Mapletree Ear+ HD Super II Bedienungsanleitung

Ear+ Purist HD

Ear+ HD Super II

High Definition Stereo Headphone Amplifier

Users' Manual

Rev Feb. 25/13

Mapletree Audio Design

Lloyd Peppard

R. R. 1, Seeley's Bay, Ontario, Canada, K0H 2N0

(613) 387-3830

www.mapletreeaudio.com

info@mapletreeaudio.com

Introduction _

The Mapletree Audio Design Ear+ HD Super II Stereo Headphone Amplifier represents

a high performance development of the Ear+ family. The use of a high capacity power

supply provides increased power output and lower driving impedance employing widely

available EL84 output tubes and 12AX7/5751 drivers. The separate power supply chassis

allows flexibility in positioning each unit and reduces the heat seen by components in the

main amplifier chassis. Premium components include Tantalum film resistors in the

SRPP driver stage and an Alps volume control.

Input/Output Connections______

The standard IEC line cord is attached to the receptacle on the rear panel of the Ear+ HD

Super II power supply. It is compatible with a 115-125 VAC line with a frequency of 50–

60 Hz. The third pin is connected to the power supply chassis. A 1A/250 V fuse provides

primary protection for the power supply. It is located under the chassis and can be

accessed by removing the bottom cover of the power supply with the unit unplugged and

waiting 1 minute after powering off. Under normal conditions, it should not be necessary

to replace the fuse. If power fails to come on, you can check the fuse and replace with a

spare if necessary. If the fuse blows a second time, you should not try to operate the unit.

Contact Mapletree Audio Design for information regarding service.

The power supply is connected to the amplifier chassis with the supplied power

interconnect cord. Never power on the power supply without making this connection. The

two chassis may be stacked or separated as permitted by the power interconnect cord.

The power switch is located on the front panel of the power supply. The LED pilot light

indicates the power on condition. It is powered by the heater supply voltage so is an

indication that power is being supplied to the tube filaments. It takes about 30 seconds for

the tubes to reach operating temperature ready for use.

The RCA input jacks (IN 1–IN 2) are wired in parallel to permit patching the source

signal to a preamp or integrated amp without the need for Y-adaptors. Left channel jacks

are at the top. The input impedance is 50 k?.

The headphone output jacks are standard ¼" stereo phones jacks with the left channel

connected to the tip contact. If your headphones are terminated in a 1/8" plug, an adaptor

is required (usually supplied with your headphones). Headphone impedances from 30 to

300 ?are suitable for use with either the high impedance (Hi Z) or low impedance (Lo

Z) output jacks. The low impedance output provides a slightly reduced gain for low

impedance phones such as the Grado Prestige series, which may be desirable depending

on your preferred listening levels. Any impedance headphones can be used in either jack

without sonic penalty. The enhanced power output of the HD Super II permits two sets of

headphones to be driven at the same time.

Tubes____

EL84

(L)

12AX7

(R)

12AX7

(L)

EL84

(R)

Tube socket locations are shown above. When inserting tubes, take care to align the pins

before pushing firmly into the socket. Removal is easier if a slight rocking motion is used

at the same time as the tube is pulled from the socket.

A tube burn-in period of several hours may be needed to achieve the best sonic

performance. Tube life should be thousands of hours. Aging tubes may result in a

reduced gain in one or both channels or an increase in noise levels. Infrequently, a heater

may burn out which is indicated by total loss of sound. The Ear+ HD Super II is supplied

with 2 –5751/12AX7 (driver), 2 –EL84/6BQ5 (output) tubes. Matched pairs are not

required. Replacement tubes can be obtained from several suppliers in the U. S. and

Canada. Both types are currently manufactured and are also available as new old stock

(NOS). Some listeners enjoy trying different brands and variants of tubes. The greatest

sonic variation will occur with different driver tubes. Any 12AX7 equivalent (e.g. 7025A

or ECC83) may be used as long as the heater current does not exceed 0.3 A at 6.3 VAC.

Consult a substitution guide or tube manual.

Warranty___

Factory assembled MAD components are warranted for 2 years to the original purchaser for failure of all parts (excluding tubes).

Tubes are warranted for 90 days exclusive of shipping cost. Service, including parts and labor (but excluding shipping), is free within

the warranty period.

MAD Ear+ HD Super II Specifications______

Frequency response at 1 V rms (20 mW) output into 50 Ohms:

-20

-15

-10

-5

10 100 1000 10000 100000

Frequency (Hz)

Maximum undistorted output at 1 kHz: 4 V rms with 50 Ohm load connected to Hi Z output (= 0.32 W).

Po(max) Rload

680 mW 25 ?

500 mW 32 ?

160 mW 100 ?

57 mW 300 ?

28 mW 600 ?

Overload characteristic (1 kHz, 50 Ohm load, Hi Z output)

Output impedance at 1 kHz: Hi Z: < 2.6 ??, Lo Z: < 1.3 ??

Input impedance: 50 k? ?

Gain: Hi Z: 11 dB, Lo Z : 8 dB

Hum and noise at output (max volume, Hi Z): less than 0.4 mV rms (80 dB below max. output)

Recommended load impedance: 20–600 ?

Phase: non-inverting

Power consumption: 65 W, 120 VAC 50-60 Hz

out

= 4 V rms

out

= 5 V rms

out

2 V rms

Tant

3.9K

10W

50K

Alps

33u/160V

600:8

Volume 2

Chassis

EL84

Mapletree Audio Design

Ear+ HD Super II Headphone Amplifier

Hammond 119DA

Rev. Feb. 24/13

IN L

Tant

12AX7/5751

Tant

3.9K

10W

50K

33u/160V

600:8

EL84

Hammond 119DA

Tant.

12AX7/5751

Headphones

Hi Z

Headphones

Lo Z

120 VAC 100u/400V

33K

1 W 5% CF

100u/400V

Power

1 A/250 V

LED

Pilot

12AX7

EL84

100u/400V

EL84

1K 4

6 A

6.3 VAC

3.2 A

10000u/25V

12AX7

MUR180

Power Supply

120VAC

28VAC

110mA

Ground bus

1K/10W

+ +

IN R

Power in

Power out

+307 V +235 V

+235 V

+307 V

+127 V

+1.12 V

+120 V

+370 V

Chassis

+6.4 V

200

220K

10K

1% MF

10K

1% MF

Ground bus

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