[Jim Dutridge]

Ron, this is the early version with the dual control. I did not test the tubes originally but just now I found the 47 was weak and the 27 started out OK then started to fade. I also noticed a tear in the cone and along the surround. Both were not readily noticeable until I slightly depressed the cone. I currently have repairs drying on the speaker and will test it along with 2 newer tubes later tomorrow.

Terry, thanks for the links. I'll peruse them later tonight.