Saw the posting about Antique Electronic Supply. I just bought
a spare tube set from them for my recently restored 1934 Atwater Kent
cathedral radio.  Here's the skinny:

  Antique Electronic Supply
  6221 S Maple Avenue
  Tempe, AZ 85283
  Phone: 480-820-5411
  Fax: 800-706-6789
  E-mail: info@tubesandmore.com
  Website: http://www.tubesandmore.com/

Good luck!

Bryant S. Stott