Marshall JVM410H HEAD Bedienungsanleitung Seite 13

Only when the amplifier is in 'standby'
(STANDBY switch OFF) can the amplifier
be used without a speaker load. Always
ensure a speaker load is connected when
leaving SILENT RECORDING: i.e. when
switching the STANDBY switch ON to
engage the amplifier.
12. POWER
Mains power on/off switch.
ENGLISH