Owner`s manual

8
Ayon Audio – Hart 18 – 8101 Gratkorn – Austria – Phone: [phone]
www.ayonaudio.com
4. Turn OFF procedure
When powering down your system always turn the amplifier off first.
The unit can be turned off at any time (even while playing).
Important: If the Orion was turned OFF even for a short period of time, you should wait at least
2 minutes before turning it back ON. Do not turn it ON then OFF and then ON again in quick
succession. This precaution will minimize the stress (high voltages) on internal components.
Follow this procedure each time you turn your Orion OFF / ON.
5. Security caution in operation
A. Handle the Orion with respect, it is heavy.
B. Insert the vacuum tubes in accordance with the designated tube numbers into their relative
assigned sockets. Important: Pay close attention to the direction of socket pins NEVER FORCE A
VACUUM TUBE INTO PLACE. Tube should glide right in. If the direction is wrong and you force the
tube, damage to the socket pins will occur.
C. Turn volume control down to the minimum position.
Rotate input selector knob to the corresponding position for input device connected.
D. Check your speaker connections! DO NOT OPERATE AMPLIFIER WITHOUT INSURING THAT
SPEAKERS ARE CONNECTED TO THE AMPLIFIER. DAMAGE WILL OCCUR.
E. Do not switch from Pentode to Triode mode during operation of the amplifier. Turn amplifier
off and then perform the switch!
F. The Orion amplifier SHOULD NOT BE LEFT RUNNING WHEN NOT IN USE.
If you will not be listening to the amplifier for more than an hour, it is advised that the amplifier
be turned off. Unlike solid state amplifiers, tube amplifiers should be shut down when not being
used. This will greatly prolong tube life.
G. It is normal for vacuum tube equipment to runs very warm if used for prolonged periods.
H. Do not use a speaker with impedance lower than 2 ohms on either of the outputs.
Note: NEVER REMOVE THE BOTTOM PLATE OF THE ORION BEFORE UNPLUGGING THE UNIT FROM
THE WALL!
6. Bias adjustment – important!
The output power tubes need to be “biased” with a grid voltage that controls the flow of
electrical current through the tube. Tube biasing on the amplifier has been designed to be
both simple and effective. The bias is set individually for each tube so that the correct
operating point is assured. An added benefit to this approach is that, should a tube fail
prematurely, the single tube can be replaced without having to purchase a matched set.
Use the following procedure to set the tube bias:
Adjust the Bias via potentiometer: Bias1, Bias2, Bias3 and Bias4. Place the red terminal of the
digital multi-meter to the corresponding TP1, TP2, TP3 and TP4. Place the black terminal of the
digital multi-meter to the Common (negative) terminal - ohm speaker-out of the amplifier. The
current value will be displayed of the electrical current running through the KT88 tube. The
correct value should be approximately (DC) 450mV.
Important: Please check the bias voltage several times during the first 20 minutes of warm up
and adjust if necessary to the recommended value.