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...

Grahame

On 05/08/2016 14:06, Dekatron42 wrote:
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

On Friday, 5 August 2016 14:43:00 UTC+2, Nick wrote:

    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

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