Owner`s manual

9
Ayon Audio – Hart 18 – 8101 Gratkorn – Austria – Phone: [phone]
www.ayonaudio.com
Important notice for new tubes or new amplifier: When using the amplifier for the first time or
after any exchange of the KT88 tubes, the bias voltage for the KT88 tubes should be set to
around 250mV and the amplifier should be run with this value for some hours to allow for a
smooth initial run-in of the tubes. After completion of this "warm up" phase, the bias should be
slowly increased towards the optimal value of 450mV. A new KT88 tube is known for its
tendency to let the bias rise slowly but continuously.
KT88
KT88
KT88
KT88
12AU7
12AU7
200K
2 0
K
2 0 0 M
2 0 M
2 M
2
0 0 m
2
2 0
2 0 0
1
0 0 0
7 5
0
2 0 0
2 0
2
2 0 0 m
h F E
2 n
2 0 n
2 0 0
n
2 ¦ ?
2 0 ¦ ?
2 m
2 0
m
2 0 0 m
2 0
2 0
2 0 0 m
2 0
m
2 m
D
C
A
2
0 0
2 K
D C V
A C
A
A C
V
C X
P
N P
N P N
E
F
B C E E B C E
U N F U
S E D F
U S E D
2 0 A A C O M V ¦ ?
¦ ?
!
D C 1 0 0 0 V
A C 7 5 0 V
M A X
0 . 2 A
M A X
M A X
5 0 0 V
M A X
O F F
O N
12AU7
Common4 Ohm TP 4
Bias 4
Source
Right
Left
USB 8 Ohm TP 3
Bias 3
TP2
Bias2
TP 1
Bias 1
Line 3Line2Line 1
Serial No. 0Ayon - Austria ayonaudio.com
Phase
~AC In
PreOut
Power
bias adjustment
7. Triode / Pentode switch (T/P)
The output transformer of a tube amplifier acts as the electrical interface between the very
different impedances of the loudspeaker and the tube circuitry. There are two fundamental
ways that the output transformer can be connected to the tube circuit.
1) Triode operation: The lowest and most advanced level of distortion is achieved but at
the expense of output power. In the case of the Orion, its power level in triode is high enough
that it will likely provide plenty of power for almost any speaker load.
2) Pentode operation: For loudspeakers that demand very high levels of power,
Pentode-ultralinear should provide excellent sound and plenty of power.
The triode/pentode switch allows the user to operate Orion in either of the two modes.
In general, the sonic differences are subtle but for a given loudspeaker one mode is likely to
sound better than the other. There is a complex relationship between the output transformer
and the crossover network so try both and see which one works best in your system.