What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.




H.H. Scott '59





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)

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