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Thank you very much for using AUDIO SPACE REFERENCE-ONE vacuum tube
mono block power amplifier. Please read this instruction manual carefully before
using your amplifier.
MODEL: REFERENCE-ONE (VACUUM TUBE MONO BLOCK POWER AMPLIFIER)
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SPECIFICATIONS
OUTPUT POWER: 50W (TRIODE)/P-P CLASS A
OUTPUT IMPEDANCE: 4ohm, 8ohm,16ohm
FREQUENCY RESPONSE: 20Hz-20kHz 0.5dB
T.H.D.: <1% 20Hz-20kHz (REF. OUTPUT)
INPUT SENSITIVITY: 700mV
INPUT IMPEDANCE: 68Kohm (RCA)
S/N: >89dB (HUM NOISE<1mV)
TUBES: (300B×2,845×2,6N8P×1,6N9P×1)/CHANNEL
POWER REQUIREMENT: AC 220V/110V±5% 50/60Hz
DIMENSION: mm×mm×mm (D×W×H)
WEIGHT: N.W.: kg×2 G.W.: kg
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IMPORTANT SAFETY INFORMATION
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WARNING
* To reduce the risk of electric shock, don’t remove the cover.
* Don’t attempt to repair the product by yourself.
* No user serviceable parts inside. Refer servicing to qualified service personnel.
* Keep liquids away from the amplifier. If you spill liquid into the unit, pull out the
power plug at once and consult your dealer.
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CAUTION: BEFORE OPERATING THIS NEW PRODUCT, PLEASE CAREFULLY
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READ THIS OPERATION MANUAL AND THEN SAVE IT FOR FUTURE
REFERENCE. IT WILL BE USEFUL IF YOU HAVE ANY DIFFICULTIES IN
OPERATING THIS NEW PRODUCT IN THE FUTURE.
1. It is dangerous to use this new product if
This product begins to smoke, smell, or make strange sounds. If this happens, immediately
switch off the power, unplug the power cord and contact the nearest authorized service
center.
2. Never remove the bottom cover
Do not remove the bottom cover of this product. Touching high voltage parts inside the
cabinet can result in electric shock and/or damage to the unit. This product contains
sufficient levels of voltage and current to be “lethal”. Do not tamper with a component or
part inside the unit. Even with the power turned off, a charge remains in the energy storage
capacitors for some time. Refer adjustment inside the cabinet and any needed service to
your authorized Houston dealer or other qualified technician.
3. Avoid exposing this product to direct sunlight, dust, heat sources or moisture
Do not place this product in a location where it is exposed to direct sunlight, dust, heat
sources, high humidity, kitchen smoke, etc., as these may cause malfunctions.
4.
Select a safe and well-ventilated location
Select a safe location from children, dog and cat to keep they or it cannot be easy to touch
the vacuum tubes and the product.
Don’t operating over 6 hours and the cabinet has air vents to allow heat to escape.
Obstructing these air vents may result in malfunction or, in some cases, fire. Always
observe the following guidelines:
Keep this product 10cm or more away from walls.
Do not place this product in a confined spaces with poor ventilation.
5. Handling the power Cord
Using a damaged power cord, or one with the bare wires exposed, could cause fire or result
in electric shock. Always observe the following guidelines:
When unplugging from the AC mains, never pull the cord. Always grip the plug when
unplugging the power cord.
Never place this product itself, furniture, rugs or other heavy objects on the power
cord.
If the power cord must pass near a heater, make sure the cord is far enough from the
heater, that the cord under no circumstances will melt or come in contact with the
heater.
If the power cord is damaged, immediately purchase a new one from the nearest
service center approved by Houston.
6. When the product will not be used for an extended period of time
If you go away on holiday or otherwise will be absent for a long time, as a safety
precaution, unplug the power cord from the AC mains or press the mains power switch (OI)
to move it from ON to OFF.
7. Do not place objects containing liquids on top of this product
Do not place any objects containing water or other liquids on this product.
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If liquids enters this product, it can cause malfunction, electrical shock or fire. If
liquid should enter the cabinet, unplug the power cord from the AC mains and contact
the nearest service center approved by Houston.
8. Never insert objects into this product
Do not insert or drop metallic or inflammable objects into this product through the air vents,
as this can cause serious damage, electrical shock, or possibly fire.
