LUXMAN L-504 Integrated Stereo Amplifier 70Watts RMS Vintage 1973 Work Good Look

LUXMAN L-504 Integrated Stereo Amplifier 2 x 35 Watts RMS Vintage 1973 Work Good Look

Import From JAPAN al ORIGINAL

WORKING PERFECT - on 100, 120 Volts or 220 and 240 Volts (with EXTERNAL TRANSFORMER inclued for FREE)

LUXMAN L-504

78,000yen(October, 1973 release)

Description

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The Integrated Amplifier announced as a SQ-505 type succeeding machine.

The main-amplifier part is designed for the purpose of removing crossover distortion in which it is difficult to remove with B class push pull amplifier, and the notching distortion especially in a high region as much as possible.

The PNP type and NPN type transistor which were excellent in the high region property were appointed as B class driver stage, and the power transistor for pure complimentaries which was developed for LUX and which was excellent in the destructive-proof property which does not spoil a high region property is adopted as the power stage.

By adopting the differential-amplification circuitry by constant current drive, and driving from a non-signal time with a fixed electric current till the maximum output, the pre-driver stage maintains B class operation stage at the status that it was stabilized, and is suppressing notching distortion to the relative minimum. The transistor of this stage has high high region cut-off frequency (ft), especially, few things of the collector output capacitance (Cob) were adopted, and the distortion of the high region has also acquired the almost same value as 1kHz over full power.

All the transistors currently used for a main-amplifier part arranged the can type, and have secured moisture resistance, an endurance, and hi-reliability.

The gentle LUX scheme NF type of a transition property is used for a tone control circuit. "Height level adjustment" with a click stop, "height each curving point frequency switching" of every two points, and independent "tone-defeat switchpoint" are carried in organization.

The equalizer circuitry has obtained the linearity and high SN ratio which are a 3 steps of �� hardwired-connection circuitry which is a stream composition, and were excellent in the super-low-noise type transistor of NPN-PNP-NPN with an advantageous voltage utilization factor. Distortion has acquired the outstanding numeric value, when a current amplification factor (hfe) adopts a transistor with a sufficient linearity highly.

Direct-current stability is raised fully applying a direct-current feedback to this circuitry. Moreover, the deflection with a RIAA curve is dedicated to less than �}0.5dB by making the allowable error of a using part small and suppressing variation as much as possible.

It is used for the capacitor used for an input circuit and an output circuit from the inside of a Mylar type with little leakage current, and a tantalum type, selecting carefully to it further. This is holding down the unpleasant shocking noise at the time of a switchpoint switching to the relative minimum.

Two 6800-micro F electrolytic capacitors are used for the filter circuit of a power-source part. The stable power source is realized in combination with the good power transformer of a regulation.

Power-switch ON and the muting circuit which separates a speaker circuitry at the time of OFF are prepared in the measure against a shocking noise at the time of power activation and a shutdown, and the duty of the speaker protection is also achieved.

Two speaker outputs, a main and remote, are carried and it can be used separately or simultaneous.

The Attenuator switchpoint is carried and a sound volume of -18dB can be carried out with a one button.

Form Stereo integrated amplifier

Succession effective output 35W+35W (8 ohms, both channel simultaneous operation)

40W/40W (ohms [ 8 ], one-side-channel operation)

THD 0.03% or less (8ohm, 35W)

Cross modulation distortion 0.04% or less (8ohm, 35W, 70Hz:7kHz=4:1)

Output bandwidth 5Hz - -50kHz three dB (0.1%)

Frequency characteristic 10Hz - -60kHz one dB

Input sensitivity 480mV (8ohm, 35W)

Impedance 50kohm

Remains noise 0.5mV or less

Dumping factor 35 (at the time of an 8-ohm load intensity)

Attachment Attenuator (-18dB)

Main speaker switchpoint

Remote speaker switchpoint

Headset jack

Standard output voltage Pre out:480mV

Rec out:120mV

Maximum output voltage Pre out:4.5V

Output load impedance Pre out: About 100ohms

Rec out: About 100ohms

Frequency characteristic Aux1:10Hz-50kHz-1dB

THD 1:0.04% or less (1kHz, 1V) of Aux

Input sensitivity Phono1, 2:2.7 mV

Tuner, aux1, 2:120mV

Input impedance Phono1, 2:65kohm

Tuner, aux1, 2:50kohm

SN ratio Phono1, 2:65dB or more

Tuner, aux1, 2:76dB or more

Maximum permissible input (1kHz) Phono: 300mV (R-M-S)

850mV(P-P)

Remains noise About 25 microvolts or less

Tone control With a curving [ LUX scheme NF type ] point switching

The point curving [ low-pass ]: 150Hz, 300Hz

The point curving [ high region ]: 3kHz, 6kHz

Attachment Tapes monitor switchpoint (two lines)

Tapes dubbing mode switch

Tapes connector (DIN specification)

The semiconductor used

Transistor : 1345:10 2SCs

640:4 2SCs

2SA620K: One piece

2SC1103A: Four pieces

660:4 2SAs

959:2 2SCs

2subset-dependency188A: Two pieces

2SB545A: Two pieces

853:1 2SCs

735:3 2SCs

562:1 2SAs

496:1 2SCs

Diode : 1S1555V: Two pieces

1N4003: 4 piece

1S188:4 piece

Five B3:1 pieces

Zener diode : 120:2 WZ(s)

Varistor : SV-03: 2 piece

SV-02: 2 piece

Power consumption 150W (at the time of an 8-ohm simultaneous load intensity and the maximum output)

Dimensions Width 450x height 160x depth of 268mm

Weight 10kg