Update: It works! Couldn't help myself and fired it up, played first go!! Need a bit of Voltage help! I've followed Rob's amp startup procedure with no burning/sparking/etc so far! I'm up to step 6 and noticed I have high B voltages. Voltages are: 440/420/312 I'm guessing this is because of the rectifier tube that came with the kit (5AR4 instead of a 5Y3) AND/OR because the power tubes are not yet put in. Any experts out there able to chime in on if these voltages sound right for no power tubes/speaker hooked up with a 5AR4 rectifier? I am getting 335VAC at each of the rectifier input leads (pin 3/5 before on my setup, before the diodes) As for the next steps should I: Still proceed with power tubes and speaker then re-measure Replace the 5AR4 with a 5Y3 and repeat tests before proceeding Do something else entirely Thanks all who've help me get this far! Here is my exact layout, B+ Voltages show are from the "Standard 5e3 voltages" image on Rob's site, not my own readings. PS. Using all my willpower to step on the brakes.. LOL so tempted to put the tubes in and just see what happens!