Nooby problem. I've been trying to complete a 5E3 build with no success. It's a Ceriatone 5E3 complete chassis. I only had to add the tubes and transformers. I'm using a Weber PT and a Mercury Magnetics OT. Both are brand new. After connecting the iron I get the correct voltages to the tubes, heaters, etc. Checked my wiring , again, and again.... Tried different known good tubes..... I still get no sound. How do I test the OT? What readings should I get? Thanks for any help, including the name of a Norcal amp tech possibly.