Teac A 70 Service Manual

Page 2

A-70/A-50 I

Type

1 SPECIFICATIONS

Dc Integrated Stereo Amplifier

Rated Output Power

50 W + 50 W (A-50: 30 W + 30 W),
Both Channels, 8 ohms 30 Hz - 20 kHz,
0.05% (A-50: 0.06%) T.H.D.

Total Harmonic Distortion

1 kHz, at Rated Output Power, 0.005%
(A-50: 0.01%)

Output Bandwidth

IHF,-3 dB, 10 Hz-50 kHz

Frequency Response

Tuner/Aux/Tape 1, 2 to SP out

10 Hz - 55 kHz+0, -2 dB

Phono to Rec Out, 20 Hz - 20 kHz: 0.5 dB
(RlAA)

Input Sensitivity

Phono MC 200 uV/IOD ohms (A-7O only)
Phono MM 2.5 mV/47 k ohms
TunarlAux/Tape 1, Z 150 mV/33 k ohms

Rated Output Voltage/Impedance

Tape Rec 1, 2 150 mV/33 k ohms

Signal-toNuise Ratio (IH F A Network)

Phone MC 66 dB (A-70 only)
Phono MM 82 dB
Tuner/Aux/Tape 1, 2 96 dB

Damping Factor 30

Tone Control
Bass 110dB,100 HZ
Treble iIOdB, 10 kHz
High Filter 10 kHz, 6 dB/oct
Suhsonic Filter 15 Hz, 6 dB/oct
Muting 20 dB

Weight

Power Requirements

IUD/120/220I240 V AC 50/80 HZ,
32 W (A-50: 52 W) (General Export Model)
120 V AC 60 Hz, 98 W (A-50: 60 W)

(U.S.A. Model)

120 V AC 60 HZ, 1.7 A (A-SO: 1.4 A)
(Canada Model)

220 V AC 50 HZ, 270W (A-EO: ISO WI
(Europe Model)

240 V AC 50 Hz, 350W (A-50: 190W)
(U.K./Aus. Model)

Dimensions (W x H x D)

432 x 72 x 296 mm (17" X 243/15" X 11-5/8")
7 kg (154/16 lbs) net

almprovements may result in specification or feature changes

without notice.

- Photos may differ slightly from production models.

NOTES

1. In this manual, 0 dB is referenced to 1 V.

2. A Parts marked with this sign are safety critical components.
They must always be replaced with identical components -
refer to the appropriate parts list and ensure exact replace<
ments.

3. PC boards shown are viewed from foil side.

2 VOLTAGE CONVERSION

(FOR GENERAL EXPORT MODELS)

BE SURE TO REMOVE THE POWER CORD FROM THE AC
OUTLET BEFORE REMOVING THE METAL COVER AND FIE-
POSITIONING THE VOLTAGE CONVERSION PLUG.

1.

2.
. Remove the plug by pulling it out, then re-insert it so that the

Remove the metal housing covering the top and sides of the unit
by removing the screws from each side of the metal cover.
Locate the voltage selector plug on the left side of the unit.

arrow on the plug is aligned with the white line indicating the
proper voltage.

. Replace the cover.

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«Resistor values are. in ohms: (k;kiloohms,

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6. ---2lrtB powemppply

9. EII Front naneiindiaation L
10. L- __ : Rear paneiindication , ,

.- m3 powersupply
8. WW 3 Audio signal path (show for L (