I am restoring a Knight Kit Star Roamer. It uses a unique 4-in-1 electrolytic capacitor (brand name Lil J) that has values of 30-30-30-50 mf. Before I replace it with 4 individual electrolytic caps, is anyone aware of a modern 4-in-1 replacement for this? I've done a bit of web research and it appears that 4-in-1 electrolytics are no longer made.

CE Manufacturing makes new twist lock multi-section capacitors using the original machinery (expensive). I see that Antique Electronic Supply sells them, but I do not see the value you need. I would simply open it up and restuff it using 33 and 47mfd 160 volt radial lead electrolytics. If there is not room for all 4, one or more can be tacked in somewhere. There are methods for restuffing documented on the forum. Search using GOOGLE, site:antiqueradios.com

If you use the smaller, flat, polyester film green-colored types of caps, you should have room for 4 in the original can.

If that is a cardboard cylinder with wires, AES has the triple capacitor, and the fourth capacitor may be a small cathode bypass that can be hidden by the output tube, no one will notice.
Don

I think they need to be electrolytic types. I have never seen a film capacitor with that high a capacitance. But, I have not seen everything either!

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Of course; I didn't pay attention to the values. Never seen that big of a "greenie" either. Good luck.