[Chas]

Probably a miss-connection of a replacement capacitor to either the ground or chassis. Possibly C-14 or C19.

This radio/phono uses both a B- and a chassis "ground", Any measurements taken for radio phono operation are to B- (rake symbol) not chassis.

Note this radio/phono uses a voltage doubler power supply. The two caps C15, 14 should have a low ESR rating. If not they will be subject to heating and under loud music passages, the B+ will fall off, bass will be flat. The schematic shows thse caps with a "cup" like symbol. Long ago that symbol meant wet electrolytic literally a borax solution electrolyte. That, type of capacitor had a low ESR and was capable of passing a much greater amount of current than the "dry" types. The wet (liquid) is long gone replaced by improved plate/paste electrolytes but with design cost differences the low ESR type is not as common and costs more (processing). The application (in the radio/phono) has not changed. Low ESR is still required. BTW this type of cap is also used in certain radios where there is a slow warmup and the power supply comes up before the plate loads, voltage soars, the wet electrolytic can take that surge.