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Hafler 9303 manual

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Table of contents for the manual

  • Page 1

    ® MADE USA IN THE PROFESSIONAL POWER AMPLIFIER 9303 / 9505 Installation & Operation PROFESSIONAL POWER AMPL nova trans ®[...]

  • Page 2

    NOTICE - IMPORTANT SAFETY INFORMATION CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN ! ! W ARNING: T O PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. 1. READ INSTRUCTIONS All the safety and operating instructions of your Hafler equipment should be read before power is applied to the equipment. 2. RETAIN OWNER'S MAN[...]

  • Page 3

    P ERFORMANCE S PECIFICATIONS 9303/9505 Full Power Bandwidth: 0.15Hz to 300kHz Signal-to-Noise: >100dB “A” Weighted Slew Rate: 150 V/ µ s CMRR: 75dB at 1kHz Gain: +29dB max. 9303 Power Rating: 150 wpc @8 Ω , 225 wpc @ 4 Ω , 450 Watts mono @ 8 Ω Distortion: 0.07% THD 20-20Hz, Typically 0.005% THD 1kHz, at rated power into 8 Ω Damping [...]

  • Page 4

    T ABLE OF C ONTENTS SAFETY PRECAUTIONS ........................................................................................................................................... i PERFORMANCE SPECIFICATIONS ......................................................................................................................... ii INTRODUCTION ....[...]

  • Page 5

    I NTRODUCTION – 1 – The Hafler 9303 and 9505 are two channel professional power amplifiers. Passive cooling with large heatsinks is used for low mechanical noise. Our patented trans• nova circuit topology and MOSFET output stage ensures trouble free, long term operation and is backed by our seven year warranty. This manual contains informatio[...]

  • Page 6

    – 2 – INPUT The 9303 and 9505 have input jacks for both balanced and unbalanced input signals. The unbalanced inputs use conventional RCA phono jacks. When using the RCA inputs, the rear panel BALANCED/UNBALANCED switch must be set to the UNBALANCED position. The balanced input jacks are dual function connectors which accept 1/4" TRS (Rip [...]

  • Page 7

    – 3 – O PERATION POWER SWITCH The POWER switch is located on the front panel of the amplifier. An internal lamp indicates when it is turned on. Standard practice is to turn the amplifier on last and off first when switching components individually to prevent sending damaging transients, generated in the source components, to the speakers. It is[...]

  • Page 8

    – 4 – S CHEMATIC D IAGRAM NOTES: Unless specified otherwise 1. All resistors in ohms 2. All capacitors in microfarads 3. Component Designators: 1-99: Left Channel 101-199: Right Channel 201-299: Common Parts 301-399: Chassis/Power Supply 4. Left Channel Only Shown 5. Stereo/Mono Switch Shown in Stereo 6. Balanced/Unbalanced Switch Shown in Bala[...]

  • Page 9

    – 5 –[...]

  • Page 10

    – 6 – PC B OARD L AYOUT[...]

  • Page 11

    – 7 – P ARTS L IST DESIGNATOR VALUE PART # R213 220, 1/4W, 5% RM/4-221C R214 220, 1/4W, 5% RM/4-221C R215 10k, 1/4W, 5% RM/4-103C P1, P101 200, Trim Pot RVH-201 P2, P202 200 Trim Pot RVH-201 D1, D101 BAV99L SS-260SM D2, D102 BAV99L SS-260SM D3, D103 BAV99L SS-260SM D4, D104 BAV99L SS-260SM D5, D105 BAV99L SS-260SM D6, D106 BAV99L SS-260SM D7, D[...]

  • Page 12

    – 8 – 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 SS[...]

  • Page 13

    T ECHNICAL R EFERENCE THEORY AND OPERATION OF trans• nova The ( TRANSconductance NOdal Voltage Amplifier) principle is based on our 1984 U.S. Patent 4,467,288. This patent describes the advantages of audio power amplifiers in which a MOSFET output stage is connected in a grounded source configuration. In this connection the output stage has its f[...]

  • Page 14

    – 10 – The final output stage utilizes lateral MOSFETs; four pairs are used for each channel in the 9505 and three pairs in the 9303. These devices, unlike conventional bipolar transistors do not exhibit “ thermal runaway. ” Thermal runaway is a phenomenon whereby a transistor heats up as it draws more current, which causes it to get hotter[...]

  • Page 15

    S ERVICE P OLICY AND L IMITED W ARRANTY If you encounter any difficulty or have any question concerning your 9303 and 9505 Amplifier, please call our Technical Support Department weekdays, 8:00 a.m. to 3:30 p.m., Mountain Standard Time, at 800-795-2385. Should you have any doubts as to whether the amplifier is malfunctioning and requires service, p[...]

  • Page 16

    MAN-0587-D 4/95  HAFLER PROFESSIONAL A DIVISION OF ROCKFORD CORPROATION 546 SOUTH ROCKFORD DRIVE TEMPE, ARIZONA 85281 U.S.A. IN U.S.A. (602) 967-3565 IN EUROPE, FAX (49) 4207-801250 IN JAPAN, FAX (81) 559-79-01265[...]