What you have is the first year of the System 3 chassis.
Before that they used a steel chassis with modules.
This chassis was only built for one year the K line, 1979 IIRC.
You could get it in 19" & 25" with or without remote.
After that they combined the HV & power supply onto one
board with a very complicated design. The rest of the sets
modules were much the same. It was one of Zeniths best chassis.
The only improvement was you could get a comb filter &
digital tuning on the newer ones. Very reliable & excelent color.
I can not say anything bad about this set & I sold many of them new.
The main problems were:
Cold solder under the hoz drive transformer (9-153)
sometimes would blow hoz output.
Bad 24 V regulator IC.
Bad connections on 9-155 at outputs, CRT socket & resistor package.
Big cap across the power transformer ( oval one ).
Electrolytics in vert out.
Electrolytic in 200V supply on 9-153
A great find in Italy, must have come over with a military man or did Zenith
sell in Italy ? If I can help more feel free to ask.
best 73 Zeno
