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Ur tv the high voltage it dead,the FBT,the flyback transformer.The big black block of plastic with a red wire with a black cap that hook up to the CRT(tv tube) is dead.The FBT,flyback transformer needed it to be replaced to solved this problems.Call the shops,take estimates for the best deal to do the repair.This is one of the main part of the tv to put HV in CRT(tube tv).It pretty hard to find this FBT these day,because of the discontinue of making of Amalog tvs.
if its a hi pitched whine it could be the horizontal output xfmr make sure all solder joints around the xfmr are solid and the xfmr mounts are tight it sounds as if your hearing the 15,750 hz. horiz. signal
No guarantees with this diagnosis. But it sounds like an HT ( high tension) leak This is often caused by the lead becoming partly unplugged ( being bumped or moved) and because of dust buildup it arcs making a high pitched hissing whistle.Ther lamp may also have been affected by the HT leak. The safest option for you is to call a service technician to it, as opening it up could cosntitute a a danger to the unskilled.
most likely it is the flyback transformer. I have had meny RCA tv's with a bad Flyback and H.O.T transistor bad. Cost depends on the service center. Parts average around $60.00 dealer, so depending on mark up and shop labor it could vary greatly. If you have never changed these parts it is best to have a service man do it ... Take it to the shop and save the trip call charge $49.00 and up to $125.00..
Confirm service # from back of set = F36650 YX01.......... Transformer red HV lead attaches to CRT & Horiz output xistor is on heatsink next to transformer = 2SC5148 ......... Rca part # 257805 or ASTI 2078 and 237470 xistor............ Do not use a generic transistor = name brand only............T.