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3. GETTING STARTED
3.5. Checking the power tubes – setting the BIAS
For the first function check you don’t have to connect the loudspeakers or the preamp.
The trim pots are located next to their respective tubes. Next to each trim pot you will see a pilot
lamp, which shows which tubes have been selected with the bias selector switch. A row of LEDs in
front of the transformer cover assists you in setting the bias correctly. It shows three conditions:
bias too low, correct, and too high.
Before checking the BIAS please wait five to ten minutes.
Because the tubes are still cold you
would adjust the wrong BIAS
Turn the BIAS-selector switch clockwise to position V1 = BIAS setting for the tube V1. The LED
next to the tube will illuminate, and one of the three BIAS LEDs will illuminate, normally first the
Minus LED, than the OK-LED.
The LED display:
Ecomode LED
Indicating the status of the Ecomode (see chapter 6.4)
Yellow "-" LED
BIAS setting of the selected output tube is too low
Green “OK” LED
BIAS setting of the selected output tube is correct
Yellow "+" LED
BIAS setting of the selected output tube is too high
Red "off" LED
Indicates that the electronic protection has switched off the
amplifier (see chapter 6.2)
After an additional 5 to 10 minutes, the BIAS control LEDs will change from yellow to green in case
the BIAS Measurement Electronic is switched to tube 1 for example. This indicates the correct
BIAS. Check all four tubes and switch OFF the BIAS electronic during listening.
If you notice any irregularity (“+” = High BIAS ) in the display please refer to chapter 7.3.
3.6. Connecting other components to the RE 290
1)
Make sure that the RE 290 is switched off !
2) Connect the other components in your system to the appropriate sockets on the rear of the
RE290. (See chapter 5 "Rear panel connections".
3)
Check that the switch positions on the front and rear of the amplifier are in their recommended
settings.
4)
Switch on the RE 290 using the on/off switch and wait a few minutes until the unit is powered.
Now you can listen to music.