9. Keep the product away from strongly magnetic objects.
WARNING: THIS APPARATUS MUST BE EARTHED
IMPORTANT: THE WIRES IN THIS MAINS LEAD ARE COLOURED
IN ACCORDANCE WITH THE FOLLOWING CODE. GREEN-AND YELLOW: EARTH,
BLUE: NEUTRAL, BROWN: LIVE
As the colours of the wires in the mains lead of this apparatus may not correspond with the
coloured markings identifying the terminals in your plug proceed as follows:
The wire which is coloured GREEN-AND-YELLOW must be connected to the terminal in the plug
which is marked by the letter E or by the safety earth symbol “GND.” or coloured GREEN
or GREEN-AND-YELLOW.
The wire which is coloured BLUE must be connected to the terminal which is marked with the letter
N or coloured BLACK.
The wire which is coloured BROWN must be connected to the terminal which is marked with the
Letter L or coloured RED.
For the U.K.
*The product which is equipped with a THREE WIRE GROUNGING TYPE AC PLUG must
be grounded.
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WARRANTY SERVICE
1. This product(s) is (are) warranted for a period of twenty-four months beginning
from the date of purchase.
2. To obtain warranty service, the warranty card bearing your dealer’s company chop
or signature must be returned to your dealer or our company within ten days from
the date of purchase.
3. The defective product must be returned to your dealer or our company for repair
when your requirement is accepted by your dealer or our company.
4. The warranty doesn’t extend to any product that has been opened by yourself
without the permission of our company.
NOTICE:
* The information and circuit diagram in this instruction is subject to change without
notice.
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OPERATING INSTRUCTIONS
(I) UNPACKING
Please check carefully whether or not there is any damage with the carton before
unpacking. Put it on a flat surface with the arrow upward, then unpack the carton and
you will find: (1) one pair amplifier of AUDIO SPACE REFERENCE-ONE (2) two
power suppy cords (3) an instruction manual (4) a warranty card (5) four pieces of
fuse.
PROPOSITION: Please save the carton and the packing material, they will be helpful
if you need to move your unit.
NOTE: * Please check whether your line voltage is the same as that marked on this
unit. If not, please contact your dealer or our company.
(II) CONNECTING
Connect the amplifier input to the sound source (pre-amplifier) with the signal wire
on the rear panel. Set the “Negative feedback” selector to the correct position, then
connect the pre-amplifier to the sound source with the signal wire. Don’t confuse L
with R.
Select the suitable output impedance terminals on the rear panel for your speaker,
connect the amplifier to the speaker with specialized audio cable. Be sure to connect
only Positive (+) cords to Positive (+) terminals, and Negative (-) cords to Negative (-)
terminals.
Then connect the power cord. At first plug the power cord into the power socket on
the rear panel , and come next plug the other end of power cord into a power outlet.
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NOTE: * Red is Positive (+), Black is Negative (-).
(III) TURNING ON
When you are sure the connections are correct, adjust the “VOLUME” of
pre-amplifier to the lowest position and turn on the amplifier and pre-amplifier by
turning the “POWER” button then the “LED Indicator” will light up, indicating the
amplifier is normal . Then you will enjoy the music by adjusting the “VOLUME” of
pre-amplifier while your sound source is working.
NOTE: * To prevent damage to circuit, never short-circuit Positive (+) and Negative
(-) speaker terminals, and never cut off the speaker cable while the unit is on.
* Be sure to set the “VOLUME” of pre-amplifier control to the lowest
position amplifier before turning on or disconnecting the speakers while the unit is on.
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DIAGRAM
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Diagram 1. REFERENCE-ONE FRONT PANEL
① POWER SWITCH ② INDICATOR OPERATE
③ INPUT BAL ④ METER
⑤ METER SELECTOR ⑥ BIAS RANGE
⑦ BIAS SELECTOR
Diagram 2. REFERENCE-ONE REAR PANEL
① BAL INPUT ② BAL/RCA SELECTOR
③ RCA INPUT ④ SPEAKER OUTPUT
⑤ POWER SOCKET
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Diagram 3. VACUUM TUBE INSTALLING
① POWER TRANSFORMER ② CHOKE COIL
③ AUDIO TRANSFORMER ④&⑤ HUM BALANCER(845)
⑥&⑦ HUM BALANCER(300B) ⑧BIAS TEST TERMINALS
*REMARK: V1:6N8P
V2:6N9P
V3,V4:300B
V5,V6:845
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