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#31
08-20-2013, 08:30 AM
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I think on average jugs from the late 60's til late 80's
are lasting a long time. B&W's from abt 1960 on also. New displays are super complex & delicate. CRTs are simple & have a long history of improvements. If you make a CRT to last an average of 10 yrs many will have to last 20yrs and more to accomplish it. When a set got replaced it was usually 8 yrs old & still had a good jug, it got patched up & put in another room. When it crapped out again it ofter went into the cellar or garage. So the TV sees 8 yrs hard use, 5 yrs low use then sits for years idle. Some do hard time. I had a top-o-line M-line Zenith 19" about 1981. I sold it a few yrs later. He ran it til mid 90's & gave it away. Abt 3 yrs ago it got junked still working fine. I know it isnt a rare thing............ 73 Zeno 
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#32
08-20-2013, 02:23 PM
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Like was said, use em for noise! I have many customers that say they can't sleep unless there is a TV on in their bedroom. Years ago I had a couple that had a big box projo that stayed on 24 hours a day. They couldn't believe they needed CRT's replaced every year because the phosphor was dead.
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#33
08-20-2013, 03:44 PM
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My story on roundie CRT's is the Zenith 25MC33 chassis combo I grew up with. TV was "on" from about 9 AM to Midnight 5 days most weeks, and every other Saturday. Sunday, not so much during the day , but we never missed Wild Kingdom, Disney and whatever western was on. 1st CRT lasted from 1965 to 1970. Second lasted 1970 to 71 then 73 to 74 with a new Hi Lite tube (2 years total). Was replaced again in 1976 with a worn rejuv'd 21FJP22 from and old RCA set by me in High School. The constant on condition was not noise. One of us 4 was watching at all times, between evening shows, sports, soaps, game and talk shows.
The chassis still ran after that but with lots of snapping and popping. Very lightly used after that till about 1981. So 5 years and 2 years each on 2 tubes with average 12 hours daily use, combined with other minor chassis repairs. Compare with a Sampo 19" CRT set from a discount store purchased in 1982 or 83, that lasted until 2003 with only a jungle IC replacement 1 year after purchase. Also, my parents had another cheap set, a Portland brand 19" "off the truck" in a parking lot that ran about 15 years, with no repairs. The cost of both was about the same as the first CRT replacement in the Zenith (other chassis repairs had to be done at the same time). Both of those sets developed focus problems late in their lives and were discarded. Both sets ran 10-20 hours a day, 7 days a week. I'd say that's fair service, and a big improvement over the roundie, much as I like the old Zeniths.
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#35
08-21-2013, 01:24 AM
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Up till 3 months ago, I worked on flat-panels tv sets EVERY day. I Mainly did the "board repairs" and was the "high level tech" to come to when the "kids" were unable to "fix" a set, by routine board replacement.
I saw a LOT of bad panels. More bad LCD panels than plasma sets, but plasma sets were NOT reliable at all, and often needed multiple boards, such as the Y-buffers AND sustains, to fix. Many of the panels we saw bad, had bad backlights, with CCFL or LED strings out. Some just would not "work right", and a common problem was "panel separation" in where the front electrode connecting the panel to the T-con or main board, would separate from the front of the panel, ruining it. This was NOT "soldered on" in the normal sense, but ultrasonically soldered, and we had no way to repair this. This usually happened after 6 months to a year of use or so. SO...NO the flat-panels are NOT NEARLY as reliable as the classic Solid-state sets, such as the Zenith CC1 flat chassis SS or CCII or the RCA modular XL-100 series from 1971-77. And the picture tubes , in general, lasted as long then, as about 3-4 flat panels will today.
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#37
08-21-2013, 02:30 PM
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Well...Companies even back then were all about cutting costs to the bone. You gotta know that for every engineer who was talented & proud of his work, there was a beady-eyed bastard Cost Accountant who was all over him all the time to cut this corner, leave that IF stage out, make the coating/rare earths on the picture tube a few microns less thick... Sure the resulting mess WORKED, but for how long, & at what price to reliability ? The round CRTs prolly didn't see too much of this, but I'll bet you a chicken dinner that the rectangular tubes had been "Doctored", "Cheapened", "Played with".....Sometimes this monkeying around w/things DID result in improvements, but most of the time it was strictly a cost saving measure... And, when color TV really did take off in the late Sixties/early Seventies, mfgers were under IMMENSE pressure to crank out as many as possible-The Dealers can fix 'em in the field...And we can't forget our old friends in the Gummint...Maybe a certain phosphor or process was THE way to REALLY make a good CRT, but the phosphor in question made Yellow-Bellied Sap Suckers' Tail Feathers fall off...Gasp ! Horrors ! Can't have THAT, so that chemical was forever banished..
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Benevolent Despot
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#38
08-21-2013, 03:07 PM
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Kind of like "lead free solder" it works SO well....NOT!! LF or "RoHS compliant "solder is one of the big problems with modern electronics. It does NOT hold up NEARLY as well as the "good stuff" and even tends to grow "dendrites" and short out other connections on boards, connectors, panels, etc. We did NOT use this where I worked.
Or those "wonderful" CCFL bulbs that "last SO long"....sometimes...not often though. Or the new "substitute" grease in MCdonalds fries...thy do NOT have that "magical taste" anymore.... But remember..."it's for the CHILRDEN" after all...should make you feel good....
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#39
08-21-2013, 03:24 PM
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Quote:
And let's not forget the "mini necks", those tubes , from the late '80's till the end of the tube era.NO doubt a cost-cutting measure. The necks were even smaller than the normal color tubes of the time--and they did not last nearly as long. They did NOT take rejuv. very well, either....Philco attempted this in the early '50's, with the "neoscope" a very early mini-neck BW tube--evidently it did not work well...but the concept was revived for color with the Zenith trri--potentials in the mid-70's and taken farther by the 1980's...NONE of them last too long!! However...some of the rect. tubes, like the Zenith CC tubes were made to LAST, as we know. SO were the HItachi tubes made in the late '80s to the early 2000's. RCA used them....and they last almost as long as a CC tube. OTOH, THe Zenith LG tubes, from about 90 or so till 98 or so...is an example of "cutting" gone WAAAYYYY too far. 3-4 good years was the BEST one could likely expect from one!!
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#42
08-22-2013, 01:19 AM
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SUch tubes do exist. They have been spoken abut here. something like "19gvp22" or so. I think they are ALL R.E. and maybe even matrix. I expect the cathodes would be VERY heavily evaporated and thick. Not sure if they would have that "Magic color" of a 21FB or 21AX but they would likely last as long as a CCII tube!! Probably cost the taxpayers over a grand each new, too.
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#43
08-24-2013, 04:45 AM
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Last year, they replaced the radars. The new monitors installed are 25" flat panels. The captain was telling me about the price tag on those displays... 8 grand a piece! Damn... for a 25" screen! I suspect it has to do with being built sturdier and able to withstand the environment of a ship. The TV sets in our rooms are typical 30-40 inch Samsungs. They start looking questionable after just a couple of years. The PC's we use have cheapie monitors... they don't last long, either.
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Charlie Trahan He who dies with the most toys still dies.
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