Hafler DH-500 Instructions For Assembly And Operation Manual
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Hafler DH-500 Instructions For Assembly And Operation Manual

Hafler amplifier user's guide dh-500
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See also: User Manual
THE
POWER AMPLI FIER
CAUTION:
IF THE FUSES BLOW,
SOME DISTORTED SOUND CAN BE
HEARD. THEREFORE IF AMPLIFIER
MALFUNCTIONS, ALWAYS CHECK
FOR BLOWN FUSES FIRST.
THE DAVID HAFLER COMPANY
5910 Crescent Boulevard, Pennsauken, New Jersey 08109
for ASSEMBLY
and OPERATION
LM153
$3.00
Please refer to this serial
number in all communications
regarding this equipment.

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Summary of Contents for Hafler DH-500

  • Page 1 IF THE FUSES BLOW, SOME DISTORTED SOUND CAN BE HEARD. THEREFORE IF AMPLIFIER MALFUNCTIONS, ALWAYS CHECK FOR BLOWN FUSES FIRST. THE DAVID HAFLER COMPANY 5910 Crescent Boulevard, Pennsauken, New Jersey 08109 for ASSEMBLY and OPERATION LM153 number in all communications $3.00...
  • Page 2 Power Rating: Less than 0.025% total harmonic distortion at any power level up to 255 watts continuous average power per channel into 8 ohms at any frequency between 20 Hz and 20 kHz with both channels driven. IM Distortion (SMPTE): Less than 0.007% from 1 watt to 255 watts into 8 ohms Typical THD at 255 watts into 8 ohms: Frequency Response into 8 ohms: -3 dB, 0.5 Hz to 120 kHz at 1 watt Typical Channel Separation at 1 kHz: 60 dB...

  • Page 3: Table Of Contents

    So rugged is the DH-500 that it can deliver over 20 amperes into a short circuit! For those with special power needs, the DH-500 can be...

  • Page 4: Installation

    The DH-500 may be installed out of sight in many appli- cations, where its power can be controlled by the AC switching of a preamplifier control unit. However, any high power amplifier may draw enormous amounts of cur- rent, so you should make...

  • Page 5: Connections

    If it is 1000 ohms or less, as with Hafler preamplifiers, cable lengths of up to 100 feet are permissible without loss of per- formance.

  • Page 6: Assembly Instructions

    3. Check your work carefully after each step. The DH-500 amplifier is a versatile component with sophisticated circuitry which has been made remarkably easy to build by individuals with many years ofexperience in the design and engineering of the finest performing audio kits, and in the preparation of their manuals.
  • Page 7 4. Allow the connection to cool undisturbed. Remember that the connection is made by the solder, not by mechanically attaching the wire to the terminal. Usually the wire is looped through the lug and crimped in place, but some prefer to just place it through the hole and rely on the stiffness of the wire to hold it while soldering.

  • Page 8: Mechanical Assembly

    MECHANICAL ASSEMBLY 1 0 For security in shipping, the power transformer and the amplifier module have been fastened to the chassis. Remove the chassis cover, the inner front panel and the larger front plate, and set these aside. Be particularly careful in handling the amplifier module.
  • Page 9 S e l e c t the plastic encased relay, the longer L-shaped mounting bracket, and 2 sets of hard- ware. Insert the screws through the bracket with the bracket foot pointing away from the lugs at the opposite end of the relay. ‘ lighten this hardware se- curely, but do not risk breaking the plastic.
  • Page 10 connections which pass substantial current, the heavier wire is used. Other connections need only the lighter gauge wire. Connect the wires to the bottom of the module from the right side, 23 0 Prepare a 9-1/2“r ed wire and connect one end to TS2 lug #6.

  • Page 11: Chassis Wiring

    40 0 Prepare two 9” white wires. Connect one to eyelet #8 of the left board. (S). Connect the other to eyelet #6. (S). Bend these toward the bottom, and twist them together. 41 0 Prepare a 3” white wire and connect it to eyelet #3. (S).
  • Page 12 62 0 Prepare a 3” white wire. Connect one end to RY lug #4. (S). Connect the other end to red output termi- nal LR. (S). 63 [7 Prepare another 3” white wire. Connect one end to RY lug #6. (S). Connect the other end to output terminal RR.
  • Page 13 80 0 Select the triad of black, red and yellow wires from under the module. These will be connected to the right end of the terminal strip, and to prevent the heat from the large resistors from melting the insu- lation on the wires, connect the wires from behind the terminal strip and keep them against the chas- sis, so the resistors will be above them.

  • Page 14: If Problems Arise

    97 0 mfd disc capacitor and trim each lead Select the .Ol to 3/4". Strip two 1/2" lengths of insulation from a piece of heavy wire, and install these on the capacitor leads. Connect one lead to DB lug #l. (S-3).

  • Page 15: Circuit Description

    MOSFETs. The driver and output stages of the DH-500 are of the full com- plementary configuration. Q14, Ql5 and Q16 are N channel MOSFETs in parallel for the positive half of the signal, and Q17, Q18 and Q19 are P channel MOSFETs for the negative signal half.

  • Page 17: Component Values

    All resistors are ‘1’4 watt 5% carbon film unless otherwise noted. 470,000 ohms 1,800 ohms 47,ooO ohms 47,000 ohms 560 ohms 560 ohms 47,000 ohms 560 ohms 560 ohms 1,800 ohms 1,800 ohms 270 ohms 47 ohms 47 ohms 47 ohms 47 ohms 1,800 ohms 1,800 ohms...

  • Page 18: Ac Line Connections For Overseas Use

    AC LINE CONNECTIONS FOR OVERSEAS USE power transformer supplied in DH-500 amplifiers sold in the USA is intended for 120 volt, 60 Hz operation only. For use in other countries, a multi-voltage transformer is supplied in Export versions, available at higher cost. It has dual tapped...

  • Page 19: Kit Parts List

    KIT PARTS LIST KIT PARTS LIST Minor variations may sometimes be encountered in value or appear- ance. These will not affect performance. Some of the hardware listed here has been used to secure parts for shipping the kit. Chassis Cover Front plate (rack mount) Front panel (inside) Handle...

  • Page 20: Service And Warranty

    DH-502 INSTALLATION INSTRUCTIONS Disconnect AC power from the DH-500 and remove all connect- ing cables. Remove the 17 screws which secure the cover along the top front, sides and rear. Set cover aside. DO NOT GRAB THE AMPLI- FIER PANEL OR HANDLES WHEN THE COVER IS RE- MOVED.

  • Page 21: Limited Warranty

    This warranty is limited to repair or replacement of the DH-502 bridging module only. Hafler is not responsible for consequential damages. This warranty gives you specific legal rights. You may also have other rights which vary from state lo state.
  • Page 23 WARRANTY FOR KIT-BUILT UNITS The parts in a DH-500 kit are warranted for a full year from the purchase date. If a defective component is found on a circuit board or in a kit, simply return the...

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