What do I do with the standby switch?
If your amp is equipped with a STANDBY switch, there is only one correct way to use it. DON'T flick both the POWER and STANDBY switches on (or off) at the same time, or leave the STANDBY switch permanently in the "operate" position while using just the POWER switch. When you turn your amp's POWER switch on, make sure that the STANDBY switch is in the "standby" position. A STANDBY switch interrupts the high voltage supply to the tubes; when the amp is on "standby," only the tubes' filaments have voltage applied to them. When you turn the amp on, leave it on "standby" for at least five minutes...ten would be even better. This allows the tubes to warm up gradually; the tubes can take the high-voltage surge when the STANDBY switch is moved to the "operate" position much better when they are warmed up first. After the STANDBY switch is placed into the "operate" (or "playing") position, it will still take the power tubes several more minutes to reach full operating heat. It won't hurt anything to play the amp while the tubes are still not all the way hot, but the amp won't sound as good as it can until the tubes reach full operating temperature.
If you're playing a gig, DON'T PUT THE AMP ON STANDBY DURING THE BREAKS! Once it's hot, LEAVE it hot! Putting the amp on "standby" every time you leave the stand just thermally cycles the tubes (hot/warm/hot/warm etc.) all night long; this causes expansion and contraction of the internal parts, and this is one of the ways that tubes wear out. If you're worried about your guitar feeding back while you're on a break, just turn the guitar's volume control all the way down before you lean it against the amp or place it in its stand. When the gig is over, put the amp on "standby" and let it cool down for five or ten minutes before you turn it all the way off.
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