Vintage
Stereo Amplifier

Marantz 4140

vintage hifi stereo (1)



Best vintage stereo amplifier studied on vintageshifi.com, with their instructions, service manual, and for the most part the list of transistors and their equivalents to carry out a careful restoration. Come explore these some 120 pages devoted to these bestsellers of the hifi and take the time to browse the site. When it comes to reproducing and amplifying sound, some of our older stereo amplifiers have nothing to envy today′s audiophile devices. Their only problems are the resistance over time of their most sensitive components. It is for this reason that it is better to buy restored devices, and it is even preferable to choose a device of a certain level of the range from one of the best reputable manufacturers specialized in high fidelity. The extent of our hearing field has not changed (20-20.000 Hz). You can buy a vintage amplifier, but some devices! Yesterday like today everything is not advisable.

Here are some devices: Akai AM 2400, Marantz 1030, Marantz 1070, Marantz 1090, Marantz 4140, Marantz PM 400, Nad 3020E, Pioneer SA 506, Pioneer SA 508, Pioneer SA 9100, Rotel RA 611, Sansui A80, Sansui AU 505, Sansui AU 666, Sansui AU 999, Sansui AU 20000, Sansui AU 11000, Sanyo DCA 611, Sony TA 2650, Technics SU-7700, Scott 255S, Scott A426 and many other vintage hi-fi bestsellers.




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AKAI AM 2250

AKAI AM 2250 (1979)


AMPLIFIER, Power (RMS) 2X25 w.
Frequency response: 10Hz/40kHz,
Output Impedance: 8 ohms
Total Harmonic output: 0,2% 8 ohms,
Damping factor: 50.

Equivalent transistors and list
of available electrolytic capacitors
Service Manual, Owner's Manual available



AKAI AM 2350

AKAI AM 2350 (1979)


AMPLIFIER, Power (RMS) 2X35 w.
Frequency response: 10Hz/40kHz,
Output Impedance: 8 ohms
Total Harmonic output: 0,2% 8 ohms,
Damping factor: 30.

Equivalent transistors and list
of available electrolytic capacitors
Service Manual available



AKAI AM 2400

AKAI AM 2400 (1976)


AMPLIFIER, Power (RMS) 2X40 w.
Frequency response: 7Hz/40kHz,
Output Impedance: 8 ohms
Total Harmonic output: 0,15% 8 ohms,
Damping factor: 60.

Equivalent transistors available
Service Manual, Owner's Manual available



AKAI AM 2450

AKAI AM 2450 (1979)


AMPLIFIER, Power (RMS) 2X45 w.
Frequency response: 6Hz/60kHz,
Output Impedance: 8 ohms
Total Harmonic output: 0,1% 8 ohms,
Damping factor: 30.

Equivalent transistors available
Service Manual available



AKAI AM 2600

AKAI AM 2600 (1976)


AMPLIFIER, Power (RMS) 2X60 w.
Frequency response: 7Hz/40kHz,
Output Impedance: 8 ohms
Total Harmonic output: 0,1% 8 ohms,
Damping factor: 60.

Equivalent transistors available
Service Manual available




AKAI AM 2800

AKAI AM 2800 (1976)


AMPLIFIER, Power (RMS) 2X80 w.
Frequency response: 7Hz/40kHz,
Output Impedance: 8 ohms
Total Harmonic output: 0,08% 8 ohms,
Damping factor: 60.

Equivalent transistors available
Service Manual available



AKAI AM 2850

AKAI AM 2850 (1979)


AMPLIFIER, Power (RMS) 2X85 w.
Frequency response: 10Hz/40kHz,
Output Impedance: 8 ohms
Total Harmonic output: 0,08% 8 ohms,
Damping factor: 50.

Equivalent transistors available
Service Manual available



Harman Kardon pm 665

HARMAN KARDON PM 665 (1982)


AMPLIFIER, Power (RMS) 2X100 w.
Frequency response: 2Hz/150kHz,
Output Impedance: 8 ohms
Total Harmonic output: 0,08% 8 ohms,
Damping factor: 60.

Equivalent transistors available
Service Manual available



Kenwood KA 405

KENWOOD KA 405 (1979)


AMPLIFIER, Power (RMS) 2X55 w.
Frequency response: 20Hz/20kHz,
Output Impedance: 8 ohms
Total Harmonic output: 0,05% 8 ohms,
Damping factor: 45.

