Hi Lee,
Good point.
Two comments:
With pre-planning, this parts obscurity dilemma can be mitigated
significantly by selecting more popular parts sharing commonality. You
mention displays....a perfect example. 7" displays - a globally
standardized size - are here to stay in a variety of different industries.
A lot of this has matured now to the point where when one part becomes
obsolete, another identical, or near drop-in replacement post-dates it.
Switch-Mode power supplies are one, and FET's are now another. For
instance, from just quickly looking at the two data sheets, the ST Micro
SD2933 (released in 2004) and the SD4933 (released in 2009).
Dan KK3AN
L L bahr wrote:
What turns me off to Solid State is the fact when you need replacement transistors, they
most likely have become obsolete. I'm tired of it. Same with displays. You need to
throw the radio away because the display that went out is no longer available. Screw all
this new stuff. I'll use my Collins and Drake rigs with a L-4B, L-7, SB-220, etc. At
least the Chinese 3-500Z tubes hold up. Anything using 572Bs these days are disqualified
from being used in my shack. I'm off this "buy a new rig every year" Merry Go
round.
Lee, w0vt
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