Red Diamond Audio

Discover those classic audio gems.


Marantz 1300 DC Integrated Amplifier.

Mint condition.

Marantz 1300 DC amplifier cover Marantz 1300 DC amplifier Marantz 1300 DC. Rear view. Marantz 1300 DC eq controls. Marantz 1300 DC amplifier


The Marantz 1300 DC is an integrated version of the Marantz  3650 pre-amplifier and the 300 DC power amplifier. Two sets of speakers can be connected, and it’s capable of driving with ease difficult loads. With a nominally 4 ohm speaker connected, 190 watts RMS/channel can be delivered.

So other than sheer power, exactly why does the Marantz1300DC sound so good? How about the huge power supply incorporating a  massive dual secondary transformer, quality discrete electronic components, a rigid strong chassis with huge heatsinks and DC coupling to the speakers.

The unit weighs in at 24.5 Kg, an exceptionally  high figure for an integrated unit.

There are separate left and right graphic stepped controls for bass, midrange and treble with a turnover frequency selector and band width equalizer. The equalisation can be entirely switched out to provide a more direct path for the input signal to the output stages.

There is also full tape monitoring and dubbing facilities which allows for the recording of any input, and simultaneous monitoring or listening to any other input.

There are also two phono inputs, one for moving coil cartridges (which is switchable to a magnetic cartridge input), and another dedicated magnetic input. The cartridge load impedance and capacitance settings for a magnetic cartridge is adjustable by two controls on the front panel. The moving coil input presents a useful load of 50 ohms which suits many MC cartridges (the likes of Koetsu, for instance).

A rather nice touch is the “contour” knob on the front panel, a  variable loudness control if you will, enhancing low level listening.

The Marantz 1300 DC is always well balanced, regardless of the source. It just sounds “right”. There is no emphasis of any particular frequency with no veiling, just a deep punchy LF and a sweet sweeping HF capability.

Regrettably, the 1300 DC was only produced by Marantz for a single year between 1978-79. The result is that this model rarely comes to the market, let alone one in this condition. I continue to own a 1300 DC for my personal use.


RMS Power Per Channel 152 @ 8, 190 Watts @ 4

Damping Factor @ Load Impedance 60, 8 Ohms, 20 Hz

Total Harmonic Distortion (THD) 0.02% (8 Ohms),

0.05% (4 ohms), both @ full power

Power Bandwidth: DC to 30 kHz

Frequency Response: +0 dB, -1 dB, 5 Hz-60KHz

Signal to noise ratios:

Phono (MC): 76dB

Phono (MM): 90 dB

Aux: 100 dB

Main in: 110 dB

Intermodulation Distortion (IM): 0.03% @ 8 Ohms, 0.09% @ 4 ohms both @ full power

Input Impedance: 30 k-ohms

Input Sensitivity for Full Output: 1.5 v for full output

Gain Control(s): One Per Channel

DC Capable: Yes, switchable

Meter Range Off, 0 dB, -10 dB, -20 dB

Peak Lamp(s): Two

Phono Input terminals

Impedance:  (MC) 50 ohms                                 

Selectable Impedance:  (MM) 100K/47K/27K/10K/1K ohms

Input capacitance: (MM)100pF/150pF/220pF/330pF/470pF

Input sensitivity:   (MC) 100 micro volts

                         (MM)  2.0 milli volts

Voltage switchable: 110/120/240 volts.

Power consumption with both channels operating: 575 watts

Idling power:  90 watts

Dimensions  416 mm (W), 146 mm (H), 436 mm (D)

Weight 24.5 Kg   

Price: £2950.00
Please contact RDA for shipping and delivery details




The item  is being sold by Reddiamond Audio, located in Jedburgh, Scotland.

A guarantee of 6 months will be given from the date of purchase. In keeping with the ethos of Reddiamond Audio, support and advice will be given to ensure the buyer has many years of service from  this unit. If possible, it is the preferred option that the item  is personally delivered and installed in the purchaser’s home for the cost of fuel only.

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The Marantz 1300 DC integrated amp is one of the US greats, epitomizing a well designed and beautifully engineered, versatile amp. Designed in the US but built in Japan, it came along at a time when the very best audio equipment was produced by both those countries, just before misguided marketing departments were responsible for reducing audio equipment to homogeneous boxes. These were the halcyon days when great audio companies such as Marantz, Sony, Luxman, McIntosh etc. competed to produce innovative, flagship products.

Marantz 1300DC amplifier. Internal view Marantz 1300DC amplifier. Internal view

© Red Diamond Audio 2014