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There was a shop around here who hated 169's and I told him, "Fine, I'll take everyone that you want to get rid of." He was always telling me crap like, "I replaced the HOT and the damn thing only worked a week, biggest POS RCA ever built." I thought to myself, "No, it's not a POS, it's just that you don't know how to properly service one." Knowing this guy, he was likely pulling used HOT's that were underrated off of junk boards
My experience with what usually happens is there are some small electrolytic capacitors in the power supply that fail and cause the B+ to rise to an excessive level. If you're lucky, the set will simply go into shutdown. If you're not lucky, the HOT will short and can also take out the power supply chopper transistor and the control IC. There is also a blue cap in the HOT area that will open and I've also seen diodes shorted in the HOT area, along with the bad HOT. It's also important that these parts be replaced with factory parts, if at all possible. Once you cover all your bases with the power supply and HOT, the set will usually run fine for years to come.
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