Joat42 wrote:
Then there is the other problem if your tech-base is much more advanced (ie. several generation later) you aren't going to repair the old stuff, you are practically forced to replace it equipment with new. For example, if you take a TV-set from the 1950s that's broken down it may be cheaper just to buy a new one instead of trying to get someone to repair it.
Very bad example.
Old TV's are very easy to repair and calibrate. There is a reason there was a TV repair shop right next to Radio Shack or in the same store usually. Now the number of people who still know how to do this quickly and cheaply is decreasing drastically as modern electronics one literally cannot repair unless one has the schematic on hand whereas old electronics one could easily trace. Any electrician technician will be able to easily recalibrate a TV. Old TV repair requires a screwdriver and often a replacement capacitor... A newer CRT screen is actually much harder to repair than old CRT's as things are embedded in silicon chips instead of placed on circuit boards easily accessible and traceable. Though generally all one had to do was a quick check of the caps, and then recalibrate. 10min max later, viola, good as new.
We still calibrate our old ancient CRT oscilloscopes as their lag is vastly lower than anything "modern" even though they cannot store the wave form. If we want to store, we send the signal out of the scope and to an A/D converter tied to computer. Could do the exact same thing with Computer CRT screens and have done so. Take lightly used top line used 21" or 24" screens have quality far surpassing that of LCD. Get them for free. True, the phsopors inside the tubes have degraded but they will still be flawless otherwise. Last couple of years have seen LCD surpass CRT in terms of resolution, pitch, and color, but their lag is still abysmal. This will be surpassed very soon.
A better example would be repairing steam engines. Why? Give a few more years and no one will know how to weld fixing the pressure vessels, burnners, etc. Of course, anyone with half a brain cell to rub together will easily see that a modern engine replacement will be far more compact, efficient, and quiet and simply replace-move on.
The problem with the SD's is the same problem faced by the Iowa class Battleships. If you want a good laugh, read naval forums where old nostalgic farts try to "fix"/replace, the BB's boilers which are dead. All that armor literally makes it impossible to replace components deep inside the ship. Sure, it could be done, but it would be slightly more expensive, and just as quick, assuming there is a design, to build a new battleship without all the maintenance incompatibility nightmares. Of course the armor scheme is still obsolete. SD's armor on the other hand is not obsolete. Not as good as modern stuff, but not obsolete. So maybe they are really only tough BC's. Not exactly a bad thing. Better than a LAC rowboat with a praying priest at the helm defense.