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47uF should swap for 50 just fine. Most lytics of that era were -50%/+100% tolerance. Even some of the more finicky circuits should not mind the roughly 6% difference there.
In the late 50's-mid 70's the 'old' standard value system of caps phased out. The values used to be 1,2,3,4,5,6,7 (maybe more), but changed to 1,2.2,2.5,3.3,4.7,6.8,8.2 (all numbers were available in various powers of 10).
In radios and the audio and PS sections of TVs go with the nearest modern value and everything should be fine. In other circuits of TVs that may apply with the caveat of if everything else checks out, but it should work better than it is, try to better approximate the original values....
If I'm replacing say an 80uF lytic and I don't have anything bigger than a 47u at the needed voltage I usually put a 33 in parallel with a 47 to get 80. If you keep a good selection on .00x and.000x caps it is easy to get a more exact replacement for most odd ball papers through parallel connection.
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