As some of you may have seen in my previous posts, I am in the process of building my first amp. It's a 5F1 based on the Boothill kit with a few minor substitutions from on recommendations here (e.g., different pilot light) and for parts that I happened to have on hand from recent repair projects. I've "completed assembly" and have everything together in the chassis. I'm following this start-up procedure: Without any tubes installed turn power switch to on and about 3 then plug in amp - pilot light illuminates and the fuse doesn't blow so that's a positive sign. Let it idle for a few minutes...no smoke, no smells. No shorts to the chassis, etc. Still no tubes installed. Measured voltage across pins 4/5 and 9 on V1 filaments at 7.21v. A little high but doesn't seem like anything to worry about at this point. Unplug amp, turn switch off, drain caps using snuffer stick, and installed new TAD 5Y3GT. Plug amp in, power on. Rectifier tube glows a pleasant orange. No smells, no smoke. Voltage at pins 4 and 6 measures 349v and voltage at pin 2 measures 5.37v. Here's where the problem comes in... When I then move to measure the B+ at the positive lead of the first cap (C3) before the voltage dropping resistors (R10) I get essentially nothing. I thought it might be a problem with the lead from pin 8 of the rectifier tube (V3) to that post but I get the same bleh reading on pin 8 directly (B+ DC out). Thoughts?