Silver Supporting Member
So are the only real differences the ground switch being obsolete, the modern power tube cage, and the components being PCB mounted instead of handwired? Just curious as I have a '67 BF, '78 SF, and a new '65 PRRI and can't hear much of a difference between the BF and the '65 PRRI. The treble seems a bit higher, but you can tame it by simply turning the treble knob down. Any other notable differences? Any component values that changed?