My condolences. I've spoken with and received valuable help from John in the past. He was always friendly and extremely helpful. I have a 250/250 amp that I modified heavily. The traces on one channel's circuit board were damaged from the previous owner. I called John, spoke for some time about my modifications, which he appreciated. He told me he had some spare unstuffed boards available and sent me two. He actually offered to provide stuffed boards, but I said it wasn't necessary.
He was nice to me and Engineer to Engineer, he appreciated the upgrades I made to the amp.
He will be missed.