Dale said:
>I can only say I've replaced more incandescents (>10)
than LED's (0) due to simple burn out in the equipment. <
The incandescents I've replaced in the last 20 years were ones run without
surge protection in Yaesu equipment, and some in a boatanchor receiver that I
was restoring that hadn't failed but had evaporated a fair amount of filament
onto the glass. Theyw ere only 45 years old. In my home brew equipment, no
failures in that time. Now this may well be because I use series resistors and
so minimise the switch on current surge, as well as purposely under-running the
bulbs by about 10%. In the same period, I've had 3 tube failures (one of them
was WW2 5R4GY!) and some 17 transistor/IC failures.
Of course, not all semiconductor 'failures' are. Many years ago now, a customer
returned 6 brand new ICs from a batch which he said, all failed. The failure
was 'no function, logic levels wrong'. However, the device in question was an
analogue AM/SSB detector chip....... and they worked perfectly to the correct
test spec in the correct test fixture.
73
Peter G3RZP
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