Equivalent transistors available
Service Manual available



Stereo Amplifier Luxman L30

LUXMAN L30 (1977)


AMPLIFIER, Power (RMS) 2X32 w.
Frequency response: 10Hz/50kHz,
Output Impedance: 8 ohms
Total Harmonic output: 0,05% 8 ohms,
Damping factor: 90.

Equivalent transistors available
Service Manual, Owner's Manual available



Stereo Amplifier Luxman L31

LUXMAN L31 (1977)


AMPLIFIER, Power (RMS) 2X38 w.
Frequency response: 15Hz/50kHz,
Output Impedance: 8 ohms
Total Harmonic output: 0,5% 8 ohms,
Damping factor: 90.

Equivalent transistors available
Service Manual available



Stereo Amplifier Luxman L81

LUXMAN L81 (1976)


AMPLIFIER, Power (RMS) 2X45 w.
Frequency response: 5Hz/50kHz,
Output Impedance: 8 ohms
Total Harmonic output: 0.1% 8 ohms,
Damping factor: 40.

Equivalent transistors available
Service Manual available



Stereo Amplifier Luxman L100

LUXMAN L100 (1976)


AMPLIFIER, Power (RMS) 2X110 w.
Frequency response: 5Hz/50kHz,
Output Impedance: 8 ohms
Total Harmonic output: 0,07% 8 ohms,
Damping factor: 50.

Equivalent transistors and list
of available electrolytic capacitors
Service Manual, Owner's Manual available




Stereo Amplifier Luxman L550

LUXMAN L550 (1982)


AMPLIFIER, Power (RMS) 2X50 w.
Frequency response: 10Hz/100kHz,
Output Impedance: 8 ohms
Total Harmonic output: 0,005% 8 ohms.

Equivalent transistors available
Service Manual, Owner's Manual available



Marantz 1030

MARANTZ 1030 (1973)


AMPLIFIER, Power (RMS) 2X15 w.
Frequency response: 20Hz/20kHz,
Output Impedance: 8 ohms
Total Harmonic output: 0,5% 8 ohms,
Damping factor: 45.

Equivalent transistors available
Service Manual available



Marantz 1040

MARANTZ 1040 (1974)


AMPLIFIER, Power (RMS) 2X20 w.
Frequency response: 20Hz/20kHz,
Output Impedance: 8 ohms
Total Harmonic output: 0,3% 8 ohms,
Damping factor: 20.

Equivalent transistors available
Service Manual available



Marantz 1060

MARANTZ 1060 (1971)


AMPLIFIER, Power (RMS) 2X30 w.
Frequency response: 20Hz/20kHz,
Output Impedance: 8 ohms
Total Harmonic output: 0,5% 8 ohms,
Damping factor: 45.

Equivalent transistors available
Service Manual available



Marantz 1070

MARANTZ 1070 (1974)


AMPLIFIER, Power (RMS) 2X35 w
Frequency response: 20Hz/20kHz,
Output Impedance:4,8 ohms
Total Harmonic output: 0,3% 8 ohms,
Damping factor: 20.

Equivalent transistors available
Service Manual available



Marantz 1072

MARANTZ 1072 (1978)


AMPLIFIER, Power (RMS) 2X36 w
Frequency response: 15Hz/60kHz,
Output Impedance:4,8 ohms
Total Harmonic output: 0,05% 8 ohms,
Damping factor: 45.

Equivalent transistors available
Service Manual available



Marantz 1090

MARANTZ 1090 (1977)


AMPLIFIER, Power (RMS) 2X50 w
Frequency response: 10Hz/70kHz,
Output Impedance: 8 ohms
Total Harmonic output: 0,1% 8 ohms,
Damping factor: 35.

Equivalent transistors available
Service Manual available



Marantz 1122 DC

MARANTZ 1122 DC (1978)


AMPLIFIER, Power (RMS) 2X61 w
Frequency response: 5Hz/60kHz,
Output Impedance: 8 ohms
Total Harmonic output: 0.03% 8 ohms,
Damping factor: 60.

Equivalent transistors available
Service Manual available



Marantz 1150 D

MARANTZ 1150 D (1976)


AMPLIFIER, Power (RMS) 2X75 w
Frequency response: 5Hz/50kHz,
Output Impedance: 8 ohms
Total Harmonic output: 0.1% 8 ohms.

