Archie, I was forwarded this article on tube noise form Jim McShane and followed instructions on cleaning the sockets. Tube(s) were quieter at start up but fell back to a noisy state after 1/2 hour or so. I didn't have any DeoxIT so I used some CRC electronic cleaner, I will try again when I get some DeoxIT and see what happens.
http://www.audioasylum.com/audio/tubes/messages/25/253369.htmlFor good measure I ordered a full set of backup / replacement tubes from Jim. A Genalax U77/GZ34 for the rectifier, a Genalax 6922 for the input and 6N1P-EB's Voshkod a Rocket Logo for the outputs. I will let you know what I find once I get the tubes on Thursday. :)