Acoustic research p 10 service manual

Page 1

ELECTRONICS
m SEW
MANUAL

P46)

POWER AMPLIFIER

NTELEDYNE
ACOUSTIC RESEARCH

Turnpike Street, Canton,
Mass. 02021, USA.

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SPECIFICATION

Rated power output (20Hz-20KH2 8 OHM):

Dynamic power at 8 OHM/4 OHM/2 OHM:
(I.H.F. Standard 20ms Duration)

Clipping power at 8 OHM/4 OHM/2 OHM:

Dynamic Headroom at 8 OHM/4 OHM/2 OHM:

T.H.D. at Rated power:
I.M.D. at Rated power:
Damping Factor:
Frequency Response 20-20KHz:
POWER Band width at T.H.D. 0.1%:
Input Resistance/Capactance:
Input Sensitivity:
Channel Crosstalk (l KHz):
S/N Ratio (A-weighted):
Dimensions W x H x D (inch):
(cm):
Net weight:

POWER supply
0.8. and Canadian Models:

European model:

Other Area Model:

ALIGNMENT

IDLE CURRENT ALIGNMENT

bwwb-l

. Remove the load from speaker terminals.

. Push on power for 5 minutes pre-heating.

120w per channel

400W/800W/1200W
125W/175W/220W
6 dB

0.02%

0.02%

=>100

$0.2 dB

10-40 KHz

40K OHM/lZOpF

IV
85 dB
120 dB

16.9" x 4.3" x 14.3"
43 x 11 x 36.5
15 Kg

120V/60 Hz
220V,24OV/50 Hz
llOV,220V/SO 82,60 Hz

. Turn VR603, VR604 to fully counter clockwise position.

. Connect DC millivolt-meter across R651 for left channel R652 for

Right channel. The meter sensitivity should be set at 100mV full

scale deflection.

5. Adjust VR603 (Left channel) and VR604 (Right channel) till the

reading from meter is between 2.5mV and SmV the alignment is completed.