DESIGNATOR

VALUE

PART #

Q8, Q108

MMBT5087L

SS-0115

Q10, Q110

MMBT5088L

SS-0114

Q11, Q111

MMBT5087L

SS-0115

Q12, Q112

MMBT5088L

SS-0114

Q13, Q113

MMBT5087L

SS-0115

Q14, Q114

MPS-A56

SS-101A

Q15, Q115

MPS-A56

SS-101A

Q16, Q116

MPS-A06

SS-102A

Q17, Q117

MPS-A06

SS-102A

Q45, Q145

2SK1058

SSH-741T

Q46 Q146

2SK1058

SSH-741T

Q47, Q147

2SK1058

SSH-741T

Q48, Q148

2SK1058

SSH-741T

Q49, Q149

2SJ162

SSH-740T

Q50, Q150

2SJ162

SSH-740T

Q51, Q151

2SJ162

SSH-740T

Q52, Q152

2SJ162

SSH-740T

Q201

MMBT5087L

SS-0115

Q202

MMBT5088L

SS-0114

Q203

MMBT5088L

SS-0114

F1, F101

AGC 10A Fuse

FS-010

F2, F102

AGC 10A Fuse

FS-010

F201

15A Slo/Blo

FS-015SB

F203, F204

2.5A Fast Mini

FS-0390

 

DESIGNATOR

VALUE

 

PART #

 

BR201

Bridge Rectifier

SS-222

 

BR301

Bridge Rectifier

SSH-609

 

BR-302

Bridge Rectifier

SSH-609

 

 

IEC Connector

CC-0918

 

 

IEC Line Cord

FA-0209

 

 

Dual Binding Post

CC-0867

 

 

MOSFET Insulator

HWH-442

 

 

 

 

 

 

 

9303 Differences

 

 

 

 

 

 

 

 

 

 

 

IEC Line Cord

FAH-146

 

 

C19, C119

15000

f, 75V

CER-159ES

 

 

C20, C120

15000

f, 75V

CER-159ES

 

 

F201

10A, Slo/Blo

FS-010SM

 

 

 

Not Used

 

 

 

Q47, Q147

2SK/1058

 

 

 

Q50, Q150

2SJ/162

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

9303 / 9505 FUNCTIONAL BLOCK DIAGRAM

(+)

LEFT INPUT (–)

BALANCED/

UNBALANCED

SWITCH

(+)

RIGHT INPUT

(–)

 

SERVO

 

 

INTEGRATOR

 

(+)

 

 

(+) BUFFER

 

 

 

LEFT CH.

LEFT

(–)

AMPLIFIER

OUTPUT

(–) BUFFER

 

 

 

SERVO

 

 

INTEGRATOR

 

(+)

 

 

(+) BUFFER

 

 

 

RIGHT CH.

RIGHT

(–)

AMPLIFIER

OUTPUT

 

 

(–) BUFFER

 

 

STEREO/MONO

 

 

SWITCH

 

 

RIGHT CH.

LEFT CH.

HIGH VOLTAGE

HIGH VOLTAGE

POWER

POWER

SUPPLY

SUPPLY

LOW VOLTAGE POWER SUPPLY

SOFT

TURN ON/OFF

SYSTEM

– 8 –

Page 12
Image 12
Hafler manual 9303 / 9505 Functional Block Diagram

9505, 9303 specifications

The Hafler 9303 and 9505 are both high-performance power amplifiers that have garnered a solid reputation among audiophiles and professionals in the audio industry. These amplifiers are designed to deliver high-quality sound reproduction with performance and reliability, making them suitable for various audio applications, from home theater systems to professional studio work.

The Hafler 9303 is a versatile amplifier known for its warm sound and consistent performance. With a power output of 100 watts per channel at 8 ohms and 150 watts at 4 ohms, it provides ample headroom for dynamic peaks in music without distortion. The 9303 features a classic, rugged design and is equipped with an exceptional thermal management system to prevent overheating during extended use. Its circuitry incorporates advanced feedback technology that minimizes distortion and enhances audio clarity. The amplifier also supports both balanced and unbalanced inputs, allowing for flexible integration into various audio systems.

On the other hand, the Hafler 9505 takes the performance up a notch with a powerful 200 watts per channel at 8 ohms, and it can reach 300 watts at 4 ohms. This model is ideal for driving larger speakers and can handle demanding audio setups. The 9505 incorporates Hafler's proprietary active feedback design, which maximizes damping factor and ensures accurate transient response. Its robust construction and high-quality components provide longevity and reliability, making it a favorite among professionals who require consistent performance in demanding environments.

Both amplifiers feature dual-mono construction, ensuring independent power supply for each channel, which helps in maintaining channel separation and reducing crosstalk. This design contributes to a wider soundstage and clearer audio reproduction, crucial for critical listening and professional applications. Furthermore, the amplifiers are equipped with comprehensive protection circuitry, safeguarding the components against speaker short circuits and thermal overloads.

In summary, the Hafler 9303 and 9505 power amplifiers represent an excellent choice for anyone seeking reliable and high-fidelity audio performance. With their impressive power outputs, advanced technologies, and robust designs, these amplifiers are versatile enough to cater to both home audio enthusiasts and professional sound engineers, ensuring that they deliver exceptional sonic experiences across various settings.