Audio Database

L-3
Commentary

A pre-main amplifier with low output and low sound quality.

The power amplifier uses a pure complimentary service OCL system. In addition, the power transistor and other devices themselves are carefully selected and used, especially those with high high-frequency cutoff characteristics and low collector capacitance. The operating point is set in the part with good linearity of each transistor to improve the distortion factor characteristics over the entire band.

The equalizer circuit, flat amplifier circuit and tone amplifier circuit of the pre-amplifier section use a two stage direct connection system. By increasing the current supplied to each circuit, low impedance is achieved and high-frequency characteristics are improved.
In addition, the circuit is constructed by carefully selecting ultra-low-noise transistors, and by driving with a negative power supply, the SN ratio is improved.

In order to minimize the distance of each input system and to eliminate shield wires, an input terminal board is provided at the bottom.
In addition, the signal path has been simplified for flatter characteristics and higher S / N ratio.

It is equipped with functions such as LUX type NF tone control, monitoring and dubbing function with two tape decks, high and low filters, and loudness control.

There were 2 types of L-3, the silver type L-3 and the black type L-3B.

Model Rating
Type Integrated amplifier
Continuous effective output (both channel operation) 35W + 35W (8 ohm, 20 hz to 20 khz)
Total harmonic distortion rate (20 Hz to 20 kHz) 0.04% or Less (8 Ω, 35W)
Intermodulation distortion factor (60 hz : 7 khz = 4 : 1) 0.08% or Less (8 Ω, 35W)
Output bandwidth 10 Hz ~ 60 kHz -3dB (Distortion Factor 0.1%)
Frequency characteristic 15 Hz to 60 kHz - within 1 dB
Input Sensitivity / Impedance Phono : 2.5mV/50k Ω
Tuner, Aux : 145mV/50k Ω
SN ratio (IHF-A correction, input short) Phono : 72 dB or more
Tuner, Aux : 95 dB or higher
Damping factor 65 or More (8 Ω Load, 1 kHz)
Tone control LUX System NF Type (Left and Right Channels, Independent Level Control)
Filter Subsonic : 25 Hz, -6dB/oct.
High Cut : 7 kHz, -6dB/oct.
Attachment Tape monitor circuit (2 systems)
Tape dubbing circuit
Loudness control
Speaker selector (2 systems)
Mode switch
AC outlet Power switch interlock : 1 system
Power switch not linked : 1 system
Power supply voltage 100 VAC, 50Hz/60Hz
Power consumption (Electrical Appliance and Material Control Law) 100W
External dimensions Width 438x Height 105x Depth 313 mm
Weight 8kg