Hi guys, 25 years ago when I was 15 my dad gave me 2 vintage amps which he found buried away in his pub. A black 1973 50W JMP and a 1976 MKII 100W Super Lead in fawn colour. I immediately used the 50W blackie for a few years and loved it because it was loud (I was 15!) but the 100W blondie was in a state of dispair and strangely modded so I didn’t touch it to this day. Both amps have been in storage for over 20 Years and I recently dug them out for servicing and repair so that I can get them both singing again. My question regarding ‘blackie’ is that I don’t understand why the previous owner took out the channel II lead sockets? Why would you want to remove them? I understand that he removed the polarity switch which is fine, i get that, but why the inputs? Is this a common mod that improves something? I’ve included photos of the wiring so that you can see what he did and possibly why he wanted to do it. Is it an improvement or a botch job? I can see wires wrapped in bits of tape which looks pretty shabby and i'm wondering how far off from the original wiring this is? Plus what valves are these? I don’t see any writing on them and I’m no expert. Your input on this is greatly appreciated.