One goes like this: Tubes operate on two different types of electrical current, a low-voltage AC current that heats up their filaments, and high-voltage DC current that drives the amplification. If the high-voltages DC hits them before the low-voltage AC has warmed them up it can do gradual harm to the components within the tube, and ultimately shorten their life. When you power up an amp with standby engaged, you’re guaranteed that the tubes are warmed up with low-voltage AC current first.

Others point to tube amps that have no standby switch at all, yet function perfectly well.

Here’s our take on it: If you amp has a standby switch, power the amp up with the standby on. Then, after the amp has warmed up briefly, turn on the standby and get to playing! Use the standby to “mute” the amp when you take a break.

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When I Turn On My Tube Amp, Does It Need to be in Standby?

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