Also check the flat resistor pkg on the 9-155. When ever
you see one check for PC cons.
Quick check on almost any in line CRT set is:
Measure DCV on any of color output collectors.
This is the CRT cathodes. Normal pix will be in the
120V range. If that goes way up when the pix darkens you have
a video problem. If it dont its almost always G-1 or G-2.
Remember low cathode =brite, high cathode = dark.
One other thing that goes is a 10mfd 415V 'lytic on the
right rear of the 9-160 near the FBT. Its the filter for the
200V supply for the outputs. Very common on all brands
but usually gives different symptoms.
good luck
Zeno
LFOD !