[drh4683]

This is very true regarding the HV regulation. The 20Y1C48 is basically the exact same chassis. Lots of times, the flyback runs very hot on these sets. The problem off HV regulation loss is an open .22uF@600v molded cap and a low resistance 220 ohm 1/2 watt carbon resistor paralleled to ground in the cathode of the 6HS5 regulator. Change those, and the set works fine with good HV range of the HV control. Ive probably had 10+ sets that used the 20Y1C type chassis and about 3 or 4 had HV issues caused by this bad cap + resistor. After being replaced, the set works fine and you can put it to daily use without worry that it will fail again.