (including sequential and random flashers, and-gates, counters, voltage references etc) in this book:-
https://ia802904.us.archive.org/14/i...eNeonLamps.pdf
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Old 11th Oct 2019, 11:23 pm   #25
MotorBikeLes
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Default Re: Vintage neons

Back in #10, the question about neons in 'scopes. Various uses as already mentioned. One which caught me out for a while was the mains indicator on a little TQ S54. It flickered, but I failed to connect it to the "jumping trace" on the screen. Replace neon, trace as steady as a rock.
I remember our physics lecturer explaining the relaxation oscillator circuit at tech. He said it had been used as a timebase circuit in scopes. I used such circuit for comparing capacitors for one of his practicals.
Years later when I first played with valved TQ scopes, there were many stick type EHT rectifiers which tended to go low output. I knocked up a relaxation oscillator using an old 'scope transformer with a good 1,000v secondary as a quick test for the HV rectifiers. If low flash rate, BY182 and series resistor replaced the unit.
Les.
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Old 11th Oct 2019, 11:27 pm   #26
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Default Re: Vintage neons

I only have a modest collection. Apart from the box of 100 NOS CV2213 that was given to me by a supplier as it was old stock and hadnt sold in years.
He still has many boxes of them.
First ones at top are NE-2 for tremelo circuits in guitar amps.
Next four are "Signalite Z83R4-A references.
A lone NE51.
A couple of front panel indicators for 240 volts.

Joe
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Old 11th Oct 2019, 11:42 pm   #27
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Default Re: Vintage neons

Another book with lots of information.

http://www.philbrickarchive.org/jlrm...glow_lamps.pdf

Joe
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Old 12th Oct 2019, 9:20 am   #28
Radio_Dave
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Default Re: Vintage neons

Here's a video of my nixie clock https://www.youtube.com/watch?v=F4v7IDIYiNQ It uses neon ring counters to divide up the mains frequency into hours, minutes and seconds.

Back in the 60's you could buy neons with specific striking and maintaining voltages to be used in ring counter circuits. Unfortunately my clock doesn't and it didn't prove reliable for very long so I can't recommend it as a worthwhile project. It was fun making it though!

There's lots of info on this website https://www.dos4ever.com/ring/ring.html


Regards
David
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Old 12th Oct 2019, 11:22 am   #29
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Default Re: Vintage neons

I helped a chum pull an old shed down and these were inside
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