Hi everyone, I've been busily undertaking the restoration of my Kenwood KA-9100. Many thanks goes to all of the amazing minds on here who've posted about their rebuilds. I have ordered the replacement of all trouble transistors/diodes thanks to AK. This mainly just a me-too post, but I'd like you gentlemen to monitor/offer suggestions and give me a hand if I get stuck. My approach is more let's get down to business, I tend to leave stuff alone unless it's problematic/recommended to be replaced. I will be doing a Triac mod later. I'm only left with the control boards to recap as I've already undertaken the protection/diode board rebuild, power supply, power amps and replaced the main power supply caps with an amazing set of Nichicon KG Gold Tune caps. 15,000uf 63 volts. Whoever was in here before replaced one of the originals and while it the same value, was slightly smaller in physical size. Second from the right in the photo below. The rest of the caps are been replaced with Nichicon Audio grade caps. Mostly FW series throughout the amp (or whatever audio grade is available). I've kept all voltages and capacitances the same. The control board is getting totally re-done with FG series. The only general purpose caps i've ordered are for the meter driver board Previous owner/owners did a horrible soldering job on the diode boards, you guys should have seen how this looked before I started cleaning her up. The best I could do, the right hand side in the photo below came up really nice and despite damage to the trace on the left, I was still able to lock it down tight without having to improvise a repair job. The solder damage to the wires was not done by me On the diode boards transistors replaced as follows: Q1 2SC945 replaced with KSC1845 Q2 2SC1212A(C) replaced with KSC2690A On the Power amp modules, all caps replaced and as per recommendations on this board, the following transistors: Q 5 through to 8 is 2SA912(R) supposedly underrated, replaced with KSA1220AY Q 11 to 12 is 2SC1885(R) or (S) supposedly underrated, replaced with KSC2690AY And Potentiometer 2x 3299Y-501LF-ND And just this afternoon I completed the power supply board. Of particular note was Diode 5 next to the relay. This diode went bad some time ago and would not allow the Kenwood to come out of protection. I pulled it out, it fell apart and the amp started coming out of protection again without the diode in there! I made another post about it here: http://audiokarma.org/forums/index....ge-despite-protection-circuit-rebuild.773654/ It was replaced with a 1N4004. Zener diode YZ-140 was replaced with 1N5244B. I left the transistors including the TO-220's alone as these don't appear to give trouble unlike some Pioneers and other models. I think Kenwood always got it right with their PS boards, but if I have a freak incident one day, the following are much higher rating Balls to the wall types: Q1 2SC1983 replace with TIP122FS-ND Q2 2SA755 replace with BD244C But I've decided to save those for a rainy day. And relay S51 4030-05 was replaced with good old Omron MY4-02-DC24. Dead pins cut out so it could fit. They went flying all over the place but the Kenwood is more important. The vacuum cleaner will get those later. I also touched up the solder on the main PS connecting pins as some of them looked like they didn't have enough solder on them. Don't want something to crack and I've heard of that happening a few times. The ones on the left already done, the ones on the right in this photo show how they looked. Some were even worse than this before I thought I better take a photo. Besides the Power Supply board I did today (the amp working like a dream) the other work was done about 5 months ago and I got busy with work and other things. Now comes the disassembly of the front to gain access to the control boards. I start Saturday afternoon/evening Australian time. As others have said, a Royal PITA, but I live for this stuff and want this beauty to shine. I welcome your suggestions. If I'm doing something wrong or could do it better, tell me. Be blunt. I'm here to learn and want to get it right. I'm 31 years old, so help me keep the dream alive hey?