All valve/tube clock

[Grahame Marsh]

Hi

I have been working on a new trigger tube clock that uses the Z700U
trigger tube. This tube has a priming electrode so works in complete
darkness. Results are very good. Details are here:

http://www.sgitheach.org.uk/nixie8.html

Enjoy
Grahame
Highlands Scotland

[Nigel Walker]

Fascinating project.

I must congratulate you on such a thorough and well documented description
of your work.

Nigel.

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[threeneurons]

Sweet !

Well, Grahame, it looks like you're the only guy who has made two of these puppies !

Mine is sadly, still just a pile of unfinished paper work.

[Grahame Marsh]

On 07/10/2014 17:12, 'threeneurons' via neonixie-l wrote:

... and this one actually works through the night!  The other is now being robbed for parts.

Here's a very rough video of the very rough board test build on a sheet of mdf.

http://www.sgitheach.org.uk/rough.wmv

Aluminium and acryilic here we come.

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[John Rehwinkel]

... and this one actually works through the night!  The other is now being robbed for parts.

Here's a very rough video of the very rough board test build on a sheet of mdf.

http://www.sgitheach.org.uk/rough.wmv

That is mesmerizing to watch!  Circuitry you can see operating always thrills me.  The flying colon lights are a cute touch.

- John

[Oscilloclock]

That's a beautiful sight Grahame! Makes me want to shove aside the beloved CRTs and start playing with my nixies... (Okay, maybe I'm just joking a little there.)

I love anything all-valve! I wonder if anyone has built any all-valve nixie circuits other than timepieces?

Aaron

[Dave]

Wow!  Grahame you have once again done it!

I'm still working on my CRT clock.  Maybe I'll get to this one one day too.

Quite the accomplishment.

[Grahame Marsh]

Hi Dave

I wondered how you were getting on. The trigger clock was a diversion from scope clocks for a while and now I'm back working on my next scope clock.  32 bit AVR at 66MHz, digital synthesis of the sine and cosine waves (so no fiddly set up), 4kV CRT PSU so will drive most 5" CRTs including those with a PDA, wifi connected, IR remote handset. But months away yet.

Cheers Grahame

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[Dekatron42]

Really nice clock, I wish I had that many Z70Us.

/Martin

[Nick]

Very please with my kit - thanks Grahame!

Custom transformer arrived yesterday, so all set now for some quality time in the workshop over the holiday!

Nick

[Grahame Marsh]

Nick

Good progress then.  Do get back to me with questions please. I look forward to seeing your final build.

I helped Tom Nolan in Ontario (on Neonixie) find a winder in Toronto who quoted $90 Canadian (presumably plus postage and tax, if any). He was very suprised by the price in a pleased way as he had assumed it would be expensive.

The built clock here continues to work... waiting for the case from Nick Stock (who is in the UK with family for his mother's wedding).

Cheers Grahame

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[Tom Nolan]

Grahame is correct - the transformer is $90 + taxes + shipping from:

http://www.sumr.com

It'll be ready in two to three weeks.  Its a busy time for me so that'll give me lots of time to build the boards.

The transformer will weigh ~0.9 Kg so shipping may not be too high (they are a twenty minute drive for me).

This is a marvelous clock and Grahame has been incredibly helpful.  He found SumR for me - even though it is the same as Primrose Audio who I knew about and am planning an audio project with their audio transformers.

Langrex seems to have lots of D700U's - I had 100 already.


Tom

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[Nick]

On a similar note, if you are in the UK, mine came to almost exactly the same price, GBP 49.50 (including fixing kit) + P&P and took 7 days - I did a fair bit of shopping around and these guys came out on top using my metrics (a: confidence in safety, b:price, c:size). YMMV.

Its 50VA, 9cm x 3cm and weighs in at 0.8kg (see photo above). - small, nicely finished & constructed. Primary 0-110-230VAC, secondary 0-6.3VAC @ 1.5A and 400-0-400VAC @ 50mA. Also included was an earth screen.

Manufacturer was Avel Lindberg Ltd. - http://www.avellindberg.co.uk- chap I dealt with, Chris, was extremely helpful and suggested that for a small form factor, the transformer should be vacuum impregnated with varnish to improve insulation as there is an 800V secondary winding (400-0-400VAC) - he also suggest that the standard Melinex Tape Finish should be replaced with a Terylene Tape Finish to ensure a greater take-up of the varnish. Should you wish to get your own one, the custom design reference number was CE7143/1. Chris also pointed out that the varnish cuts down on mechanical hum - they do a lot of custom transformers for the audio valve/tube industry, so are used to designing HV toroids...

All that was included in the price.

Nick