Fresh AA1164 build, fired it up for the first time and no sound. no hum, nothing. Only sound I've heard so far is when I touch the meter probe to the output wires on the power tubes (blue/brown wires to the PT). All the voltages are perfect except for terminal #1 on V4. Instead of 260V I'm seeing a fast oscillating voltage that my meter won't read on either DC or AC scale. I've double. triple checked, everything seems to be in all the right places. Anybody have an idea where this oscillation might be coming from? or what I need to do to track it down?