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GENERAL Weight: Approx. 10.5 kg (23 lb 2oz). net
Approx. 12.5 kg (27 lb 9 oz), in shipping carton
Power Requirements: 120V ac, 60 Hz (US, Canadian Model) (US, Canadian Model)
220 V ac, 50160 Hz (AEP Model) Approx. 9.5 kg (21 lb), net
240 V ac, 50/60 Hz (UK Model) 11.5 kg (25Ib 6oz), in shipping carton
120 or 220V ac adjustable. 50/60 Hz (E Model) (AEP, UK, E Model)
Power Consumption: 85 W (US Model)
140W [Canadian Model) AMPLIFIER SECTION
210W (AEP, E Model)
240W (UK Model) Continuous RMS
Power output: Both channels driven simultaneously
Dimensions: Approx. 435 (w) x 145 (h) x 370 (d) mm (Less than 0.5% THD) At 1 kHz
17 1/8(w) x 53/4(h) x 14%ldl inches 5OW+5OW (8nl
(US, Canadian Model) At 20 Hz-20 kHz
Approx. 410 (w) x 145 (h) x 370 (d) mm 5OW+5OW(SI~l
161/4(w) x 5%(h) x 141/,ldl inches According to DIN 45500 (AEP, UK, E Model)
(AEP, UK, E Model) 52W+52W 03.Q)
Including projecting parts and controls
Power Bandwidth (IHF): 10 Hz-25 kHz
SAFETY-RELATED COMPONENT WARNING!! Damping Factor: 30
COMPONENTS IDENTIFIED BY SHADING AND A
Harmonic Distortion: Less than 0.5% at rated output
MARK ON THE SCHEMATIC DIAGRAMS, EXPLODED Less than 0.1 % at 1 W output
VIEWS AND IN THE PARTS LIST ARE CRITICAL TO
SAFE OPERATION. REPLACE THESE COMPONENTS IM Distortion: Less than 0.5 % at rated output
WITH SONY PARTS WHOSE PART NUMBERS APPEAR (60 Hz: 7 kHz = 4:1) Less than 0.1% at 1W output
A8 SHOWN IN THIS MANUAL OR IN SUPPLEMENTS
PUBLISHED BY SONY.
ATTENTION AU COMPOSANT AVANT RAPPORT
1-2. CIRCUIT DESCRIPTION 3. Muting Circuit (See Fig. 1-3 and Fig. 1-4)
This muting circuit prevents the loud "pop" (due
PROTECTION CIRCUIT to initial current flow) or click noises produced
just after turning the POWER switch to on or off.
Two kinds of protection circuit are employed in These transients might damage a delicate high-
this power amplifier. One is a power-transistor fidelity speaker system.
protection circuit and the other is a speaker pro-
tection circuit. . When POWER Switch turned on:
C308 commerces to charge through R309. At the
1. Power-transistor Protection Circuit same time, the base voltage of Q306 gradually
To protect overloaded power transistors from rises in accordance with charging voltage of C308.
destruction, a protection circuit is employed. The It takes about 3 seconds until Q306 is turned on.
fusible resistors are inserted in each of Q704, Accordingly, the speaker output terminal is cut off
4705 (L-CH) and 4754, 4755 (R-CH) collector by the relay RY301 for about 3 seconds after the
and emitter circuits. When the excessive current POWER switch is turned on. This protects the
flows into the power transistors, these fusible speaker from the destruction caused by the "pop"
resistors break faster than the transistors and thus noises.
protects the transistors from destruction.
Speaker Protection Circuit (See Fig. l-l and Fig. 1-2)
When the excessive current flows into the power
transistors, B+ voltage decreases. Therefore, 4301
turns on, biasing the base of Q302, and Q302
conducts. This removes the bias voltage at the
base of Q306 and Q306 turns off. The relay is
not activated by off state of Q306. According-
ly, the speaker is cut off from the amplifier
When the positive dc component presents at the
speaker output terminal, C310 is charged up as
shown in Fig. l-2. Q303 turns on, Q306 turns off
and the relay RY301 is not activated (4304 re- Fig. 1-2.
mains in off condition). Also, when the negative
dc component presents, C3 11 is charged up. This
turns 9304 on, Q306 off and RY301 is not . When POWER Switch turned off:
activated (9303 remains in off condition).
The reverse voltage (about - 1.7 V) that turns off
Q306 immediately reduces, and the positive poten-
tial is applied to the base of Q305. Q305 turns on
and Q306 turns off, cutting off the operation of
RY301. Therefore, no pop noise presents on the
POWER Switch :ON
Fig. l-1. Fig. 1-3.
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