Repairing an old Singer portable BW TV .. general capcitor question

[leonk]

I recently purchased a 1960's portable TV (branded by Singer, but made by Mitsubishi). This TV uses diodes and transistors! It shows full screen, but I can't tune to any channel .. so I assume there's something wrong in the UHF/VHF board.

I've taken the TV apart, and at this point figured I'll start by replacing all the capacitors in it.. but I ran into a problem.

All the capacitor values are non-standard ones! 2,3, 5, etc. uF 15V electrolytic capacitors.

In the past, I've repaired a couple of TV's and Arcade machine monitors .. but for those, I was able to find capacitors.

When someone run into this kind of problem with these old TV's, what do you do? Will you put a 4.6uF capacitor instead of 5uF, or 5.2 uF (assuming these are real values that I can easily find).

I remember the old arcade machine monitor repair guys frown a lot about changing uF values, but have no issues with moving voltage up.. (up to a point I assume.. 50V instead of 15V should work, but I shouldn't try and put in a 600V, right?)

Lastly, There is one capacitor that looks almost like a match box, and is just as big (big yellow box with with 2 leads on either size) and is marked: 7uF (K) 50WV.

My concern is with this one.. 7uF 50WV is not that big.. why is this one so huge? Also, 7uF? What a strange size.. I can't find it ANYWHERE...

Please advise how you would handle this..

Thanks.