TrendsAudio PA-10 Tube Headphone/Pre Amplifier User Manual
Page 5
Trends PA-10 User Guide
Section 7. Comparison / Section 8. Technical Notes
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If your machine is out of order, it may not be very serious. Before you call your local
distributor or us to repair, you are suggested to check the following:
Symptoms
Possible Reasons
Handling Methods
power cords not properly
connected
properly connect the power
cords
cannot power ON
indicator not bright
power switch is OFF
switch ON the power
the volume level is too low
turn volume level higher
the audio cable not properly
connected
properly connect the audio
cable
the audio source (e.g. CD
player) not started playing
start playing the audio source
wrong input is selected
check input selection
no sound at all
the speaker cables not
properly connected
properly connect the speaker
cables
hum
tube not fully pushed in
insert Tube securely
audio connector plug not fully
pushed in
insert plug securely
incorrect input switch position
check the corresponding input
switch
sound out(s) out
loose connection
check input and output
connections. When all has
been double-checked reduce
volume and switch unit back
on
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Tube x1
•
+24V power supply x1
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User Guide x1
•
Warranty Card x1
Trends PA-10 User Guide
Section 9. Troubleshooting / Section 10. Accessories
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Model
Trends PA-10
Trends PA-10 SE*
Trends PA-10 GE*
Tube
Chinese 6N11
Russian 6H23n
U.S.A GE 12AU7
Tube Types
6DJ8/6922 series
6DJ8/6922 series
12AU7 series
Audio output Capacitor
10uF cap(Black)
EVOX cap (White)
EVOX cap (White)
Sound Quality
Balance sound in full
range and good fidelity
Relative thicker &
heavier bass and
good
on orchestral
Relative warmer mid
range and excellent
female vocals
l
Trends PA-10 SE: Trends PA-10 Tube Headphone/Pre Amplifier -Special Edition
l
Trends PA-10 GE: Trends PA-10 Tube Headphone/Pre Amplifier - GE Edition with
12AU7 Tube series
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Trends Audio has already pre-set the jumpers and fine-tuned the DC bias voltage of
each PA-10 with the packaged vacuum tube before shipping. However, changing
different tubes to taste for different sound is the great fun for many audiophiles and
also a great feature of PA-10. There are some important notes should be aware before
changing tubes.
Trends PA-10 supports two major tube series: (1) 6DJ8, 6922, 6N11, 6H23n, ECC88,
E88CC, etc…, and (2) 12AU7, 5963, 5814, ECC82, etc… If you change the tube
within the same series, it needs to re-tune the DC bias voltages ONLY. If you change
the tube from another series, it needs both to re-tune the DC bias voltages and re-set
the jumpers. Otherwise, the tube may be burnt out.
10.1 Jumper Setting for Different Tube Series
You can simply configure the amplifier to support the two different tube series by
resetting the jumpers in J3, J4, J5 in the PCB as follows. (Remember to power OFF
the machine before setting)
6DJ8 series
12AU7 series
J3
O O O
O O O
O O O
O O O
J4
O O O
O O O
J5
O O O
O O O