In this case they didn't show what they actually did to make the radio work. It did show a bunch of deteriorated insulation and a tar filled box full of capacitors. I saw they heated up the tar and extricated the contents. I wonder though, were those caps actually bad, the ones in the tar?
I didn't get to see that one, but....................
Very few of those power supplys with original caps survived. I have 5 AK socket powered radios in my collection (and 3 battery sets) 4 of the 5 have had to be "recapped". I have gotten pretty good at it and it is not a job for the faint at heart.
It is stinky and smelly and best done out in the garage on a breezy day. One of the problems that you run into is after seperating the caps from the chokes and witing up new caps, then stuffing it back into the can is that you ALWAYS need more tar to fill them up. The late model caps take up far less volume than the originals.
Also the big trick is to heat the cans up slowly and gently so you melt the tar all of the way through before attempting to grab the leads and pull the gutz out.
the one that I have that survived intact is the one you would have least expected. It is a Model 52 and the power supply can was so rusty that the mounting feet had rusted clean off of the bottom of the can. Go figger!! There is definately no ryme or reason to it.
the nasty job of repairing the power supplies is the big reason that the AK metal box sets dont bring a lot of money to collectors or at collectors auctions and sales. And, I have gotten paid pretty good money over the years to repair them for other collectors.