XC24...
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Grahame
Aug 4, 2016, 8:24:42 AM8/4/16
to neoni...@googlegroups.com
Wow! Hen's Teeth! Rocking horse.. (you know)
Grahame
On 04/08/2016 13:11, Nick wrote:
> After wondering if I'd ever actually see any if these, I finally found a few... NIB in very pretty little boxes...
>
> Nick
>
David Forbes
Aug 5, 2016, 1:31:16 AM8/5/16
to neoni...@googlegroups.com
Nick,
That's a lovely tube, but the box itself is worth the admission price. A
set of tube guts playing the fiddle!
--
David Forbes, Tucson AZ
That's a lovely tube, but the box itself is worth the admission price. A
set of tube guts playing the fiddle!
David Forbes, Tucson AZ
Keith Moore
Aug 5, 2016, 8:11:12 AM8/5/16
to neonixie-l
That is an incredible find! And the box is amazing! I have never heard of these. I searched and it went right to Grahame's wonderful trigger tube clock. So this is a 4 electrode trigger tube. Do tell! That box image is going to either inspire me or give me nightmares. My guess is both.
- Keith
Dekatron42
Aug 5, 2016, 8:30:55 AM8/5/16
to neonixie-l
The XC24 have two trigger electrodes, otherwise it's identical to the XC18 - you can wire two XC18s back to back with anodes and cathodes together to get the same function. I do have these in bulk packing but I've never seen the box for individual ones, it is really nice!
/Martin
Nick
Aug 5, 2016, 8:43:00 AM8/5/16
to neonixie-l
Whilst wiring two XC-18s together *should* work fine, it doesn't reliably as they two tubes would need to be perfectly matched, and they never are... Grahame and I both tried it without too much success...
Not fired up these XC-24s yet...
Nick
Dekatron42
Aug 5, 2016, 9:06:46 AM8/5/16
to neonixie-l
That's strange, I've built a few circuits from old magazines where the XC18s were used in just that way and those circuits never failed me. The only thing I can think of that I did that you might not have done is that I aged my XC18s so that I knew that they were striking and working within their parameters, however I didn't match them as I didn't read anywhere that it would be necessary.
In some circuits they used separate anode resistors but there was no explanation for that but they might have been there to compensate for differences in voltages.
/Martin
Grahame
Aug 5, 2016, 9:52:35 AM8/5/16
to neoni...@googlegroups.com
I did try matching the XC18s and they did work of sorts. But the slow realisation came that they didn't work in the dark. I've had no problem with Z700U trigger tubes wired back to back without matching.
Nick, for your next trick find a few boxes of Z700W dual trigger
tubes...
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threeneurons
Aug 5, 2016, 9:44:03 PM8/5/16
to neonixie-l
I've got a couple of the XC-18 tubes. Only 3 wires, but the same pretty box:
Dekatron42
Aug 6, 2016, 5:58:55 AM8/6/16
to neonixie-l
The fiddler looks really sad!
/Martin
Nick
Aug 8, 2016, 7:53:10 AM8/8/16
to neonixie-l
Two other, far less interesting, XC24 boxes...
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