Dusky D2O Podręcznik użytkownika - Strona 10

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It's safe to say that most of the lore around the proper way to turn a tube

amplifier on or off is apocrypha with little basis in practical application. Which

makes sense if you think about it. If tube amplifiers were really such fragile

objects that they require a special procedure to turn them on or off, careless

musicians would be damaging their gear all the time. In practice, musicians

regularly use vintage tube amplifiers that haven't seen any kind of service in

decades that continue to function reliably.

The universal absence of a standby feature on tube hifi gear should be another

clue that such a feature is not strictly necessary for preventing damage to the

amplifier.

Around here, we tend to leave the STDBY switch in the up position and only flip it

to the down position when the amp is already on and we want to temporarily

mute its output. This is, in fact, the intended function of the STDBY switch.

Can I change the power switch setting while the amp is on?

Yes. This feature is hot switchable. Y ou might hear a little bit of a pop. There is no

need to power off the amplifier or engage standby.

Can I unplug or plug in speakers while the amp is on?

When plugging in or unplugging speakers, the amp should be powered off or the

standby should be engaged.

Can I change the output impedance setting while the amp is on?

When adjusting the impedance selector switch, the amp should be powered off or

the standby should be engaged.

What if I plug a speaker cabinet into the AUX output with nothing

attached to MAIN?

The MAIN output uses a shorting jack that shorts the amplifier's output when no

speaker is connected in order to prevent damage to the amplifier in the event

that a user mistakenly powers the amplifier on without a speaker connected to

the output. Therefore, if you plug a single speaker cabinet into the AUX output

with no speaker attached at the MAIN output, the amplifier's output will remain

shorted and little or no signal will reach the connected speaker.

What if I run the amp with no speaker attached?

Generally speaking, it's not a good idea to run a tube amp without an attached

speaker load. This can cause damage to the power amplifier tubes or the output

transformer. T he output transformer is a fairly expensive part that you don't want