5y3 rectifier tube in my 5F1 tweed champ went dead a month ago. and everything was fine after I put a new 5y3 tube.
then, the same thing happened today. I figured out this 16uf 450V Astron minimite filter cap was the problem.
Sprague 16uf 475v fits Astron Minimite 16uf 450V paper sleeve. my champ sounds firm and clear than ever with this new cap.
You need to strip off the blue shrink cover to put it in the paper sleeve as you can see
Sadly, I’ve lost 2 of these 5y3 tubes from this issue. but still good with the better sounding from this small tweed amp.