I am building a JTM45 from a Mojotone Kit. I’m using everything from Mojo except the OT which I have sourced from Merren Audio. I am beginning to power everything up and checking voltages. I have installed the GZ34 (no other tubes) and turned the power switch on. Things look OK except for the fact that I’m showing 512Vdc at the standby switch. Shouldn’t it be more like 340-350? I have yet to turn the standby switch on.