Akai AM-2850 Preliminary Service Manual

PRELIMINARY SERVICE MANUAL
mopeL AM-2850/2950
DATE January, 1979
I. TECHNICAL DATA
1. Model AM-2850
POWER AMPLIFIER SECTION
Rated Output Power
2-Channels Driven
Frequency Response
Power Bandwidth (IHF)
Signal to Noise Ratio (IHF)
PHONO
AUX
Residual Noise
Channel Separation (IHF)
PHONO
Damping Factor
Output Speakers
Headphone
PRE AMPLIFIER SECTION
Input Sentivity/Impedance
PHONO
AUX
TUNER
TAPE MONITOR
MAIN IN
Output Level/Impedance
TAPE REC
PRE OUTPUT
Frequency Response
PHONO (RIAA equalization)
AUX, TAPE MONITOR
Tone Control
BASS
MID RANGE
TREBLE
Loudness Control
Filter HIGH
LOW
95 watts per channel, minimum RMS, at 4 ohms
from 20 to 20,000 Hz with no more than 0.08%
total harmonic distortion.
85 watts per channel, minimum RMS, at 8 ohms
from 20 to 20,000 Hz with no more than 0.08%
total harmonic distortion.
2 xX 140 watts into 8 ohms at 1 kHz, with no
more than 0.08% total harmonic distortion.
2 x 100 watts into 8 ohms at 1 kHz, with no
more than 0.08% total harmonic distortion.
Main in: DC to 100kHz +0dB, -0.5dB
10 Hz to 40 kHz/8 ohms
(Total Harmonic Distortion: 0.08%)
Better than 75 dB
Better than 95 dB
Less than 0.3 mV at 8 ohms
Better than 50 dB at 1kHz
More than 50 (1 kHz, 8 ohms)
A, B, C (4 to 16 ohms)/A+B, A+C, B+C (8 to 16 ohms)
4 to 16 ohms
PHONO 1: 3mV/33/47/100 kohms,
PHONO 2: 3mV/47 kohms
150 mV/100 kohms
150 mV/100 kohms
PIN: 150 mV/100 kohms,
DIN: 30 mV/100 kohms
PIN: 1V/47 kohms
PIN: 150 mV/1 kohms,
DIN: 150 mV/30 kohms
1V/47 kohms
30 Hz to 15 kHz +0 dB, -1 dB
3 Hz to 60 kHz +0 dB, -1 dB
+9 dB at 100 Hz
+10 dB at 1 kHz
+9 dB at 10 kHz
+10 dB at 100 Hz, +6 dB at 10 kHz
(Volume control set at -30 dB position)
-6 dB at 10 kHz
-6 dB at 30 Hz
AKAI ELECTRIC CoO., LTD.
(P.0.BOX 21, Tokyo Airport, Japan)
12-14, 2-chome, Higashi-Kojiya, Ohta-ku, Tokyo, Japan
Printed in Japan