ขาย Pre Amp หลอด LUXKIT A3400 รุ่นใหญ่ สภาพสวย เสียงดีมาก พร้อมใช้ Made in Japan
ขาย Pre Amp หลอด LUXKIT A3400 รุ่นใหญ่ สภาพสวย เสียงดีมาก พร้อมใช้ Made in Japan
LUXKIT A3400
¥ 108,000 (released in May 1974)
Commentary
Vacuum tube type control amplifier kit.
The equalizer circuit uses the K-K ・ NF type, which is close to the Marantz type, and was
newly developed after ascertaining the characteristics of the Marantz Model7 and
Macintosh C-22 circuits. In this A3400 circuit, the cathode resistance of the third stage
is divided into 33k Ω and 3.3k Ω to prevent the amount of NF in the ultra-high band from
becoming unnecessarily large. In addition, by locally applying NF from the third stage cathode
to the first stage plate, the bare characteristics before the major NF is applied are improved,
and the strain rate characteristics are improved.
The intermediate amplifier is a 3-pole tube 2-stage configuration. In order to suppress the gain
of the A3400 and not to worsen the distortion at high output, we have adopted a B-type
balancer (insertion loss is approximately -8dB) to provide an appropriate overall gain.
This is because in order to achieve a low gain at the 2-stage configuration, the high feedback
type inevitably reduces the negative feedback resistance, so this resistance becomes
the second stage plate load and prevents the distortion at high output from worsening.
By installing a linear equalizer in this stage and switching the feedback element,
frequency characteristics with a linear slope can be obtained over the whole band.
The tone control circuit uses the Lux-NF type.
Since a print switch is used for adjusting the low and high sound levels, flat characteristics
are improved and stable control is possible.
This circuit is also capable of defeat.
The output circuit uses a cathode follower to keep the output impedance low.
This stage is equipped with a filter that can switch the cut-off frequency in two stages for both
high and low frequencies. This is an NF type filter using a cathode follower, and it is
a genuine filter that cuts at a slope of -12dB per octave.
Internal
Model Rating
Type Tube type control amplifier kit
Output voltage Rating : 2 V (output level + 6 dB position)
Maximum : 15 v (0.3% strain rate)
Output impedance 550 Ω
Total harmonic distortion factor 0.06% or Less (Output 2 V, 55 Hz to 10 kHz)
Frequency characteristic 15 Hz to 35 kHz -1dB
Input sensitivity Phono1 : 2 mv, 4 mv, 10 mv (switching type)
Phono2:2mV
Mic:2.2mV
Aux1:170mV
Tuner, Aux2 : 170 mV (with level set)
Input impedance Phono1, 2 : 100k Ω, 50k Ω, 20k Ω
Aux1 : 150k Ω
Tuner, Aux2 : 100k Ω
Mic : 50k Ω
Signal-to-noise ratio Phono1, 2 : 64 dB
Mic:66dB
Tuner, Aux1, 2 : 77 dB
Tone control LUX System NF Type with Bending Point Switching
Low-pass curve point : 100 Hz, 250 Hz, 500 Hz
High-frequency bending point : 2 kHz, 4 kHz, 8 kHz
Filter Low-cut : 15 Hz, 80 Hz (-12dB/oct.)
High Cut : 12 kHz, 7 kHz (-12dB/oct.)
Attachment Linear equalizer (up tilt 2 stages, flat position, down tilt 2 stages)
Microphone amplifier
Headphone amplifier
Phono Input Sensitivity Switching
Output level switching
Vacuum tube used 12AX7x6
12AU7x1
Semiconductor used RA1Bx4
M4E1x1
1S-1850x1
1S-1850Rx1
S1R60x2
2SF657x1
N13T1x1
2SA493x3
2SC1000x4
2SA562x2
2SC735x4
KB265x2
External dimensions Width 435x Height 165x Depth 300 mm
Weight 9kg
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