Am I crazy... or can a hear a difference in my 67 Super Reverb between a Weber Copper Cap Rectifier and a good old GZ34 Rectifier Tube? I've been running my SR with the copper cap because according to Weber in runs my original OT at a lower voltage and extends it's life. I've had it in for months now and all has been well. However, just out of curiosity, I popped the GZ34 back it tonight and man the amp sounds so much better (to my ears). Anyone???