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Ear+ Purist HD
Ear+ HD300
Limited Commemorative Edition
High Definition Stereo Headphone Amplifier
Users' Manual
Revised Nov. 28/13
Mapletree Audio Design
Lloyd Peppard
R. R. 1, Seeley's Bay, Ontario, Canada, K0H 2N0
(613) 387-3830
www.mapletreeaudio.com
info@mapletreeaudio.com
© Copyright Lloyd Peppard 2013
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Summary of Contents for Mapletree Ear+ HD300
- Page 1 Ear+ Purist HD Ear+ HD300 Limited Commemorative Edition High Definition Stereo Headphone Amplifier Users' Manual Revised Nov. 28/13 Mapletree Audio Design Lloyd Peppard R. R. 1, Seeley's Bay, Ontario, Canada, K0H 2N0 (613) 387-3830 www.mapletreeaudio.com info@mapletreeaudio.com © Copyright Lloyd Peppard 2013...
- Page 2 If power fails to come on, you can check the fuse and replace with a spare if necessary. If the fuse blows a second time, you should not try to operate the unit. Contact Mapletree Audio Design for information regarding service.
- Page 3 Heat______ It is normal for the chassis to become quite warm after an hour or so. During operation, around 70 W of power is continually dissipated as heat, even when no input signal is applied. This is characteristic of a class A power amplifier, even a low power one such as the HD300.
- Page 4 Hd300 Power Headphones Volume MAD Ear+ HD300 Specifications ______ Frequency response at 10 mW output (50 ? load): 20 Hz–20 kHz –0.5 dB Maximum undistorted output at 1 kHz (50 ? load): 0.2 W (0.3 W into 32 Ohm load)
- Page 5 Max gain: 15 dB (voltage gain = 5.6) Channel balance: within 0.5 dB at all volume control settings Output impedance at 1 kHz: 3.2 ? ?(damping factor = 10 with 32 ? headphones)? Input impedance: 100 k? ? Hum and noise at output (max volume): less than 0.1 mV rms Recommended load impedance: 16–600 ? Phase: non-inverting Power consumption: 70 W, 120 VAC 50-60 Hz...
- Page 6 Mapletree Audio Design Ear+ HD300 Headphone Amplifier © Copyright Lloyd Peppard 2003-2013 Rev. Nov. 28/2013 Vg1 = -3 V Va = 115 V Vg = -50 V Ia = 1.6 mA Va = 129 V Vg2 = 107 V Ia = 44.5 mA Ig2 = 0.5 mA...