Yes, I communicated with him-- thanks. The unit weighs 86 pounds; I could remove the amp and transformer and send it for repairs, but with shipping and repairs it will be several hundred dollars and I'll still have a 20-y-o subwoofer (btw, the hum seems to get louder by the day!)
Any ideas who I should contact, or what part of this forum, to see about a good modern replacement for that monster speaker?