LUXMAN CL350

Commentary

The first control amplifier using transistors.

The equalizer circuit is based on a 3-stage direct-coupled circuit that combines PNP and NPN types, and the third stage adopts a push-pull operation method that combines PNP and NPN type transistors in a pair to increase the power supply utilization factor and ensure good linearity.

Low-level circuits, such as Phono and Mic, generally consist of a single equalizer amplifier, which selects the input terminal by switching three points : the input circuit, the output circuit and the equalization constant.
In CL350, each input terminal has its own amplifier and the input terminal is selected only on the output circuit side. This simplifies the wiring of the input circuit side and reduces the adverse effect of shield wires and shock noise at switching.

The tone control is an NF type LUX tone control, and the bending point frequency is a 3-step switching type for fine tone adjustment.
This circuit has a defeat switch and can be skipped if it is not used.

The high-cut and low-cut filters have two cut-off frequencies, so that noise can be attenuated while minimizing the effect on the program source.

The noise level is kept low by mainly composed of PNP type ultra-low noise silicon transistors which are easy to obtain a noise figure in general.

It has a built-in low frequency trimmer that adjusts the frequency band centered from 150 Hz to 300 Hz in seconds.
This circuit is located behind the equalizer circuit to reduce the effect on the recorded output.

A headphone amplifier with level control is built-in.
The circuit consists of a pure complimentary service circuit directly connected to all stages, with an output capacitor.

Equipped with an attenuator.

Phono1 terminal is equipped with impedance switching, and Phono2 is equipped with a socket for MC-type step-up transformer.
The Aux1 and 3 jacks are equipped with level sets.

There were 2 types of exterior, Shiraki and Rosewood, similar to the power amplifier M150.

Model Rating

Type	Control amplifier
Frequency characteristic	10 Hz to 50 kHz -1dB
Total harmonic distortion factor	0.03% or Less (Output 1 V)
Output voltage	Rating : 1 v Maximum : 7 v (0.3% strain rate)
Output impedance	Pre out : 100 Ω
Input sensitivity	Phono1/2:2mV Aux1/3 : 110 mV (Variable) Aux2, Tape1/2 : 110 mv Mic:2.3mV
Input impedance	Phono1 : 100 Ω, 50 Ω, 30k Ω switching type Phono2 : 50k Ω Aux1/3 : 50k Ω Aux2 : 100k Ω Mic : 50k Ω Tape1/2 : 130k Ω
Signal-to-noise ratio	Phono : 63 dB or more Aux, Tape : 80 dB or more Mic : 59 dB or more
Input voltage resistance	Phono : 300 mV or more
Equalizer	RIAA : 30 Hz to 15 kHz ± 0.3 dB
Tone control	LUX System NF Type with Bending Point Switching Low-pass curve point : 150 Hz, 300 Hz, 600 Hz High-frequency bending point : 1.5 kHz, 3 kHz, 6 kHz
Low-cut filter	25 Hz, 60 Hz
High-cut filter	7 kHz, 12 kHz
Low frequency trimmer	± 0.6 dB at 250 Hz
Attenuator	-15dB
Headphone out	80mW
Attachment	Tape monitor circuit Tape dubbing circuit
Semiconductor used	Silicon transistor : 49 units Diode : 8 pcs
External dimensions	Width 476x Height 182x Depth 244 mm
Weight	8.8kg