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dm38

Table of Contents

Important Safety Instructions....................................................................2

Introduction.....................................................................................................3

Installation.......................................................................................................4

Unpacking.................................................................................................4

Positioning................................................................................................5

Connections.....................................................................................................5

Connecting the Mains Supply Cable...................................................5

Connecting the Loudspeakers..............................................................5

Connecting the External Ground.........................................................6

Bridging.....................................................................................................6

Running-in period...................................................................................6

dm38 Input Selections............................................................................6

Comments on the different dm38 inputs...........................................7

Operating Instructions.................................................................................8

Electronic Protection and Reliability........................................................9

Specifications for the dm38.......................................................................13

Care and Maintenance................................................................................14

Troubleshooting...........................................................................................15

Service.............................................................................................................16

Warranty.........................................................................................................17

Warranty Registration Form.....................................................................18

Summary of content (18 pages)

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dm38 TM Table of Contents Important Safety Instructions .................................................................... 2 Introduction..................................................................................................... 3 Installation....................................................................................................... 4 Unpacking................................................................................................. 4 Positioning ............................
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dm38 TM Important Safety Instructions This product shall be connected to a MAINS socket outlet with a protective earthing connection. Weighs 55kg (120 lbs.) per unit. Shipping weight- 85kg (187 lbs.). Never lift the amplifier by yourself. Always use two people to unpack or move the amplifier. Always bend at the knees when lifting. Do not strain your back. 120lb Designed for indoor use only, the dm range of amplifiers are not protected against liquids.
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dm38 TM Introduction Congratulations on purchasing the HALCRO™ dm38 Stereo amplifier. HALCRO™ designs and manufactures the only "Super Fidelity" amplifiers in the world. This "Super Fidelity" amplifier reproduces with better than 99.9997% purity of all tones across the entire audio range. The concept behind the electronic design was to create an amplifier, which did not color the sound with its own electronic characteristics. i.e. recreate the original sound as it was at the time of recording.
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dm38 TM Installation Ensure you have read the Important Safety Instructions section on page 2, prior to installing your HALCRO™ amplifier. If you require assistance in the unpacking and installation of your HALCRO™ amplifier, please contact your dealer. PLEASE NOTE: When lifting the unit, always use two people. The unit must be lifted by placing your hands under the middle of the bottom compartment. Do not lift the unit under the top compartment. Unpacking 1.
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dm38 TM Positioning We suggest that the dm38 be positioned as near to your loudspeakers as practical. This will reduce the length of the loudspeaker cable required. The sides of the unit house the heatsinks that are used to dissipate heat. The airflow to these should not be interrupted. Ensure there is at least 12 inches (300mm) clearance around the unit.
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dm38 TM Connecting the External Ground The dm38 is equipped with a separate ground terminal. The ground terminal has a green bezel and is located under the power supply. This terminal may be used to reduce hum and ripple in some circumstances. Bridging You may bridge the HALCRO™ amplifier, for details please email us at service@halcro.com A bridging kit is available through HALCRO™. Running-in period The dm38’s electronic running-in period is completed at the factory. running-in period is not required.
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dm38 TM Comments on the different dm38 inputs The balanced voltage input or current-mode inputs are most desirable for minimizing earth loop generated mains hum and ripple, or high frequency interference. Sources with current-mode outputs are rare and are most likely to have an RCA output socket. The advantages of this source are that: • • Earth loop generated mains hum and ripple are minimized.
