I'm going to turn this Knight amplifier into something like an ab763 without Verb or Trem. This is maybe my 4th-5th build. The PT is center-tapped. With 120vac in and using a 5Y3, I get 375vdc measuring between rectifier pin 8 and the center tap. Substituting in a GZ34, I should get a higher DC voltage reading because a GZ34 drops less voltage, right..? Well, it's exactly the same, and I dunno why. Any thoughts or gentle explanations of why I'm an idiot would be appreciated.