Custom series was the low end but they were good sets as a rule.
During that era hi end was call Advanced System 3 & at the
highest end Digital System 3 sometimes with Bose audio.
This is not a digital set as now but digitally processed NTSC.
Modern Zenith model years start with A 1970, B 1971,
C, D, E, F, G, H, J, K, L, M, N, Y, Z, then A, B, again etc.
These are the regular line. Like cars they start coming out
late summer. Always a sales meeting with good food & all
the free booze you could drink before you placed a big order.
Decoding models is like this.
SK1961W
S=remote
K=model year (1979, may be built 1978 )
19 = 19" screen size ( like yours dosnt always stand )
61= level, higher ## is better
W= cabinet flavor. W= walnut. X= white P= pecan etc.
Any numbers after the cabinet are very minor changes service wise.
( SK1961W11 )
CTC177 is from the family of CTC175, 176, 177, 185, 186, 187.
Almost a 100% failure rate of bad PC cons in the tuner area.
Newer ones are better after some solder changes. Otherwise they
were very good sets & predictable. Google CTC 175 class
action suit.
BTW do NOT resolder it if there is no problems, too much can
go wrong ! Very small SMD's in a crowded area & I smoked a few in
my time !
73 Zeno
