Question about trigger tube

[Clarke Payne]

Hi all,
I am new to the forum. I have previously built clocks using b7971 nixies.
I have been gathering parts for a trigger tube or neon bulb ring counter clock. After searching for the past few days,I have not had any luck finding trigger tubes,which I understand to be a neon bulb with an extra wire. The xc18 info I found lists no substitutes. I have a bag of ne2's and in3's. I was wondering if anyone knew of a russian substitutes for the xc18?
Any suggestions and advice would be very much appreciated. Thanks
Clarke Payne

[John Rehwinkel]

> I have been gathering parts for a trigger tube or neon bulb ring counter clock. After searching for the past few days,I have not had any luck finding trigger tubes,which I understand to be a neon bulb with an extra wire. The xc18 info I found lists no substitutes. I have a bag of ne2's and in3's. I was wondering if anyone knew of a russian substitutes for the xc18?

The ТХ4Б and ТХ3Б (often listed as TH4B and TH3B) are common small thyratrons/trigger tubes. However, I don't know how equivalent they are.

- John

[Tidak Ada]

Problem with these tubes is that the are only specified for 5000 hours, a
little bit more as half a year

eric

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[Grahame Marsh]

Hi Clarke,

Please be aware that XC18 based clocks fail to count reliably in
complete darkness - my experience with one clock but I believe
experienced by others. I'd expect two electrode neons to behave
similarly but I've no direct experience. My XC18 clock I keep as a
demonstration clock (to show off) so it only runs for a half a day now
and again.

Try to find some Mullard Z700U (or Z70U same part, different
maunfacturer). These have a 4 electrodes the extra one acts as a keep
alive or primer and so it should count in darkness.

Here's a datasheet
http://frank.pocnet.net/sheets/152/suppinfo/Z70UZ70W.pdf

Finally, there are a few books around that have been scanned and pdfed.
Do have Cold Cathode Tubes by JB Dance and Cold Cathode Tube Circuit
Design by DM Neale?

Cheers Grahame
Highlands Scotland