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dm38 TM Operating Instructions • • • • • • • Once the external cables are connected to the unit, ensure the master ON/OFF switch is in the OFF position. (The master ON/OFF switch is situated on the base of the lower compartment, near the mains socket on the unit. You will have to kneel on the floor at the back of the unit to access the switch). Plug the mains plug into a mains outlet. Switch the master ON/OFF switch to ON. The LEDs on the front and rear of the amplifier will glow red.
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dm38 TM Electronic Protection and Reliability Electronic protection circuitry and amplifier reliability, alas, is an area sadly neglected by many high-end audio amplifier designers. HALCRO™ has paid a great deal of attention to this area. Components Our components are selected for not only performance but reliability as well, for example: • • All Halcro electrolytic capacitors are rated at a minimum of 105 degrees C instead of the usual 85 degree rating.
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dm38 TM Output current limiting In terms of maximum available output current, there are basically 3 amplifier type options: a. An amplifier with a reasonable limit placed on the maximum available output current. b. An amplifier with no limit placed on the maximum available output current, which will either blow a fuse or self destruct if excessive current is drawn, for example through a dead short. c.
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dm38 TM One also has to question the belief that an amplifier should be capable of such unreasonably high output currents. Consider the following facts: • • • • Most loudspeakers have impedances of 4 ohms (not 1 or 2 ohms). All valve amplifiers are output current limited, and yet the industry does not consider this a problem, which is inconsistent with the belief that maximum available current limiting is a problem.
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dm38 TM Unusual output conditions The vast majority of amplifier faults show up as high positive or negative d.c. output voltages. An independent circuit in the Halcro amplifiers senses any unreasonable d.c. output voltage and switches the amplifier off if this occurs. Likewise, if any excessive output current flows for an extended length of time, this also implies a fault and an independent circuit measures this and will shut down the amplifier.
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dm38 TM Specifications for the dm38 POWER Power output into 4ohms resistive > 350W Power output into 8ohms resistive > 180W DISTORTION (Footnote 1). At full power output, all harmonic distortion orders THD <-110dB (<3000 parts per billion) up to 20kHz (100kHz B.W.) at 350W into 4 ohms. THD @ 1kHz <-130dB (<300 parts per billion). For sum of 19 and 20kHz tones, each delivering 100W into 4 ohms = peak power 350W, intermodulation products each <-110dB relative to output.
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dm38 TM Care and Maintenance The HALCRO™ dm38 has been designed for indoor use only. Under no circumstances should the amplifier be allowed to get wet. The only maintenance required will be ensuring the unit is kept clean. Important HALCRO™ takes no responsibility for any damage caused through careless or improper cleaning techniques. Never use flammable products when cleaning the HALCRO™ dm38.
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dm38 TM Troubleshooting The HALCRO™ dm38 contains no user serviceable parts inside the compartments. Please do not attempt to open the unit as this will void the warranty and will expose you to dangerous voltages. For all service requirements please contact your dealer, or HALCRO™ at service@halcro.com Symptom No Sound or light 1. 2. 3. 4. Red light is on, No sound Green light is on, No sound Suggestion Ensure mains cable is plugged in to the amplifier.
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dm38 TM Service The HALCRO™ dm38 has been designed for maximum reliability. If a problem does occur with your unit, please contact your dealer. Contact your dealer to help you with some troubleshooting prior to organizing service for your amplifier. Your dealer or HALCRO'S service department will always try to help you correct any basic problems at your home via email or telephone. If service is required, all problems must be described in as much detail as possible.
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dm38 TM Warranty IMPORTANT - Please read the following details very carefully The dm38 is warranted to be free of defects if used under normal conditions for a period of ninety (90) days from the date of purchase. To extend the warranty period to five (5) years, please complete and return the warranty registration form. As mentioned previously, do not attempt to open up any of the amplifier compartments. The compartments are sealed at the factory.
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dm38 TM Warranty Registration Form One form must be completed for every amplifier. Title…………… First name………………………….. Surname……………………… ..................................... . Address………………………………………………….………………………………… ...... …………………………………………………………………….………………………….. ... Zip or post code………………………Country………………………………………........... Date of Birth Day………..Month………….Year………….. Phone numbers Home (……)…………………….. Work (……)…….……………. .......... . Facsimile numbers Home (……)………………… Work (……)……......... ……………….