Brand-new Power Amplifier Worthy
of Try
Comment on MUSIC--34I of Music Space Time
Many audio and music fans are fond of the speciality
of electronic tube amplifier. Lots of brands in the
market, whose output power is between 30 to 40WR, are
relatively high for fans although they have excellent
quality and timbre. So I have been looking for one type
of machine with both good quality and acceptable price
and I do find one accidentally.
That is MUSIC-34I integrated amplifier produced by Jiaxing
City Music Space Time Power Amplifier Manufacturing
Co., Ltd. with 40Wrms*2 of output power, 16-80000Hz1dB
of frequency response, above 85dB of signal to clutter
ratio is, 4 or 8 output resistance and application of
electronic tubes 6N1*4 and EL34B*4.
MUSIC-34I electronic tube integrated amplifier has
a typical circuit structure. The first stage applies
anode coupling SRPP circuit consisting of dual triodes
6N1 as its front stage amplification. Its high gain
and negative feedback of current result in the expansion
of frequency response. The second stage applies long-tail
phase reversal circuit consisting of dual triodes 6N1.
This stage is provided with certain voltage gain. Anode
resistance of upper tube is less than that of lower
tube so as to reach optimal balanced output. And direct
coupling without coupling capacitor is applied to the
second stage and front stage, resulting in reduction
of phase shift and extension of low frequency response.
The end stage adopts standard push-pull of pentode EL34.
In order to reach maximum power output, rated bias voltage
is applied. Bias voltage value of each tube is adjustable,
so it is easy to achieve balance. Negative feedback
of loop circuit from the secondary output transformer
to the cathode of first stage, including the output
transformer, can reduce distortion caused by the transformer
and further improve the capability of machine. The output
transformer of special design can ensure the capability
of such machine.
This machine adopts simple shape, substantial materials
and exquisite craft. It has balanced full frequency
and the sound is sweet, smooth and saturate. Its sufficient
output can push most speakers. So it is suitable for
playing all kinds of music and can get good timbre.
All the electronic tubes of the machine are domestic.
If the tubes are replaced by EL34 power output electronic
tube, the timbre will be fully improved, which is worthwhile
indeed due to low cost. MUSIC-34I electronic tube integrated
amplifier sells around RMB3, 000. Taking its sound performance
into consideration, I think the price is over value
and the machine is worthy of recommendation.
Extracted from”¶Modern Audio Technology”·98 Tang Daoji
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