Raysonic SP-120MKII User manual

Model: SP-120MKII
KT88 Ultra-linear
Integrated Stereo Tube Amplifier
Owner ’s Manual
P.O.BOX 46565, Toronto,
Ontario M1T 3V8 Canada
sales@r aysonicaudio. com
ww w. r ay son ic a ud i o. c om
Raysonic Inc.
www.rayso nicaudio .com
P.O.BOX 46565, Toronto,
Ontario M1T 3V8 Canada
sales@ray s o nicaudio.com
ww w. ra y so nic au d io .c o m
Raysonic Inc.

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Class AB, ultra-linear design.
Two pairs of KT88 output tubes operate in
ultra-linear 50 watts x 2 channels.
Minimal negative feedback with precision
RC circuitry for more linear performance.
Extended frequency range output transformers.
4 power tubes are individually biased.
Remote volume control.
All-aluminum chassis.
Chassis finish: black or silver.
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Thank You
We would like to express our gratitude for choosing Raysonic Inc.’s
SP-120MKII as part of your core component of your audio system. The
Model SP-120MKII is considered as a one-of -kind integrated tube
amplifier in the high-end audio market. It features all the popular line
signal inputs found in most integrated amplifier. We understand digital
audio source is pretty popular in these days and more importantly we
acknowledge that record vinyl has made a strong comeback as well.
Raysonic was incorporated in 2000 and is currently based in Toronto,
Canada. We are a high-end audio equipment manufacturer constantly
striving for craftsmanship excellence and audio quality. We truly believe
that the SP-120MKII is a unique integrated amplifier by its own. We hope
you can both enjoy the visual appeal and the sound quality of this product.
Should you have any questions and comments please do not hesitate to
contact us by any means.
Thanks very much for your support
Steven Leung
CEO Raysonic Inc.
The integrated amplifier has the following features:Raysonic SP-120MKII

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2
2. Remote control sensor.
3.
4. Power switch.
1 Volume control knob..
Input selector knob.
Front Panel
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OFF
POWER
ON
4
VOLUME SELE CTOR SP-120MK
AUX
TUNER
CD
MIN MAX
MUTE
LINE
3
2
1
Warranty Information
One-year limited warranty
90 Days warranty on stock vacuum tubes
Limited to original purchaser. This warranty is for the sole benefit of
the original purchaser of the covered product, and may not be
transferred to a subsequent owner.
Conditions & Limitations. This warranty is subject to conditions and
limitations, as follows. This warranty is void and inapplicable if the
product has not been used in accordance with the instructions found
elsewhere in this manual, or if it has been misused, abused, damaged
by accident or neglect, or in transport once in possession of purchaser.
The warranty is also void if the product has been tampered with or has
been repaired or modified by anyone other than Raysonic Inc. or its
specifically authorized representatives.
Remedy. lf this product contains material, manufacturing, or
workmanship defects, it must be packed in original packaging and
returned to Raysonic Inc. or its authorized representative via insured
freight, at the owner’s expense. Returned products must be
accompanied by written description of the defect, and a return
authorization number(available from Raysonic Inc. or the authorized
representative via e-mail). Upon receipt of the defective product,
Raysonic Inc. or the authorized representative agrees to repair the
product without charge for parts (except vacuum tubes if the unit is
more than 6 months old) , or labor. The product will then returned via
prepaid, insured freight, with carrier at the sole determination of
Raysonic Inc. or the authorized representative. This constitutes the
purchaser’s sole remedy.
Design change. Raysonic Inc. and its partners reserve the right to
modify their products or change specifications at any time without
obligation or liability to previous purchasers.
Miscellaneous. Any implied warranties relating to the above product
shall be limited to duration of this warranty. This warranty does not
extend to any identical or consequential costs or damages to purchaser
or third parties. Our liability will be no more than the amount you paid
for the product that is the subject of a claim. This is the maximum
amount for which we are responsible. This warranty gives you specific
legal rights. You may also have other rights that may vary from country
to country and state to state.

