Audio Database

The

DENON PMA-510
49,800yen(around the 1980 time)

Description
 
The Integrated Amplifier which adopted 2 amplifier composition of super equalizer amplifier and power amplifier.

Basic composition is considered as 2 amplifier composition of only the MC/MM super equalizer amplifier carried by PMA-550/PMA-540, and non switching A power amplifier, supplies the technology of DENON, and is raising completeness.

The direct direct-current servo system which banished the coupling capacitor leading to sound quality degradation is adopted.
The signal course serves as a Capacitor-Less design, and even SP output terminal does not have a coupling capacitor which affects sound quality from MC input terminal.

The equalizer amplifier part carries the super equalizer which consisted of the NF form direct-current amplifier and CR form equalizing filters by low noise dual FET, and has realized super-broadband-ization.
Moreover, in order to demonstrate the merit of a super equalizer, a focus is united with MC cartridge also with a gain and S/N, and it is designed.

The non switching A system which carries a zero crossing linear bias circuit is adopted as a power amplifier part.
In a zero crossing linear bias circuit, it is carrying a high speed thermal feedback circuit,While developing the merit of non switching further and attaining stabilization of speedy bias from the time of a power-source injection, high stability is acquired also to external factors, such as a temperature change and time progress.

The active device and the mass capacitor carry the real-time tone control circuit by which it is not placed between signal courses in the tone control part.
In this circuit, wide-range and smooth control is enabled with the technique of including a passive device in the return system of power amplifier.

Making direct connection all the input-and-output terminals with a printed circuit board, an input-and-output change is making it operate with the aluminum shaft of a nonmagnetic material, and is suppressing leading about of wires to the minimum.

The REC-OUT OFF function is carried in consideration of the influence on sound quality.
Moreover, a Subsonic Filter and loudness control are carried.

Rear

Rating of a mode
Form Integrated Amplifier
<Power amplifier part (Tuner in->SP out)>
Output power
(both channel drive, a sine wave continuation output, 20Hz - 20kHz)
70W+70W (4ohms)
50W+50W (8ohms)
Input sensitivity/impedance 150mV/40kohm
THD (20Hz - 20kHz, Output-power-3dB) 0.009% or less
Cross modulation distortion
(an equivalent for 60Hz:7kHz=4:1 and an Output power)
0.004% or less (at the time of 25W equivalent amplitude output)
Output bandwidth (IHF, both ch(es) drive) 5Hz - 80kHz (THD0.1%)
Frequency response (at the time of 1W output) 4Hz-150kHz+0 -3 dB
Output load impedance (1kHz) 0.13ohm
Speaker output AorB: 4ohms - 16ohms
<Preamplifier part (Input sensitivity/impedance is removed and it is Phono in->Rec out)>
Input sensitivity/impedance Phono MM: 2.5mV/50kohm
Phono MC: 0.25mV/100 ohms
Tuner, AUX, Tape:150mV/40kohm
The maximum except take-off/Output power 10V/150mV
RIAA deflection (MM, MC) 20Hz-100kHz±0.3dB
THD (at the time of 1kHz and 6V output) 0.002% or less
<Synthesis>
Signal to noise ratio (IHF-A, input short circuit) Phono MM: 86dB (at the time of a 2.5mV input)
Phono MC: 70dB (at the time of a 0.25mV input)
Tuner, AUX, Tape: 104dB
Tone control Bass: ±8dB (100Hz)
Treble: ±8dB (10kHz)
Subsonic Filter 18Hz, 6 dB/oct
Loudness control 100Hz : +7.5dB, 10kHz : +7.5dB
Power supply voltage AC100V, 50Hz/60Hz
Power consumption (Electrical Appliance and Material Control Law) 130W
Dimensions Width 434x height 112x depth of 390mm
Weight 9.2kg