On Tuesday, July 18, 2017 at 1:37:35 PM UTC-4, Ian Field wrote:
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On Monday, July 17, 2017 at 2:25:37 PM UTC-5, Ian Field wrote:
jamesgmail.com wrote in message
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I need help

If its that bad - you probably need to sort out the purity first.

I didn't think RCA PIL tubes still had those.

What is a PIL tube ?

May have been a copyright dodge to avoid the Trinitron.



Perhaps, but I think most of Sony's engineering efforts were to avoid everyone else's patents. Their 70s power supply designs are a Rube Goldberg's nightmare wrapped in a chain saw wielding mass murderer's warm embrace. They weren't notably efficient or particularly well regulating, so my guess is that they were building a unique design with no patents (and really, who would patent such an abortion?).

I remember when NYC was reducing power during the 70s in an "energy saving" attempt. Well Sony power supplies committed harakiri at not much less than 100VAC, and lots of Trinitrons were blowing up during the brown-outs.

As far as in-line tubes, I remember seeing mid 60s GE Portacolor TVs use in-lines although I believe they were of delta configuration. Decent tube, easy to converge and outlasted the TV but the TV itself was a toilet. Terrible picture that would feature not only changing black level and AGC action but even change in color temperature as the brightness was advanced, and this was at the demodulators, not the CRT.

The Trinitron when it worked right produced some fabulous images, but I think the tube was very finicky and required far more stringent manufacturing tolerances than the typical tube, hence the cost. Give it a small nudge and the shadow mask would shift or one of the wires would snap. Early tubes had the coaxial second anode connector and those tubes would short internally.

Don't miss those days. (much)