On Mar 4, 8:39 am, N0UU <[email protected]> wrote:
> A HV kill/activate input line would be nice.  These priceless tubes
> have a lifetime and I would attach a motion detector to activate the
> display only when someone was looking.  Would keep these around longer.
Paranoia.  I built three clocks (18 tubes) with B7971s that have been
running 24/7 for 30-35 years without failure.  I might have gotten
lucky, but I did not do anything special for reliability or to extend
the operating life.  My only concession to that issue was to purchase
spare tubes that are still waiting to be used.

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