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Plenty were replaced, and I think that in a time when a typical family had one TV, excess usage took its toll. I repaired plenty of early & mid-60s color sets during the 80s & 90s, with original CRTs. So it's very feasible to say that a 21FJP22 could last 20 years with moderate normal use. I think that lots of CRTs were replaced unnecessarily back then. Easy job; big $. Typically it would bill out at around $200 to replace a 21" color tube in the 80s, and a rebuilt tube was $39.50 cost. Time to install & align was about 30 minutes.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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