Denon PMA-850

Solid State Stereo Integrated Amplifier

A new series of Denon amplifiers, incorporating a wide dynamic range, low noise MC amplifier. It reaches the highest class in the most fundamental characteristic of amplifiers both in distortion factor and Signal-to-Noise  separation. By coupling all stages with a pure complementary circuit from MC amplifier to power amplifier using both PNP, NPN transistors, an ultra low distortion rate of 85 W +85 W was achieved.

Features:

An DC power amplifier placing importance on a quick build-up characteristic by incorporating, a new amplifying element. Distortion factor less than 0,01% (20 Hz - 20 kHz).

Torodial core power transformer which has an independent coil for left and right channels for exceptional regulation.

Employment of an ultra low noise transistor permits a high Signal-to-Noise  ratio, head amplifier for MC type cartridge (74 dn IHF-A), and equalizer amplifier (89 dB IHF-A)

Provided with direct couple switch for direct connection of equalizer amplifier and power amplifier

A unique design of two tone color, imparting a sense of high class structural grace.

Specifications:

Type Amplifier:  All stage pure complementary pushpull system DC circuit

Power Amp Section

Rated Output (Both channel driven):

110 W RMS (at each channel) : 1 kHz (T.H.D. 0,05%, 4 Ω)

85 W RMS (at each channel) :  20 Hz to 20 kHz (T.H.D. 0,01%, 8 Ω)

Total Harmonic Distortion (at rated output, 20 Hz to 20 kHz):  less than 0,01%

Intermodulation Distortion (60 Hz : 7 kHz = 4 : 1)a rated output:  less than 0,02%

Power Bandwidth (both channels driven, 8 Ω):  5 Hz to 100 kHz

Transmission Characteristic:  DC to 100 kHz +0 dB, -1 dB (at 1 watta output)

Frequency Response (at 0,5 W output, -1 dB):  5 Hz - 100 kHz +0 dB -1 dB

Input Sensitivity/Impedance (20 Hz - 20 kHz):  1 V RMS/50 k Ω  ±10 %

Output Impedance:  less than 0,16 Ω

Signal-to-Noise  Ratio (IHF, A network at input terminal Shorted):  122 dB

Output Terminals:

Speaker :  A & B = 4 - 16 Ω load; A + B = 8 - 16 Ω load

Headphone :  for stereo headphone

Pre Amplifier Section

Pre Amp Output:

Max. Output :  25 V at 50 k Ω

Rated Output :  1 V

T.H.D. :  0,003% at 3 V output

Equalizer Amp Output:

Max. Output :  25 V at 50 k Ω load (T.H.D. 0,01%)

Rated Output :  320 mV

Input Sensitivity/Impedancce

Phono MM 1, 2  :  2,5 mV RMS/ 50 k Ω

Phono MC 3 :  0,37 mV (cartridge impedance 40 Ω)

Tuner :  320 mV / 40 k Ω

Aux, Tape :  320 mV / 40 k Ω

RIAA Deviation (20 Hz to 20 kHz):  ±0,2 dB

Signal-to-Noise Ratio (IHF, A network)

Maximum Allowable Input Phono:  200 mV RMS (1 kHz)

Phono MM :  better than 89 dB (input terminal shorted)

Phono MC :  better than 74 dB (input terminal 40 Ω)

Tuner, Aux, Tape :  better than 105 dB (input terminal shorted)

Aux to pre Out Frequency Response Tone Defeat:  5 Hz to 100 kHz +0 dB, -1 db

Tone Control Frequency Response:

Bass :  100 Hz ±8 dB

Treble :  10 kHz ±8 dB

Filter Characteristic:

Subsonic  :  20 Hz  at 12 dB/oct

High Cut :  9 kHz at 12 dB/oct

Loudness Control Characteristic:

Low Range :  100 Hz +7 dB

High Range :  10 kHz +6 dB

Muting level:  -20 dB

Power Source:  AC 120 V 60 Hz, AC 220/240 V 50/60 Hz

Dimensions (W x H x D):  434 x 164 x 400 mm (17-5/64" x 6-29/64" x 15-3/4")

Weigh:  17 kg (37,5 lbs)