DENON PMA-1500R

Commentary

A pre-main amplifier with UHC-MOS, inheriting S series technology.

In order to solve the conflicting problems of delicate expressive power and speaker drive, we have adopted a high-current amplifier UHC-MOS with a peak current of 120A at the output stage, which has a current supply capability 3 to 10 times that of the normal one.
The UHC-MOS is an element with improved current supply power equal to or higher than that of a bipolar transistor and also has the sound quality advantage of a MOS-FET. By mounting it in a single push-pull configuration, variations in amplification operation are eliminated.

L. C (Leakage Canceling) mount twin transformer is adopted.
The DENON POA-S1 monaural power amplifier employs a twin transformer parallel connection that greatly improves the characteristics of both the magnetic circuit and the winding circuit. In addition, the L. C mount that cancels out magnetic and other effects reduces the leakage flux of the power transformer, which is a source of noise in the amplifier, and realizes high power supply capability and low noise.

The rectifier circuit uses technology developed by DENON's pre-main amplifier PMA-S1.
We use a large high-speed rectifier diode (fast recovery diode) with excellent large-current supply capability to cope with high speed and large current, and use a high-sound condenser for the power supply condenser.

In order to eliminate degradation of sound quality due to interference between circuits and inflow of noise, power amplifier blocks are made independent. In addition, other circuits with different signal levels are also made into separate block structures, thereby eliminating the influence of interference between each block on sound quality.
In order to ensure high rigidity, the chassis is used after carefully examining the thickness of the copper plate. In addition, a transformer base and special rubber have been added to the power transformer part to ensure good vibration.

The speaker terminals are brass machined and gold-plated to enable more reliable connections.
In addition, it is equipped with two terminals for biwiring.

Built-in pre-out terminal.

The phono equalizer uses a discrete first stage circuit that uses a low-noise FET.
Both MM and MC cartridges can be used by switching the switch.

Highly reliable parts such as gold plated terminals, carbon resistance, and capacitors are used.
In addition, an extra-thick power cord of the inlet type is used to lower the power impedance.

It comes with a system remote control and supports CDs, cassette decks, and tuners.
The power supply for the control circuit of the remote controller is equipped with an independent power transformer to minimize interference with the audio circuit.

There are 2 variations, gold and black.

Model Rating

Type	Pre-main amplifier
Power Amplifier Unit
Rated Output (Both channel driven, CD → SP out)	70W + 70W (8 Ω, 20 Hz to 20 kHz) 140W + 140W (4 ω, 1 kHz)
Total harmonic distortion factor	0.01% (8 Ω at -3dB rated output, 1 kHz)
Output terminal	Speaker AORb : 4 Ω ~ 16 Ω Speaker A + B : 8 Ω ~ 16 Ω Biwiring : 4 Ω ~ 16 Ω
Preamplifier Section
Input Sensitivity / Impedance	Line : 150mV/47k Ω (source direct off) 150mV/13k Ω (source direct on) Phono MM : 2.5mV/47k Ω Phono MC : 0.2mV/100 Ω
Equalizer amplifier output (Rec out jack)	Rated 150 mv
RIAA deviation	20 Hz to 20 kHz ± 0.5 dB
<General>
SN ratio (when A network and input terminal are short-circuited)	Line:110dB Phono MM : 91 dB (at 5 mV input) Phono MC : 76 dB (at 0.5 mV input)
Tone control	Bass : ± 8 dB (100 Hz) Treble : ± 8 dB (10 kHz)
Loudness	Bass:+10dB(50Hz) Treble:+5dB(10kHz)
Power outlet	Switched : Route 3, 120W total
Power supply voltage	100 VAC, 50Hz/60Hz
Power consumption	250W Standby : Approx. 5W
External Dimensions (including legs, knobs, terminals)	Width 434x Height 134x Depth 407 mm
Weight	14.0kg
Attachment	System remote control