|Overall Improvement on Power Amplifier
of Music Space Time [Tang Daoji]
Province Jiaxing City is a place with outstanding people,
abundant resource and deep cultural foundation. There
are a number of music and audio fans there. Music Space
Time Power Amplifier Manufacturing Co., Ltd. is thus
established and grows under such circumstances.
Recently I had a chance to visit Music Space Time and
found further improvements on their popular products
with higher fulfillment and better sound, which is worthy
of recommendation in such a depressing market. There
are few people who really know audio technology and
love it deeply in the audio industry. Mr Li from Music
Space Time is a serious and persistent specialist with
professional technique and deep love for the products.
He selects components carefully, forms circuit scientifically
and constantly explore and improve to manufacture machines,
which may be the biggest secret of its being recognized
by the market soon.
Integrated amplifiers of Music Space Time are classified
by the type of power output electronic tubes. MK and
WE are two newly launched types. MK is the version of
ordinary improvement while WE is the advanced version.
WE advanced not only uses imported electronic tube and
aluminum-magnesium alloy case but also applies components
with higher capability in its key part, such as M-CAP
advanced coupling capacitor from German, RS power switch
from U.K, high-end ALPS volume potentiometer. According
to the audition of two versions, we find WE advanced
is much better than MK in sound performance.
Music Space Time has archives for each complete machine
out of the company, including machine code, record of
key components and record of technical parameters before
and after aging. Such records are important to users
since the company can provide new component of same
capability in accordance with the archive, especially
the power electronic tube in case of any damaged component.
That in some extent prolongs the time of users to enjoy
good capability and is also a guarantee measure for
In respect of appearance, craft and capability, we
are impressed by Music Space Time and its reliable quality.
According to the inspection of circuit formation and
production process of each type of machine for batch
production, improvements on complete machines in the
technical aspect are analyzed as follows:
The first improvement is time-delay supply of high-pressure
power. The cathode of electronic tube is not heated
completely since high-pressure power will cause damage
to the cathode of electronic tube and reduce its life,
especially for the power amplifier. So high-pressure
power rectified by semi-conductor diode and time repeater
are applied with an aim to delay power supply of high
pressure and prolong the life of electronic tube. All
newly launched power amplifiers of Music Space Time
adopt 30-second repeater to delay the time of high-pressure
The second improvement is optimized power amplifier.
Multi-electrode power amplifier has higher internal
resistance. If there is no negative feedback, the damping
parameter is only between 0.11 and 0.17. If there is
20dB loop negative feedback, the damping parameter of
the whole machine is still low even though the internal
resistance can be reduced greatly. Control over low
frequency relay of loudspeakers is not agreeable and
that is common weakness of general electronic tube power
amplifier. Since more loop negative feedback will cause
transient response, reduction of anode resistance can
only be realized in way of multiple negative feedback
of power output stage. Music Space Time has optimized
the negative feedback of output stage in its power amplifiers
launched at the end of March so that the damping parameter
is increased, sound of low frequency is much clearer
and the timbre is greatly improved.
The third improvement is further optimization of power.
Power is the basis of amplifier and its capability plays
an important role in sound performance. Optimized power
can not only further improve the signal to clutter ratio
of the machine, but also present a more peaceful background
and more pure and delicate high frequency. Music Space
Time has made much efforts on the improvement of sound
Why every type of amplifier manufactured by Music Space
Time has sound performance? That is absolutely not accidental
in my opinion after inspection. For example, the output
transformer applies imported Z10 iron core and non-oxygen
copper insulated wire and it is manufactured with special
craft. Its wide range of frequency response between
20Hz and100KHz¡ª1dB is true after my trial and is really
difficult to reach. Secondly, the components are selected
among many brands so as to apply those with highest
C/P. Thirdly, the craft is excellent. Measures are taken
to fix large components so as to be prevented from movement.
Circuit connection lines outside the printing plate
are through metal foot¡ Finally, only after continuous
24-hour aging, the product can go into the market. All
these are the quality guarantee of Music Space Time.
As far as Mr. Li disclosed, they are planning to launch
front-stage amplifier with high C/P and single-ended
output integrated amplifier suitable for salary-earning
families. So we are looking forward to that.
Extracted from¡¶New Audiophile¡·- 53 Author£ºTang Daoji