Engl TUBE PREAMP 570, Руководство оператора

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silence, hello humming! In this case, the preamp will hum even without a guitar
connected.
-> Cords connected to the input, effect loops or to the power amp may not be
shielded properly. Replace them to check if this is indeed the case.
-> The preamp or speaker cords may be picking up interference from powerful
magnetic fields (for example, of nearby power transformers or electrical motors).
Reposition the preamp and connector cables.
-> The preamp or speaker cords may be picking up radio signals, for example,
from activated mobile telephones or powerful local transmitting stations nearby.
Switch off mobile phones while troubleshooting noise problems.
-> If you are feeding the signal to recording equipment or a mixing console via
the preamp's and the XLR Ground (46) button is set to Pin 1 to Ground,
the problem may be a ground loop that has been formed with the connected
device's ground. Set the button to Ground Lifted.
Line Out
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