> Perhaps the connection from an inductive device is providing some sort of
energy spike in the 6.3 v.a.c. transformer supply that isn't there in the
other supply?<
It could be, but my guess is that it's the difference between slowly ramping
the DC supply up and holding it at somewhat less than the bulbs' rating and
just banging them straight across a low-impedance AC source that accounts
for the very different life.
73 John
GW4FRX
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