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
http://vintageamprepair.net
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.
http://vintageamprepair.net
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.