The original PMA-850 had no rec-out option or Class A mode, but the PMA-850II has everything (except the muting switch which is replaced by the Class A / B function), has better specifications and is, predictably, the rare beast.
The PMA-850/II has been further refined in terms of materials and speed, based on a symmetrical push-pull circuit in all stages, making it an ideal ‘Class A’ principle for HIFI, an EBT output transistor has also been installed to achieve ‘100W + 100W’ Class B power, a spacious design, it’s an imposing and heavy device, a real monster.
It has 3 phono inputs, 2x MM and 1x MC, works in Class A or B mode, A-22w and B-100w.
It has a truly fantastic sound!
A very rare device!
Rated output (both channels drive, 20Hz to 20kHz, 0.01%) Class A operation – 22W + 22W (8Ω)
Class B operation – 100W + 100W (8Ω)
Output bandwidth (IHF, 8Ω) Class A: 5Hz-100kHz (THD 0.02%)
Class B: 5Hz-100kHz (THD 0.05%)
Input Sensitivity / Impedance Phono MM: 2.5mV / 50kΩ
Phono MC: 0.37mV (Rs = 40Ω)
Tuner: 320mV / 40kΩ
Main in: 1V / 50kΩ
SN ratio / allowable input Phono MM: 90dB / 200mV
Phono MC: 74dB / 30mV (Rs = 40Ω)
Tuner: 105dB
Main in: 122dB / 1V
Total harmonic distortion MM-Rec out: 0.01% (at output 25V)
Tuner-Pre out: 0.003% (at output 3V)
Frequency characteristics RIAA deviation: 20Hz-20kHz ± 0.2dB
Tuner-Pre out: 5Hz-100kHz +0 -1dB
Main-SP: DC ~ 100kHz +0 -1dB (0.5W, 8Ω)
Tone control Bass: ± 8dB (100Hz)
Treble: ± 8dB (10kHz)
Filter characteristics Subsonic filter: 20Hz, 12dB / oct
High cut filter: 7kHz, 6dB / oct
Weight 18kg