My MA5B has given 15 years of perfect operation. But after a move, I first want to check whether everything is still in good condition before I install it back in the mast again. It's a good thing I did this check there was a big surprise.
Link for the Balun 50 ohm : 50 ohm 800 Watt
https://www.dg0sa.de/balun1zu1gross.pdf