HALF AUTOMATIC BIAS CONTROL FUNCTION
Each power tube is controlled by plate current.
The correct function of the power tubes is shown by 1 LEDs,
next to each power tube.
When the amplifier is operating, no LED is shinning.
In case that any of the power tubes is faulty the LED,
which are together at the side of the power tubes ,
immidiatly indicated.
If this happens, you have to change the power tube of this place.
After changing the power tube, the LED must be off again.
Please notice:
All handling at the open amplifier has to be done
when the main power plug is disconnected .
When the amplifier is driven in a very high level output,
there is a slighty shinning of the LEDs.
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