A preamplifier kit that is a kit of LUXMAN's tube control amplifier CL32.
The three-stage cathode-cathode NF circuit which adopted the SRPP (shunt regulated push-pull) output circuit is adopted as an equalizer amplifier part, and the feedback is applied from the output stage to the cathode of the first stage. The distortion rate is kept low by this circuit, and the high input resistance characteristic and the high SN ratio are realized.
The two-stage plate-cathode NF circuit is adopted as a flat amplifier part, and the feedback is applied from the cathode of the second stage to the plate of the first stage. In addition, local feedback is applied between plates to improve the bare characteristics before applying major NF.
The cathode follower circuit is adopted as an output stage.
The quadruple type volume is adopted as a volume, and the SN ratio is improved at a practical level.
The new filter is adopted for low-pass cut, the active element is not increased, the influence on the audible frequency band is minimized, and only the ultra-low frequency of 5Hz to 10Hz is effectively cut. ..
The shielded wire of the signal path is almost eliminated, and the input circuit is also wired in the shortest path to ensure long-term stability and excellent characteristics.
The power transformer using a cut core is adopted as a power-source part. Moreover, the direct current ignition by the constant voltage circuit is adopted as a heater power supply, and the mixing of pulse noise is prevented.
The crosstalk characteristics are improved by separating the left and right vacuum tubes except for the cathode follower of the output stage.
There was a muting circuit kit as an option sold separately.
With this kit, you can disconnect the output circuit until the operation is stable.
||Tube control amplifier kit
Maximum: 15V (distortion rate 0.3% or less)
||Pre out: 600Ω
Rec out: 560Ω
|Total harmonic distortion
||0.03% or less (output 2V, 20Hz to 15kHz)
||Within 10Hz-40kHz -1dB
||Within 30Hz to 15kHz ± 0.5dB
||-65dB or less
|Input sensitivity (output 1V)
: 2mV Tuner, Aux2: 160mV-5V (variable)
||Phono1: 30kΩ ～
50kΩ ～ 100kΩ Phono2:
50kΩ Aux1: 200kΩ
Tuner, Aux2: 100kΩ
|SN ratio (IHF-A correction
, input short)
80dB or more Tuner, Aux: 95dB or more
|Phono permissible input
||560 mV or more (1 kHz, RMS)
Filter for ultra-low range
Tape monitor 2 systems
Tape dubbing For
Phono1 Input impedance adjustment
Tuner, Aux2 Input level set
|Vacuum tube used
||12AX7 / ECC83x5
12AU7 / ECC82x2
||AC100V, 50Hz / 60Hz
||Width 438 x Height 77 x Depth 322 mm
||Muting circuit kit OP3032 (¥ 2,500)