Glenn
The GL's are probably the best of the new production but if you want to try NOS then call Andy at Vintage Tube Services. If these are driver tubes and not the input tubes and you want to risk E-bay then look for the tubes marked Baldwin or Conn as they were all screened by the organ companies before being installed and even used they will last for years. The most common will be the green label Baldwin which is a Sylvania from the early 60's. I used a pair in a Rogue and a Music Reference amp.
__________________
Jack
|