05-23-2012, 01:42 AM
A type 75 tube needs a shield in most of the sets I have encountered, even cheap ones, without one the set howls like a banshee. A 6Q7 is normally a metal tube so it already has the shield built in, unless it was a 6Q7 G then it would need a shield, not sure about a 6Q7 GT.
Regards
Arran
Regards
Arran