Quote:
Originally Posted by larschr
I would say it depends on what you want the old set for. If you just want it as a display piece, it wouldn´t really matter as long as it looks good. If you want to have it as a historical item, i think it does best in working condition. Personally, i would turn it on for a couple of hours at least every second week. If you want to use it as your main set? Well, why not? If so, it might be a good idea to keep a little stock of spare parts, like flybacks, power supplys and tubes (if any). It is also a good idea to replace all electrolytic caps and the resistors that has visible "wear" (heat damage, the outside coating flakes off), and to check all soldering joints, specially on the hot places (big resistors, output stages, flyback etc.).
I have some old Philips sets in almost daily use, and i rarely have problems. However, some electronics knowledge, some test equipment and last, but not least, the schematics/wiring diagrams for your TV(s) is always nice to have.
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I have a 1976 Philips K11 color set as a daily watcher since 1995 and the only problem i had with it was a sudden loss of convergence in early 2003, due to a few broken solder joints
I also have some other 70s Philips color sets, with K11, K9, KT1, KT2, KT3 and KM2 chassis, and they are all very reliable, i have yet to see an original early 70s to mid 80s Philips CRT with a weak gun... the ones used in arcade games or railway monitors may have severe phosphor burns but strong guns...
Instead, their K12 modular chassis did have severe reliability problems due to the placement of high power circuits like E-W correction on plug in modules, their slots would fail and fry over time... but they're easy to fix... just hard wire the fried connections from the power modules to the motherboard...
Another mod i'd like do advise on a digitally tuned K12 chassis is the replacement of the memory backup battery with a 5.5v 0,47F supercapacitor, to avoid corrosion damage to the control module due to the backup battery getting leaky.