MUSIC--300B Power Amplifier
In recent years, a few new and competitive domestic
manufacturers of power amplifiers have emerged. Zhejiang
Jiaxing Music Space Time Power Amplifier Manufacturing
Co., Ltd. is one of them. The company consists of a
group of professionals who love music and stereos and
are engaged in research, development, production as
well as sale of electronic tube advanced stereos. Music
Space Time is adopted as the company brand. Due to many
years¡¯ experience in audio business, it has access to
all kinds of domestic and foreign classic electronic
tube amplifiers and thus developed MUSIC Collection
Hi-Fi amplifiers after elaborate research and learning.
Most types are integrated power amplifiers and there
are also front-and-back split type of power amplifier
and earphone amplifier. Famous tubes such as EL-34,
KT88 and 300B have their own corresponding machines.
MUSIC-300B electronic tube amplifier is a new launch
of Music Space Time. Pentode 6J4P acts as the output
and voltage amplification of the first stage and can
provide sufficient excitation voltage for back stage
circuit. Triode 6N6 is in direct coupling with the first
stage. The output circuit of cathode works as the pushing
stage, which can achieve good impedance matching with
end stage, little non-linear distortion and sufficient
driving force. Here, common practice of parallel connection
is not applied to the two triodes, so the timbre and
analysis ability are in an ideal effect. Directly heated
power triode 300B-98 is adopted as the power output
of end stage and its dynamic will be not restricted
due to rated bias voltage. Filaments in the left and
right soundtracks are with independent direct current
supply so as to avoid inter-disturbance. In addition,
little large loop negative feedback is imposed on the
whole amplified circuit of MUSIC-300B in order to reduce
transient distortion as much as possible.
As to its appearance, MUSIC-300B has a smaller size
than other types in this audition. Normal layout is
applied in its whole structure. The bottom plate is
made of steel with silver grey baking painted surface.
The black aluminum alloy panel is treated with blast
surface with tiny and even grain, and matching dark
golden chrome-plating volume and input selection buttons,
which looks quite elegant.
Above the bottom plate, there are eight electronic
tubes arranged in order. The surface of three square
screen boxes is decorated with glistening ice baking
paint, in which the power transformer and output transformer
are installed. Low frequency chokes are installed in
one black round screen box. At the first use of the
machine, each electronic tube should be put into corresponding
seat in accordance with the number, but the seat numbers
are written with hand, which seems not to be formal.
On the back plate, MUSIC-300B provides three sets of
line signal input ends, which are enough for usage of
fans.
Inside the bottom plate, rather high level of producing
craft is shown. All the components are installed on
one large printing circuit plate and connection lines
between the circuit plate and transformer, volume potentiometer,
input buttons as well as wiring terminal are put in
order.
Components adopted in MUSIC-300B are of high grade,
such as imported metal-film resistance, German WIMAMKP
specialized audio capacitor, PHILTPS electrolytic capacitor,
as well as power switch and potentiometer from Japan.
Audio output transformer adopts imported Z10 specialized
audio steel sheet and the non-oxygen copper insulated
wire is reeled carefully by the technician. The frequency
response can reach 10HZ-100KHZ.
After audition, MUSIC-300B is characterized by thick,
warm, soft, saturated and natural sound, especially
when vocal discs are played. Mouth shape and location
of both male and female singers are quite accurate and
even reach a surprising level. Vocal sounds played in
MUSIC-300B seem to be pleasant, relaxed, smooth, fruity,
natural and with delicate and rich rhyme and residual
sound just like live singing. But if some other power
amplifiers are used to push, the sound will be tight,
stiff and without live sense. So it is no doubt that
MUSIC-300B is good at playing vocal sounds and that
is the most attracting feature of it. When large-scale
symphony disc is played, the sound seems to be especially
saturated and warm. If string music is played, you will
easily feel the powerful quality of music. The friction
sound of strings is true and detailed. It is interesting
that whatever for string, percussion or orchestral music,
MUSIC-300B can present a noble audio sense with reverberation
and ambience in the music hall.
As same as playing vocal sound, the location of each
section in the symphony is also quite accurate with
no obvious flattening tendency. As to the speed and
transparency, the performance of MUSIC-300B is mediocre
due to its back sound stage, dim timbre and ordinary
speed. Perhaps for its limited 9W+9W output power, you
will not hear strong and violent rhythm and striking
force in low frequency driving force, instead, you will
get thick low frequency energy, whose musical performance
is in harmony with high frequency. Obviously, people
will not use 300B on purpose to present dynamics and
force but pay more attention to its musical taste. If
a pair of excellent speaker boxes are matched with,
MUSIC-300B is worthy of recommendation indeed.
Basic Specifications
Output Power£º9W+9W
Frequency Response£º12HZ-38KHZ
Signal to Clutter Ratio£º78dB
Non-linear Distortion£º1%
Weight£º23Kg
Input Sensitivity£º350mV
Input Impedance£º100K¦¸
Size£ºW390mm/D340mm/H220mm
Price for Reference£ºRMB 5, 500
Extracted from¡¶Audio & Video Technology¡·¨C111 Analysis
of 8 domestic power amplifiers editing department of
Audio & Video Technology
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