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On Wednesday, July 19, 2017 at 4:53:41 PM UTC-5, John-Del wrote:
On Wednesday, July 19, 2017 at 2:57:18 PM UTC-4, Ian Field wrote:
"John-Del" wrote in message
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On Tuesday, July 18, 2017 at 1:37:35 PM UTC-4, Ian Field wrote:
jurbmail.com wrote in message
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On Monday, July 17, 2017 at 2:25:37 PM UTC-5, Ian Field wrote:
jamesgmail.com wrote in message
news:1a527a6f-6b49-454e-8fa1-dd1f71088fc4googlegroups.com...
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.

Its one or the other - delta is a bundle of guns and inline is exactly
what
it says.

Yep, misspoke. The porta-color used an inline gun but retained the round
RCA style shadow mask. When viewed up close, the round phoshpors looked a
lot like the earlier delta. Later in-lines (including the Trini) used
the rectangular slots that were quite obvious even when the TV was off.

It is totally possible to use inline guns with a triad type shadow mask.
In fact it holds its shape better than the slit type mask. Plus, with such
poor resolution (screen pitch) it looked better.

Those GEs with the AA and AB chassis' were not something I was in love
with to say the least. Had to resolder all those feedthroughs. Plus they
used a wafer tuner which is harder to clean properly.

I did make some money fixing them but you can't charge that much on those
elcheapo sets.

Actually though, it was very rare that I had to replace any parts in them.

Never seen an RCA TV in the UK, and I think the GE ones were co produced
with Hitachi.

Thorn Consumer Electronics standardised on RCA PIL tubes for a while. There
was a lot of re badging about - so hard to keep track.

One of the setups with RCA tubes used a low voltage flyback system - it was
hard to get transistors that could handle the current.