yes. in future i can upgrades many components.
ask: in a manual say (setup bias):
After about 20 seconds or so of the tubes
being lit up you should begin to get a reading on your meter. We want to set the bias of each side to 1VDC on the meter, turning the bias potentiometers clockwise will cause the voltage reading to go up and
counterclockwise will cause it to decrease.
i need setup with amp after about 20 seconds or 5` - 10`minutes?
i see 20 sec 0.7V
and then 10` min 0,9V.
how long I have to wait to start the configuration ?