7
Front Panel
V O L U M E
I N P U T
S E L E C T O R
I M P E D A N C E
S E L E C T O R
M I N
M A X
P H O N E S A
P H O N E S B
P O W E R
O N
O F F
VA C U U M T U B E H E A D P H O N E A M P L I F I E R H A -
1
A M K
2
65
-
150
Ω
8
-
32
Ω
33
-
64
Ω
151
-
300
Ω
600
Ω
C D
A U X
DRAW
ONE
：
HA-1A MK2
Front Panel
1.Volume Control
Control the volume of the amplifier, turn clockwise to increase
volume, turn anti-clockwise to decrease volume.
2.Phone A
Designed to work with headphones terminated with standard
6.35mm stereo (TRS) connector. Can handle headphone
within the range of 8ohm to 600ohm, the actual impedance
value can be specified by selecting appropriate range from the
Impedance selector.
3.Source
The amplifier can connect with two sources (marked as CD
and AUX), you can select one source for playback.
4.POWER On/Off:
Turn on and off the amplifier. Be reminded to unplug the
power cable if the amplifier will not be used for a long time.
5.Status indicator
Indicate the working status of the amplifier, when the indicator
is always on, the amplifier is in regular operation
6.Impedance Selector
Select best matching impedance for your headphone. You
can select the best impedance range within 8ohm – 600ohm.
You can refer to the impedance value of your headphone and
select the nearest impedance range to match up with.
7.Phone B
Designed to work with headphones terminated with standard
6.35mm stereo (TRS) connector. Can handle headphone
within the range of 8ohm to 600ohm, the actual impedance
value can be specified by selecting appropriate range from the
Impedance selector.
2
4
7
3
1
6
Note: This amplifier is designed to output at fixed impedance, we do not recommend using
Phone A and Phone B concurrently because this might impose negative effect to audio
performance.
5
