A few comments on Sylvania sets from this era.
There were two major chassii & maybe some hybrids for value sets.
GT Matics introed an important feature, the hoz / vert count down circuit.
Basically there was a master hoz / vert osc that divided down the
osc. If you change channels you usually saw the vert blanking bar for
a few seconds before it snapped in. This became the industry standard on most better sets.
Chassii
1) IIRC the E-08 was 13, 17 & most 19" sets. Better models had the "Dark Lite" CRT & were in line CRT's. One board with plug in semi's & fold out chassis. Great pix on them & easy service.
2) High end 19" & 25" sets had a 3 module chassis & delta CRT's. They were
the ones with short CRT life. Looking back for a few years all sizes of
dark lite had the best pix out there. So why the bad CRT's ? IMO
they drove them too hard to overcome the dark glass. New sets on a
black scene had REAL blacks unlike others. The in line jugs seemed to handle
things much better.
enuf fer now
73 Zeno
LFOD !