On Wednesday, March 29, 2017 at 8:50:15 AM UTC-7, gregebert wrote: > > I have clocks with other tubes (6091, IN-18, and coming soon, b7971), but > I can tell they dont have the same ruggedness. > I am not sure what you are expecting, but I have had no longevity problems with my B7971s. By now, the three six-digit clocks have been running 24/7 for 40 +years. I did nothing heroic to "protect" them, using plain old carbon comp resistors to limit the cathode currents from an unregulated power supply. The tubes were surplus from John Meshna, so I assume that they already had been in use for over 10k hours (estimating about 2k hours/year). My only B7971 failure occurred when I dropped one about 1 meter onto a concrete floor.
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