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Remote Volume Control
3
Rear Panel
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1.
2. Speaker Binding Posts.
3.
AC Power Socket.
RCA Audio Input.
CD
VO L-
MU TE
VO L+
SP SERIES
TU NER
AU X
LI NE
1 2 3
100V 50/60Hz
120V 60Hz
AC IN
FUSE/8A
R
L
AUX
AUDIO INPUT
TUNE R
LINE
CD
0
SPEAKER OUTPUT
0
SPEAKER OUTPUT
4
8
48
RAYSONIC INC.
TORONTO.ON.CANADA
WWW.RAYSONICAUDIO.COM
SER.NO.:
INT EGRATED S TEREO AM PLIFI ER
MODEL:SP-120MK
R L
CAUTIO N
RISK OF ELECTR IC SHO CK
DO NOT OPEN
Remote control layout
Power tube bias information
+-
0.45V
+-
0.45V
+-
0.45V
+-
0.45V
V1
KT88
V2
KT88
V3
KT88
V4
KT88
12AU7 12AU7
6922
Tp1
Tp2
Tp3
Tp4
Bias1
Bias2
Bias3
Bias4

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4
Specification
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Package Contents
Raysonic SP-120MKII Integrated Amplifier 1
Power Cord 1
This Owner’s Manual 1
White Gloves 1 pair
Tube Complement 4x KT88
2x 12AU7
1x 6922EH
Main Slow Blow Fuse 100V-120V 50Hz/60Hz 1x8 amp fuse
220V-240V 50Hz/60Hz 1x6 amp fuse
Remote Control 1
Vacuum tubes: KT88 x 4,12AU7 x 2, 6922EH x 1.
Output power: 50w x 2 channels.
Input sensitivity: 970mv.
Input impedance: 100k .
Harmonic distortion: <1%.
Frequency response: 5Hz - 78kHz ±1dB.
S/N ratio: 96dB.
Input: 4 sets.
Speaker output impedance: 4 or 8 ohms.
Power consumption: 275 watts.
Dimensions: 43L x 30W x 20.5H (cm).
Operating Voltage: 100-120VAC. 50Hz/60Hz (220-240VAC 50Hz/60Hz).
Weight: 25kg.
Ω
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Carefully remove the SP-120MKII from it’s packaging. Use the white gloves
to prevent fingerprint smudges.
Remove the amplifier carefully from the package box.
Remove the protective foam or packaging materials surrounding the tubes.
Once the tubes are installed, make sure that each tube is firmly in placed in its
socket.
Make sure the power switch is at the Off(0) position.
Connect individual audio source to the corresponding plugs.
Connect your speakers with your speaker wires from positive to positive and
negative to negative.
Plug the power cord into the amplifier, then into the wall socket.
Turn on the SP-120MKII amplifier.
The tubes will be warmed up and ready to use in about 120 seconds.
SP-120MKII is an integrated stereo amplifier built on a single aluminum
chassis.
There are totally heptad vacuum tubes being utilized in the whole amplifier.
Among the tubes are one single 6922EH used for voltage gain and two 12AU7
used as drivers, four KT88 as power output tubes.
The KT88 output tubes can be individually biased for better tube matching.
Please consult the biasing section for further detail.
Daily operation of the SP-120MKII is easy. The amplifier has two sets of line
input and one pair of speaker terminals at the back of the panel. On the front
the user can easily locate the Volume and the Selector control. The power
switch is located on the right hand side of the chassis.
Setup
Operation
Power Tube KT88 Bias
Warning
Only a qualified electronic technician can perform the tube bias adjustment.
We recommend the bias voltage for KT88 is set to 0.45V ±2%.
It is recommended that once the biased voltage has settled the power tubes
should be settled in its assigned tube socket and should not be changed again.
Power tubes should be adjusted every 12 months if necessary.