Related Manuals for Hafler HA75
Summary of Contents for Hafler HA75
- Page 1 HA75 Tube Head Headphone Amp U s e r G u i d e Hafler is a division of Radial Engineering Ltd. 1588 Kebet Way, Port Coquitlam BC, Canada V3C 5M5 (604) 942-1001 info@hafler.com www.hafler.com...
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Page 2: Table Of Contents
CAuTIon HIGH VoLTAGe There are high voltages inside the HA75. Before opening the unit - It must be unplugged from the power supply and allowed to discharge for at least 30 minutes. Touching the wrong place can cause a severe shock. -
Page 3: Overview
The Hafler HA75 uses a 12AX7 tube as part of the signal amplification. Tubes are preferred by audio enthusiasts and recording engineers for their smooth, natural sound. The HA75 tube sound will reduce ear fatigue compared to typical solid-state counterparts. -
Page 4: Features
FeATuReS on: Activates the HA75. It is recommended to warm up the tube for 15 minutes to achieve thermal stability. SeLeCT: From the front panel you can select between two different inputs designated as A (balanced/unbalanced) and B (unbalanced). FeedbACK: Controls the amount of negative feedback that is being introduced back into the circuit. - Page 5 Tube ouT: Add the Tubehead's warm tube character to a signal path between a preamp and power amp if desired. 10. THRu: Un-buffered thru-puts that bypass the HA75 circuitry. 11. InPuT-b: Unbalanced RCA inputs to connect any -10dB line level source to the HA75.
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Page 6: Connect
Once you are up and running, you can add a second source to the HA75 by connecting it to input-B. Switching between the two sources is done using the front panel select switch. - Page 7 If you are using the HA75 in the studio, it is equipped with balanced XLR female inputs that follow the AES standard with pin-1 (ground), pin-2 (+) and pin-3 (-). These are paired with the input-A connectors. Use the selector switch on the rear panel to toggle between the unbalanced RCA inputs and the XLR inputs.
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Page 8: Testing Your Connections
(VOX) to the middle position. Plug in your headphones and then turn up the source audio system to a low level. Slowly increase the level on the HA75 using the big volume control knob in the middle. Testing at low volume will prevent damage to your headphones and protect your hearing should a connection be faulty. -
Page 9: Feedback Control
2 o’clock. To activate, depress the switch. The feedback control is configured so that when in the full clockwise position (5 o’clock) there is no feedback and the gain of the HA75 is at maximum. This position will introduce more harmonics and warmth but will also measure higher THD as the tube is operating wide open. -
Page 10: Understanding The Focus Control
THe FoCuS ConTRoL One of the particularly cool features built into the HA75 is the Focus control. This enables you to simulate the effect of listening to music in a free air space, as if playing music through speakers in a typical room. In essence, you can adjust the stereo image to suit. -
Page 11: Understanding The Vox Control
12AX7 if the user does not agree with our selection or has some other preference. It is however important to note that the HA75 is biased for the 12AX7 and use with a 12AU7 or 12AT7 will not sound good at all. -
Page 12: Warranty
(excluding finish and wear and tear on components under normal use) for a period of three (3) years from the original date of purchase. In the event that a particular product is no longer available, Hafler reserves the right to replace the product with a similar product of equal or greater value. In the unlikely event that a defect is uncovered, please call 604-942-1001 or email service@hafler.com to obtain a RA...
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