a15mk2 no sound

hi all. I assembled the kit a15mk2 and when I tested it sounds very very low, I would say barely half 1 watt. when measuring voltages, had 6.7 volts AC on the heaters. 33 mv in the resistance of v5 and 34 mv in the resistance of v6. One thing that catches my attention. when I turn on the amplifier. v4 tube gives a strong light for a moment, at the same time turning it on, and the tube v1 takes 2 or 3 seconds to start warming up, do not know if this is normal. appreciate any help in trying to find the fault. regards