Arcam Explore the Features and Specifications of the A85 Phono Stage

Page 21

1

 

 

2

3

 

 

 

4

 

 

 

5

 

 

 

6

 

 

 

7

 

 

8

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Q_102

 

+15V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+ C102

 

C104

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

100U SILMIC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

100N PE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

D

 

 

 

 

 

C119

 

 

 

 

0V_HF

0V_SIG

 

 

 

 

 

 

 

D

 

 

 

R100

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R101

 

R102

 

 

 

 

 

 

 

 

 

 

 

 

 

330R MF

 

100P PP

 

 

 

 

100R MF

 

100R MF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C101

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TR100

 

 

 

 

 

 

 

TR102

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BC556B

 

 

1N0 PP

 

 

 

 

TR103

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BC556B

 

BC556B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TR101

 

C110

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+ C100

BC556B

 

4N7 PP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

22U EL

 

 

C120

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R109

 

 

1N0 PP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

12K MF

 

 

C112

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10N PP AX

 

 

 

 

 

TR108

 

 

TR109

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BC546B

 

 

BC546B

 

 

 

 

 

 

 

 

 

 

 

 

C111

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R110

 

 

 

R115

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

15K MF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

12K MF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10N PP AX

 

 

 

 

 

 

 

 

R118

 

 

 

 

 

 

 

 

 

 

LEFT IN

 

 

 

R112

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

22R MF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

D100

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

100K MF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SW100B

 

 

 

 

 

 

 

 

 

1N4148

C106

 

 

 

 

 

 

 

 

C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C

4PCO

 

C115

 

C105

 

 

 

 

 

 

 

100N PE

 

C113

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

100N PE

 

 

R116

 

 

 

 

 

 

 

 

LEFT OUT

 

 

 

 

 

 

 

1N3 PP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1U0 PE

 

 

 

 

 

 

6

5

4

 

 

 

 

 

 

2M2 MF

 

 

 

 

R119

 

 

 

 

 

 

 

 

TR106

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TR107

 

 

 

 

7

IC100

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R117

 

 

22R MF

 

 

R122

 

 

 

 

 

 

 

2SA1085

2SA1085

 

R111

Q_101

 

 

3

C118

 

 

 

 

 

39K MF

 

 

 

 

 

 

 

 

 

 

6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2M2 MF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

56K MF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10U NP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TL071CD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R124

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R108

SW100D

 

5K6 MF

R113

 

 

 

 

 

TR104

 

 

TR105

0V_SIG

 

 

 

 

 

 

 

4PCO

 

 

100K MF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

47K MF

 

 

 

 

 

 

 

BC556B

 

 

BC556B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R104

 

 

C109

10

11

12

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

100R MF

 

C108

100P PPW

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R114

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

470P PPW

R105

 

R123

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

100R MF

 

10R MF

100K MF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C116

 

 

 

C117

 

 

 

 

 

 

 

 

0V_SIG

 

 

 

0V_SIG

 

 

 

 

 

 

 

 

470P PPW

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

470P PPW

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TR112

TR113

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BC546B

BC546B

 

 

 

 

 

 

 

 

 

 

B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B

 

 

 

TR110

TR111

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BC546B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BC546B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TR114

 

 

 

 

 

 

 

 

 

 

 

 

 

D101

D102

 

 

 

 

 

 

 

 

BC546B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1N4148

1N4148

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R106

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

100R MF

 

 

 

 

 

 

 

 

 

 

 

 

 

R120

R121

 

 

 

 

 

 

+

C103

0V_SIG

C107

 

 

 

 

 

 

 

 

 

 

 

22R MF

22R MF

 

 

 

 

 

 

0V_HF

100N PE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

100U SILMIC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Q_103

-15V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A

 

 

 

 

 

 

 

 

DRAWING TITLE

 

 

 

 

 

 

 

 

 

 

 

A

 

 

 

 

 

 

 

 

A85 PHONO STAGE - LEFT CHANNEL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

23425

 

Circuit Diagram

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Notes:

 

 

 

01_1070

JAG

17/4/01

updated pcb and scm

 

2

 

 

 

 

 

 

 

 

 

A & R Cambridge Ltd.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Pembroke Avenue

 

 

 

 

00_1051

JAG

22/3/01

PRODUCTION ISSUE

 

1

 

 

 

 

 

 

 

 

 

Denny Industrial Centre

 

 

 

ECO No.

INITIALS

DATE

 

 

DESCRIPTION OF CHANGE

ISSUE

 

 

 

 

 

 

 

 

 

Waterbeach

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Filename

 

 

 

Date Printed

 

 

Drawn by:

 

 

 

 

 

 

 

 

 

 

 

 

 

Cambridge CB5 9PB

 

 

 

 

 

 

Sheet 2 of 3

DRAWING NO. 8L870C2

1

 

 

2

3

 

 

 

4

G:\DATA\ECO\ECO5

AGENDA\01_1070 l870 A85 PHONO ISSUE2\L870_2.0.ddb6- L870C2_2.0.SCH 23-Apr-2001

 

JBR

7

Image 21
Contents A85 Contents List Pre-amplifier circuit description Amplifier & PSU Circuit Description L882 Circuit Sheet PSU Ground naming convention is as follows A85, P85, P85/3 Service Guide Fault Diagnostics A85 amplifier and PSU top sheet Circuit Diagram A85 amplifier power supply and microcontroller interface A85 amplifier power output stage left A85 amplifier power output stage right DVD Display PCB USE Exclude NF When Using Runout Sheet Program Integrated amplifier preamp main signal path Integrated amplifier preamp power supply A85 Display PCB Circuit Diagram A85 Phono Stage TOP Level A85 Phono Stage Left Channel A85 Phono Stage Right Channel AP85 third channel top level 23425 P85 microcontroller and switch Page Page Page Page Page Page Page Arcam 220NF Class X2 CAP 275VRMS IC Vreg POS Wima FKP2 Ppro Obsolete, absent, redundant, or incorrect issue in PDM Part Qty Iss Description Designators Phono SKT 4-WAY EMC Gold SK2 SK3 SK4 SK5 WAF MN12818A VFD Itron DISP1 Title A85 Phono PCB Title RES SM Phono SKT 2-WAY EMC Gold Title P85 Switch Board Tact Switch 2-PIN LOW Prof SW1 SW2 A85 General Assembly Parts List Silver Black Description Where Used QTY P85 General Assembly A85P Transformer P85/3 General Assembly Clamp E912MC to E804HK ST=L
Related manuals
Manual 14 pages 30.61 Kb

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.