Music Space Time Music-88MK
Amplifier
Music Space Time Power Amplifier Manufacturing Co.,
Ltd. has not been established for long. It is located
at Zhejiang Jiaxing, a city with developed economy and
deep cultural foundation. Mr. Li, the proprietor of
the company, has been engaged in the audio business
for many years and goes in for electronic tubes. In
the past ten years, he has collected about ten thousand
domestic and foreign famous electronic tubes. Now, Music
Space Time consists of a group of professionals, who
love stereos and focus on the development of electronic
tubes. Music Space Time has become a new amplifier brand
in China.
Based on rich experience in stereo business, Music
Space Time learns from classic circuits of overseas
well-known electronic tube machines and has developed
Music Collection electronic tube amplifiers. The company
is in small scale at present but their products are
excellent. Each type of machine goes through elaborate
design and adjustment, so it is suitable to the taste
of fans. The company also has exquisite craft. It is
not difficult to manufacture products with fine appearance
due to high level of processing in China. |
Many imported components are applied in Music Collection
electronic tube amplifiers, including imported metal-film
resistance, MKP audio specialized capacitor, specialized
electrolytic capacitor for high-speed audio and potentiometer
and power switch from Japan, such as advanced capacitors
of Black Metal, Phillips, Elna, Kimber, M-Cap and Rifa,
RS power switch from U.K, Alps potentiometer and wave-band
switch from Japan. The output transformer adopts imported
Z10 annealing high-silicon-oriented flake and non-oxygen
copper insulated wires. Special reeling method is applied
to output transformer so that the frequency response
reaches 13HZ¡ª100KHz(£1db). Music amplifiers have special
sound performance due to repeated optimization of circuits
and elaborate adjustment.
There are several types of Music Collection amplifiers
and EL34, 300B and KT88 amplifier tubes are adopted.
Music-88MK is improved on the basis of 88i and 88WE
and is an integrated amplifier adopting KT88 amplifier
tube. The shell is quite firm and without any deformation
after movement since it is made of super thick aluminum-magnesium
alloy plate. The panel is made of 10mm aluminum-magnesium
alloy plate and oxidized black silk. Complete blackness
of the machines seems to be heavy and grave. There is
a round power supply indicator in the middle of panel.
Blue-and-purple light and characters of ¡°Music¡± will
come up when the machine is power-on. Metal buttons
on both sides are plated with titanium. |
The front stage of Music-88MK adopts 12AT7 as voltage
amplification and medium amplification coefficient double
triodes12AU7 as phase reversal. Transformed long-tail
phase reversal circuit is in direct coupling with the
front stage in order to improve transient response.
The design of high plate voltage and plate current is
applied to front stage amplification and push circuit
so as to provide sufficient push voltage for power amplifier
stage. Front stage push 12AT7 and 12AU7 both adopt American
GE products, which are the collections of Mr. Li. The
application of these tubes will further improve the
timbre of the machine.
Power amplification stage adopts exported type of KT88
power tube produced by Shuguang, which can bear 900V
high plate voltage. In the past, most domestic KT88
tubes were regarded as ¡°Amplifier Killer¡± since they
would burn the plate and even spoil the machine in case
of higher plate voltage. So it has been seldom adopted.
But the exported type of KT88 produced by Shuguang can
reach 900V of plate voltage and keep stability. The
plate voltage of Music-88MK is set to be 600V, so high-quality
KT88 tube should be applied to such a circuit with high
plate voltage in order to ensure the stability of operation.
The output stage adopts rated grid bias voltage and
standard push-pull so as to get sufficient push ability
and dynamic response. The grid circuit parameter is
also optimized accordingly so that the working status
is stable. Large loop negative feedback is imposed so
the frequency and damping capabilities are excellent. |
Specially designed output transformer of Music-88MK
adopts high-quality materials, which can ensure wide
frequency response and low phase distortion. Excellent
power circuit also provides sufficient power supply
and swift supply response for the machine. As what is
mentioned above, components of the machine are all high-quality
products. Wiring ends at the back of shell are also
advanced CMC products. Thus the machine is characterized
by good assembly craft, high completion, satisfactory
sound quality and stable working of circuits.
Music-88MK has sufficient push and each track has 70W
output power. When it pushes two medium floor-standing
speakers, Dynaudio C2 and Mordaunt Short Performance
6, Music-88MK performs well and naturally. The sound
stage, dynamics and strength as well as elasticity of
bass seem to be pushed by large power amplifier. The
sound is concise, direct and with good analytic ability
and quick transience. Your will not hear obscure and
dim but vivid and vibrant music. |
To sum up, Music-88MK of Music Space Time is a successful
design of electronic tube amplifier. Its strong dynamics
and vibrant sound orientation enable us to enjoy more
music denotation and its powerful driving force offers
us wider choices of speaker matching. On the other hand,
due to its smooth and pliable timbre, sense of beauty
is embodied in music. So Music-88MK can present both
powerfulness and softness and is really super value
among same products around RMB5, 000. If there is any
further improvement, we can adopt Russian EH electronic
tube and the sound will be fruitier. But that depends
on personal taste and system matching.
Relevant Technology Parameters£º
Output Power£º70W ¡Á 2
Frequency Response£º13Hz¡ª100KHz(¡À 1dB)
THD£º<1£¥
Output Impedance£º4¦¸¡¢8¦¸
Extracted from¡¶Hi-Fi Stereo¡·2005-3 Author£ºMa Longhui |