1

2

3

4

5

6

7

8

 

 

 

 

 

 

 

 

 

 

 

+5V_D

D

 

 

 

+5V_D

 

14

 

 

TH100

 

 

 

 

 

 

 

+ C102

PTH90DEG

 

IC100G

C100

C101

IC100E

74HC14D

100N SM

100U EL

100N SM

 

11

10

THERMPROT

7

R100

74HC14D

 

1K0 SM

 

IC100F

 

 

 

13

12

SK100

TP102

 

 

 

 

 

1

TP103

 

2

 

 

 

 

3

 

 

 

4

 

 

0V_D

5

SPKR1 ON

TP104

6

SPKR2 ON

 

TP105

 

7

THERMPROT

 

TP106

 

8

VIPROT1

 

TP107

 

9

DCPROT1

 

TP108

 

10

 

 

 

 

 

11

+5V_D

 

 

 

 

12

 

 

 

 

 

13

 

 

 

 

 

14

 

 

 

0V_SIG

R107

 

 

0V_D

 

FFC 14W 2.54MM VER

 

SP100

2R2 SM

PIN 1 TO THE LEFT AS YOU LOOK FROM THE FRONT

TP116

0V_D

 

 

 

 

 

0V_LS

STAR POINT 8 0V_HF

 

 

 

 

0V_PSU

 

D

C

B

A

0V_D74HC14D

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IC100A

IC100B

 

 

 

 

+49V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R101

 

 

1

 

23

 

4

 

VIPROT1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1K0 SM

 

C103

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

74HC14D

74HC14D

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10N SM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

D100

RLY101B

 

 

RLY100B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IC100C

IC100D

 

 

 

 

RLY SPST SPKR

 

 

RLY SPST SPKR

D101

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R102

 

 

 

 

 

 

 

 

 

 

 

1N4003F

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5

 

69

 

8

 

DCPROT1

 

 

 

 

 

 

 

1N4003F

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1K0 SM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C104

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

74HC14D

74HC14D

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10N SM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SK101

TP109

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

L911C2_1

 

 

 

 

 

 

 

 

 

 

 

 

 

TR100

TR101

 

 

R105

SPKR1 ON

 

 

 

 

F

 

L911C2_1.1.SCH

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

INPUT

VIPROT

 

 

 

 

 

 

 

 

 

 

 

 

BD179

BD179

 

 

100R SM

 

 

 

 

 

 

 

 

 

0V_D

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0V_SIG

DCPROT

TP111

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

EMC

 

 

 

 

 

SK102A

 

 

TP113 SK102B

 

 

 

 

 

 

 

 

 

 

 

 

N

+49V

0V_LS

OUTPUT

 

 

RLY101A

TP112

 

RLY100A

 

 

 

 

 

 

 

 

 

 

 

C105

0V_HF

 

 

 

 

 

 

 

Top+

 

 

Bot+

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R106

 

 

 

 

 

VPOS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SPKR2 ON

 

 

1N0 SM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

100R SM

 

 

 

 

PHONO2G

 

VNEG

 

 

 

RLY SPST SPKR

 

 

RLY SPST SPKR

 

 

 

 

 

 

 

 

 

 

 

 

-49V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R103

 

R104

 

 

 

 

0V_SIG

TP110

 

0V_HF

 

 

 

 

 

 

 

Top-

 

 

Bot-

 

 

 

220R SM

 

220R SM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0V_LS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0V_LS

 

 

 

 

 

 

0V_D

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+49V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TP100

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

BR100

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TP114

 

 

 

BRGBU8D

+ C106

 

 

PB

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+

 

C108

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10,000u 63V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

100N PC

 

 

PCB

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

~

 

~

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

L911PB_1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+ C107

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0V_PSU

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SK103

 

 

-

 

10,000u 63V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C109

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MOLEXPWR4

 

4

 

 

 

TP101

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

4

 

 

 

 

 

100N PC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DRAWING TITLE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TP115

 

 

 

 

 

POWER AMP SUPPLY

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AP85 third channel - top level

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

23425

 

 

Circuit Diagram

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

-49V

 

 

 

Notes:

 

 

01_1101

 

JR

4/6/01

 

DC OFFSET CHANGES

 

 

1.1

 

 

 

 

 

 

 

 

 

 

A & R Cambridge Ltd.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Pembroke Avenue

 

 

 

01_1018

 

JR

30/1/01

PRODUCTION ISSUE

 

 

1.0

 

 

 

 

 

 

 

 

 

 

Denny Industrial Centre

 

 

ECO No.

INITIALS

DATE

 

 

DESCRIPTION OF CHANGE

ISSUE

 

 

 

 

 

 

 

 

 

 

Waterbeach

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Filename

 

 

Date Printed

 

 

 

Drawn by:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cambridge CB5 9PB

 

 

 

 

 

 

Sheet 1 of 2

DRAWING NO. L911C1

 

 

 

 

 

 

 

 

 

 

 

J:\ECO_wip\01_1101 A85 RANGE PCB FUSES AND DC OFFSET\L911_1.1.DDB - Documents\L911C14-Jun-2001.1.PRJ

J Reckless

 

 

1

 

2

 

 

 

3

 

 

4

 

 

 

5

 

6

 

 

 

 

7

 

 

 

8

 

C

B

A

Page 23
Image 23
Arcam A85 service manual AP85 third channel top level

A85 specifications

The Arcam P85 and A85 amplifiers are a testament to Arcam's commitment to high-quality audio performance. These components are well-known in the audiophile community for their unique blend of state-of-the-art technology and superior sound quality, catering to discerning listeners who value fidelity and craftsmanship.

The Arcam A85 is a high-performance integrated amplifier that features a robust design and advanced circuitry. It offers a powerful 85 watts per channel output, which is more than sufficient to drive a wide range of speakers with clarity and precision. The A85 incorporates a dual mono design with separate power supplies for the left and right channels, ensuring low crosstalk and high channel separation. This design choice also enhances the amplifier’s dynamic response, allowing it to handle complex musical passages with ease.

One of the standout features of the A85 is its use of high-quality components, including low-noise transistors and capacitors that are specifically chosen to minimize distortion. The amplifier exhibits an impressive signal-to-noise ratio, contributing to a clean audio signal that preserves the nuances of the music.

On the other hand, the Arcam P85 is a powerful, dedicated power amplifier that pairs perfectly with the A85. It utilizes a Class G amplification technology, which provides significant power efficiency. This means that the P85 can deliver peak power output without generating excessive heat, making it an ideal choice for long listening sessions.

The P85 offers 85 watts per channel into 8 ohms but can also deliver 140 watts into 4 ohms, allowing it to drive even the most demanding loudspeakers with authority. Its balanced XLR inputs, alongside standard RCA inputs, ensure compatibility with various audio sources, while the sturdy construction ensures durability and performance.

Both the A85 and P85 feature a simple yet elegant design, characterized by a sleek chassis that minimizes resonances and maximizes aesthetic appeal. They also come equipped with a variety of connection options, including multiple line-level inputs and outputs, making integration into an existing audio system straightforward.

In summary, the Arcam P85 and A85 amplifiers represent a harmonious fusion of innovative technology, impeccable sound quality, and user-friendly design. Their powerful performance, combined with high efficiency and low distortion, makes them a prized possession for any audiophile seeking to enhance their listening experience. Whether used in a stereo setup or as part of a more extensive home theater system, the A85 and P85 deliver exceptional audio performance that stands the test of time.