[Hallicrafters] SX-73 / R-274 Starting Resto

[hwhall at compuserve.com]

 >
general consensus  is they probably have pcbs in the oil, like oldtelephone transformers, so I would recommend you don’t open them torestuff
>

If interested in restuffing, drill one of the suspect caps to extract a few drops of oil. If the drops sink when placed on water, they may indeed be PCB types but it they float or spread on the surface, they aren't.  PCB oils aren't like radioactives, mere proximity isn't a hazard.  Just don't ingest/inhale it or mop it up barehanded.  All the tub caps in my RBM-5 turned out to be common mineral oil and yielded maybe 1/8 cup of oil total or less.

Wayne
WB4OGM