Quote Originally Posted by Earl K View Post
From your measurements, it appears the "GPA treatment" is to turn a 16 ohm 604 into a 10 ohm 605 ( if that DAT measurement is to be believed )
Yep - that's what it looks like. I sent GPA an email - we'll see if they reply.
In the meantime, do you recommend another (more reliable) method for testing T/S?