Feel free to join us over on the Thiel Owners thread. Several fans of the 3.6 model for you to interact.
Obviously you've been happy for the past 40 years and I understand as I have owned Forte and Threshold Class A amps, so why not send the Forte 1A to Jon Soderberg at
Doing a rebuild on it will make it better than new and you'll be good for another 40 years. You could also have them rebuild the preamp.