Audio Database

The

DENON PMA-501
59,800yen(around the 1977 time)

Description
 
The Integrated Amplifier which carries the newly developed PCC system in order to pull out the characteristic of a record.
The cost cut is achieved giving composition almost equivalent to PMA-701.

PCC (Phono crosstalk canceller) is equipment which adds and negates a reverse cross talk to the cross talk of a phone pickup system, and it is operating two knobs using the attached record for adjustment -- the most sensitive frequency band to a lug -- about -- an improvement is possible to -40dB.

The power amplifier part consists of differential amplification whole page direct connection OCL circuits, it is low impedance power supply circuit composition, and a new style power transistor, such as double epitaxial structure and the Mie diffusion structure, is adopted as an output final stage, respectively.

In order to protect a speaker from an operation mistake or an accident, speed of response builds in the very quick reliable protection circuit.
Moreover, in consideration of the influence on sound quality, the relay of special structure is adopted also about a relay.

In order to improve the cross talk by interference between channels, the mutual intervention is reduced by separating the power source of the circuit composition which made the way become independent 2 system, and a power circuit with much current, and the power source of a preamplifier circuit with little current.

In order for the small signal sent from a record player to prevent deteriorating by leading about and the change-over switch of wiring, a phone input circuit is made into one line, and the input terminal is made to link with equalizer amplifier directly.
A shield line and stray capacitance could be made small by this, and input impedance is improved.

In order to improve a dynamic cross talk, 2 power transformer systems are adopted as a power-source part, and also it has Puri Maine another winding wire power transformer structure.


Rating of a mode
Form Integrated Amplifier
<Power amplifier part>
Circuit system Differential amplification whole page direct connection
pure complimentary OCL circuit
Dynamic output (IHF) 160W (80W+80W, 8ohms)
Output power
(both channel drive, a sine wave continuation output)
20Hz - 20kHz
65W+65W (4ohms)
50W+50W (8ohms)
THD (Main in->SP out) 0.05% or less (at the time of an Output power)
0.02% or less (at the time of 1W output)
Cross modulation distortion
(60Hz:7kHz=4:1, Main in->SP out)
0.05% or less (at the time of an Output power)
0.02% or less (at the time of 1W output)
Output bandwidth (IHF, both ch(es) drive) 5Hz - 50kHz
Transmission frequency response 5Hz-100kHz+0 Less than [ -1dB ]
Input sensitivity/impedance 1Vrms / 50kohm±10% (20Hz - 20kHz)
Signal to noise ratio (IHF, A network, input short-circuit) 116dB or more
Output load impedance 0.16ohm or less
Output terminal Speaker AorB: 4ohms - 16ohms
Speaker A+B: 8ohm-16ohm
Headphone jack
<Preamplifier part>
Input sensitivity/impedance Phono: 2.5Vrms/50kohm
Tuner, Aux, Tape1, 2:150mVrms/85kohm
Phono maximum permissible input (Phono->Rec out) 230 or more (1kHz) mVrms
THD (1kHz) Phono->Rec out: Less than 0.008% (at the time of 3Vrms output)
0.1% or less (at the time of the maximum except take-off)
Aux->Pre out: Less than 0.008% (at the time of an Output power)
RIAA deflection 20Hz-20kHz±0.2dB
An Output voltage/impedance Pre out(more than load 50kohm): 1Vrms (rating), 10Vrms (maximum)
Rec out: More than 150mVrms/50kohm
Frequency response 5Hz-100kHz+0 -1dB (at the time of Tone defeat)
Tone control Bass: 50Hz±10dB
Treble: 20kHz±10dB
Filter characteristic Low: 20Hz, 6 dB/oct
Muting - 10, -20dB
<PCC section>
Maximum permissible input 14Vrms
After-cancellation phone cross talk Abbreviation-40dB
Transmission frequency response 5Hz-100kHz+0 -1 dB
<Synthesis>
Transmission frequency response (at the time of Tone defeat) Phono->SP out: 20Hz-20kHz±0.3dB
Aux->SP out: 5Hz-100kHz+0 -3dB
Signal to noise ratio (IHF, A network, an input short circuit) Phono: 76dB or more
Tuner, Aux, Tape1, 2:100dB or more
Cross talk (Phono->SP out) - 75dB or less (20Hz - 1kHz)
- 60dB or less (20kHz)
Power receptacle switched: Two lines, a total of 250W
unswitched: One line, 100W
Power source AC100V, 50Hz/60Hz
Power consumption
(Electrical Appliance and Material Control Law)
125W
Dimensions Width 430x height 147x depth of 310mm
Weight About 13kg
Attachment The record for adjustment