This is the second one. The first one I built I never really got time to build a proper chassis for. My buddy has it powering his Klipsch RF-7 speakers. I was given a rather large box of matched P & N channel JFETS that are supposedly quite good, albeit NLA. At any rate, the man that has gifted me the use of them also kicks whatever other associated parts I might need if he has them in stock. Only stipulation being, he does not want me to sell or give away the parts. If I ever quit being interested in electronics, he will have them back. I do welding for him, occasionally over the last 25 years to now.\n\nAlso, I don't want just another Euro styled, or Chinese type universal chassis. Definitely don't want another black, blue LED amp either. Thinking a hand built aluminum chassis with wood trim. While I am waiting for the rest of the components for the power supply, I have time to think about it. Meanwhile, I have the board stuffed except for the MOSFETS. Will get to drilling and threading the heat sinks this weekend. That's the only thing I am really reliant on is factory made heat sinks. I have thought about making my own, or perhaps even liquid cooled, for having the tooling and experience to make those, I suppose. Maybe something unique will occur to me in the future. There are other amps I want to build, as well.\n\nHere's the boards for each channel. Some time was also spent reading the tiny printed values of those Dale resistors and testing them beforehand.\n\n\nThe heat sinks, which roughly measure 12" x 6.5" x 1.5" are without any holes for the boards. I think when I got these, diyaudio store was out of this particular size so I ordered elsewhere. Diyaudio's sinks has their proprietary, universal mounting scheme.\n\n\nHere is the PSU board awaiting parts. I thought I had bought them already, but I was mistaken. I am just going for the +\/-25V supply for the 25 watt version of the F5. I have higher sensitivity speakers that perform even with 3-4 watts. I may build the 50watt (F5 Turbo) at a later date.