RCA distributor that existed in Harrisburg picked up and moved 40 years ago, now they "distribute" HVAC equipment. If only we knew where that stock of parts went
My "local source" is Moyers Electronics, surely is not predatory as some of these tube sellers are, try them for any RCA part number within reason, that is to say: they are out of many common flybacks, yokes and CRT's. The Pottsville store has every cable or jack Ill ever need, tools galore.
Moyers in Sunbury has many surprises like a NOS $25 output transformer for an RCA RS177 PP 6BQ5 amp.
Try finding THAT deal on the internet. Every Sams set, IF trans, or vertical blocking transformer I have ever needed was found as a Merit or Ram, many other coils etc that you might otherwise not find.