WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
Building, troubleshooting and testing of these amplifiers should only be
performed by someone who is thoroughly familiar with
the safety precautions around high voltages.
Resistors dissipate power
For R3 and R5 - 1W
For R4 - 1/2W
For R6 - 2W
Sometimes you can see it here and there.
"Вт" means "W"
(Russian schematic flavor)