Equivalent transistors available
Service Manual available



Marantz 1180 DC

MARANTZ 1180 DC (1978)


AMPLIFIER, Power (RMS) 2X90 w
Frequency response: 5Hz/60kHz,
Output Impedance: 8 ohms
Total Harmonic output: 0.03% 8 ohms,
Damping factor: 60.

Equivalent transistors available
Service Manual available



Marantz 4140

MARANTZ 4140 (1973)


AMPLIFIER, Power (RMS) 2X70 w
Continuous Power (RMS) 25 watts x 4/8 ohms
Frequency response: 7Hz/70kHz,
Output Impedance: 8 ohms
Total Harmonic output: 0.3% 8 ohms,
Damping factor: 40.

Equivalent transistors available
Service Manual available



Marantz pm 400

MARANTZ PM 400 (1980)


AMPLIFIER, Power (RMS) 2X36 w
Frequency response: 20Hz/50kHz,
Output Impedance: 8 ohms
Total Harmonic output: 0.05% 8 ohms,
Damping factor: 100.

Equivalent transistors available
Service Manual available



Marantz pm 500

MARANTZ PM 500 (1980)


AMPLIFIER, Power (RMS) 2X50 w
Frequency response: 10Hz/60kHz,
Output Impedance: 8 ohms
Total Harmonic output: 0.03% 8 ohms,
Damping factor: 110.

Equivalent transistors available
Service Manual available



McIntosh MA 6900

MCINTOSH MA 6900 (2000)


AMPLIFIER, Power (RMS) 2X200 w.
Frequency response: 20Hz/20kHz,
Output Impedance: 8 ohms
Total Harmonic output: 0.005% 8 ohms,
Damping factor: 40.

Owner's Manual available
Service Manual, brochure available



Nad 3020E

NAD 3020E (1980)


AMPLIFIER, Power (RMS) 2X25 w
Frequency response: 20Hz/20kHz,
Output Impedance: 8 ohms
Total Harmonic output: 0.05% 8 ohms.

Equivalent transistors and list
of available electrolytic capacitors
Service Manual available



Nad 3130

NAD 3130 (1985)


AMPLIFIER, Power (RMS) 2X30 w
Frequency response: 20Hz/20kHz,
Output Impedance: 8 ohms
Total Harmonic output: 0.03% 8 ohms.

Equivalent transistors available
Service Manual, Owner's Manual available



Nikko na 550

NIKKO NA 550 (1978)


AMPLIFIER, Power (RMS) 2X50 w
Frequency response: 10Hz/50kHz,
Output Impedance: 8 ohms
Total Harmonic output: 0.08% 8 ohms,
Damping factor: 60.

Equivalent transistors available
Service Manual available



Nikko na 1090

NIKKO NA 1090 (1980)


AMPLIFIER, Power (RMS) 2X63 w
Frequency response: 5Hz/45kHz,
Output Impedance: 8 ohms
Total Harmonic output: 0.02% 8 ohms,
Damping factor: 50.

Equivalent transistors available
Schematics available



Nikko TRM 650

NIKKO TRM 650 (1978)


AMPLIFIER, Power (RMS) 2X50 w
Frequency response: 20Hz/20kHz,
Output Impedance: 8 ohms
Total Harmonic output: 0.07% 8 ohms.

Equivalent transistors and list
of available electrolytic capacitors
Schematics available



Vintage Hifi | Préamplifier



Marantz 3200

MARANTZ 3200 (1973)


PREAMPLIFIER,
Frequency response: 20Hz/70kHz,
Total Harmonic output: 0.1%.
Out Put: 0.5v

Equivalent transistors available
Service Manual available




Marantz 3250B

MARANTZ 3250 B (1978)


PREAMPLIFIER,
Frequency response: 5Hz/60kHz,
Total Harmonic output: 0.01%.
Out Put: 3v to 10v

Equivalent transistors available
Service Manual available



Sansui CA 3000

SANSUI CA 3000 (1975)


PREAMPLIFIER,
Frequency response: 20Hz/70kHz,
Total Harmonic output: 0.03%.
Out Put: 1.3v

Equivalent transistors available
Service Manual, Owner's Manual available



QUAD 34

QUAD 34 (1982-96)


PREAMPLIFIER,
Frequency response: 30Hz/20kHz,
Total Harmonic output: 0.05%.
Out Put: 0.5v

Service Manual, Owner's Manual available