LUXMAN L-309V

Commentary

This is a pre-main amplifier that is an improved version of the L-309 and is one of the V series planned for the 50th anniversary of the foundation.

The main amplifier section uses a pure complimentary service OCL circuit directly connected to all stages of 2-stage differential-amplification by ± split power supply.
F for the driver stage^TIn addition, an emitter follower circuit is provided between the output stage of class B operation and the predrive stage of class A operation so that both stages are electrically isolated, and the predrive stage is not affected by the output stage. By improving the load condition of the high-frequency range of the predrive stage and applying a light phase correction, excellent distortion factor characteristics over the entire band are achieved.

The output stage of the equalizer circuit in the preamp section consists of a push-pull circuit with an inverted Darlington connection of class A operation with a high voltage applied to it, ensuring excellent input voltage resistance.
The operational amplifier IC that drives this output stage has a high bare loop gain and has frequency characteristics close to the equalizer curve. Sufficient NF is evenly applied over the entire band, and distortion factor characteristics are improved and excellent stability is obtained.
It is also equipped with a linear equalizer that adds a slight linear slope to the frequency response.

The intermediate amplifier circuit is a 2-stage direct-coupled type, and the tone control circuit is a LUX type NF type. The tone control frequency can be selected from three positions, high and low, and the circuit can be disconnected.

The filter circuit is CR type for low cut and LC type for high cut.

The power supply section is completely separated for the class B output stage, class A drive stage and preamplifier. The filter circuit for the output stage uses two 15,000 μ F large-capacity capacitors.

In terms of design, while keeping the conventional layout almost as it is, the color tone of the panel and knob is brightened to enhance the perfection.

Model Rating

Type	Pre-main amplifier
Continuous effective output	80W + 80W (8 Ω, both channel operation, 20 hz to 20 khz) 100W + 100W (4 Ω, both channel operation, 20 Hz to 20 kHz)
Total harmonic distortion factor	0.03% or Less (8 Ω, 80W)
Cross modulation distortion factor	0.03% or Less (8 Ω, 80W, 60 hz : 7 khz = 4 : 1)
Output bandwidth	5 Hz ~ 40 kHz -3dB (0.1%)
Input Sensitivity / Impedance	Phono1 : 2.5mV/30k Ω ~ 50k Ω ~ 100k Ω (continuously variable) Phono2 : 2.5mV/50k Ω Tuner : 150 mV (variable) / 40k Ω Aux1/2 : 150mV/50k Ω
Signal-to-noise ratio	Phono1/2 : 62 dB or more Tuner, Aux1/2 : 80 dB or more
Phono maximum allowable input	300 mV or More (RMS, 1 kHz)
Residual noise	0.5 mV or less
Damping factor	40 (8 Ω Load)
Tone control	LUX System NF Type with Bending Point Frequency 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	20 Hz, 70 Hz (-6dB/oct.)
High-cut filter	7 kHz, 12 kHz (-12dB/oct.)
Low boost	70Hz(+6dB/oct)
Attachment	Linear equalizer (for phono only) Tape dubbing circuit Tape monitor circuit Input impedance adjustment for Phono1 3-point switching attenuator High filter Low filter Speaker selector switch
Semiconductors used	Transistor : 47 IC : 1 Diode : 20 pcs Zener diode : 4 pcs Varistor : 6 pieces
Power consumption	300W (8 Ω, both channel operation, at rated output)
External dimensions	Width 485x Height 165x Depth 300 mm
Weight	15.5kg