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Original written by Don Lindsly: I worked on a lot of those Philco TV123 chassis. Many of them ended up in executive's and dealer's homes.... Philco provided a massive modification kit for that set. It called for a sub-chassis to enable 2 5U4s to replace the 5V3, totalling 3 LV rectifiers.
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Re the 'massive' retrofit kit, which included a subchassis that replaced a 5V3. I know the reason for that part of the kit. The original rectifier sockets were on the power transformer. According to the original owner, a Philco dealer in Egg Harbor City, NJ, the 5V3 and 5U4 got so hot the solder in the pins would melt. He mimicked the kit with power-cable wire and old sockets to move one rectifier off the transformer. This ‘remote’ socket with its 5U4 was still inside the cabinet when I got the set.