OK, if you’re a guitar player and don’t know these basics, then you deserve Amp Farm™. This is the foundation on how to get and develop your tone.
First, always turn on the power switch and wait for about a minute before switching the standby on. This allows the tubes to heat up a little which will extend their life. Reverse the process to shut down. Never turn an amp on without a load (speakers) or you may damage the output transformer and power tubes. Always match the impedance of the amp with the speaker cabinet.