The difference betwin the A-757 and the A-757 MKII is very minor.
first version of A-757 had different knobs for speaker/bass/treble/balance/phone selector controls
i prefere the round knobs used for the MKII :yes:
The A-757 MKII went into production in 1990
Im not sure about the stop "date" ..i believe it was in 92/93 :scratch2:
my own 757 MKII
http://audiokarma.org/forums/attachment.php?attachmentid=32911&stc=1
The complete specs
A-757 MKII
Continuous power output (both channels driven at 20Hz to 20KHz)**
T.H.D 0.003%, 8Ohm .......................... 95W + 95W*
T.H.D 0.005%, 4Ohm ....................... 140W + 140W*
DIN continuous power output (both channels driven)
1KHz, T.H.D. 1.0%, 8Ohm .................. 100W + 100W
1KHz, T.H.D. 1.0%, 4Ohm .................. 150W + 150W
Power bandwidth
0.05%, 8Ohm .................................. 5Hz to 70KHz*
Damping factor
(1KHz/20Hz to 20KHz), 8Ohm ...................... 200/70*
Dynamic power output (on EIA dynamic test signal)
4Ohm/2Ohm ........................................ 200W/300W***
Total harmonic distortion **
20Hz to 20KHz, 95W, 8Ohm ........................ 0.003%*
20Hz to 20KHz, 140W, 4Ohm ....................... 0.005%*
Inter-modulation distortion (at rated output) .. 0.003%*
Input sensitivity/impedance
PHONO (MM) ...................................... 2.5mV/50KOhm
PHONO (MC) ....................................... 0.2mV/100Ohm
CD, TUNER, LINE, TAPE ......................... 150mV/50KOhm
PHONO overload level
1KHz, T.H.D. 0.008% (MM/MC) ................... 200mV/19mV
Output level/impedance
TAPE REC, ADAPTOR OUTPUT ................. 150mV/2.2KOhm
Frequency response
PHONO (MM) 20Hz to 20KHz .............................. +-0.2dB
PHONO (MC) 20Hz to 20KHz .............................. +-0.3dB
CD, TUNER, LINE, TAPE (1Hz to 150KHz) .......... +0dB/-3dB
Tone control (volume control set at -40dB position)
BASS ...........................................................+-8dB (100Hz)
TREBLE ........................................................+-8dB (10KHz)
Loudness contour (volume control set at -40dB position)
........................................ +5dB (100Hz)/+3dB(10KHz)
Filter (SUBSONIC) ...................................... 17Hz (12dB/oct.)
Signal-to-Noise ratio (IHF short circuit, A network)
PHONO (MM, 5mV input/MC 0.5mV input) ................ 98dB/77dB*
CD, TUNER, LINE, TAPE .............................................. 110dB*
Signal-to-Noise ratio (DIN, continuous power/50mW)
PHONO (MM, 5mV input/MC 0.5mV input) ................ 74dB/65dB*
CD, TUNER, LINE, TAPE ........................................ 92dB/68dB*
Power Supply/Miscellaneous****
Power requirements .......................... a.c. 220 Volts ~, 50/60 Hz
Power consumption ...................................................... 820 W
Dimensions ............................ 420 (W) x 435 (D) x x 162 (H) mm
Weight (without package) ................................. 19.5 kg (43 lbs)
* Measured with the DIRECT switch set to ON.
** Measured by Audio Spectrum Analyzer.
My comments
*** Approx. 17Amps peak in 2Ohm :thmbsp:
**** 110 Volt setting is present in my sample
