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Ear+ Purist HD
Ear+ HD II
High Definition Stereo Headphone
Amplifier/Passive Preamplifier
Users' Manual
Rev June 20/19
Mapletree Audio Design
R. R. 1, Seeley's Bay, Ontario, Canada, K0H 2N0
(613) 387-3830
www.mapletreeaudio.com
info@mapletreeaudio.com
© Copyright Lloyd Peppard 2003-19
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Summary of Contents for Mapletree Ear+ HD II
- Page 1 Ear+ Purist HD Ear+ HD II High Definition Stereo Headphone Amplifier/Passive Preamplifier Users' Manual Rev June 20/19 Mapletree Audio Design R. R. 1, Seeley's Bay, Ontario, Canada, K0H 2N0 (613) 387-3830 www.mapletreeaudio.com info@mapletreeaudio.com © Copyright Lloyd Peppard 2003-19...
- Page 2 Introduction The Mapletree Audio Design Ear+ HD II Stereo Headphone Amplifier/Passive Preamplifier represents the ultimate performance development of the Ear+ family. The use of premium passive components, including Nichicon Muse electrolytic and Panasonic polypropylene capacitors, yields noticeably enhanced bass definition, inner detail, and transparency.
- Page 3 A spare fuse is located in the fuse drawer. If the fuse blows a second time, you should not try to operate the unit. Contact Mapletree Audio Design for information regarding service.
- Page 4 Warranty___ Mapletree components are warranted for 2 years to the original purchaser for failure of all parts (excluding tubes). Tubes are warranted for 90 days exclusive of shipping cost. Service, including parts and labor (but excluding shipping), is free within the warranty...
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Page 5: Parts List
Parts List Reference Description Qty. 6 A rectifier bridge C1a,b 47uF/25V electrolytic capacitor (Nichicon Muse) C2a,b 30uF/500V polypropylene capacitor (Panasonic) C3, C4, C5 100uF/400V electrolytic capacitor (Nichicon) 10000uF/25V electrolytic capacitor D1-D4 MUR 2100 ultra high speed rectifier diodes (2 A, 1000 V) 10 mA LED (pilot light) with holder 1 A/250 V 20mm fuse J1a,b, J2a,b. - Page 7 MAD Ear+ HD II Specifications ______ Headphone Output (100 load) Frequency response at 1 V rms (10 mW) output: 1000 10000 100000 Frequency (Hz) Maximum undistorted output at 1 kHz: 1.5 V rms (70 mW across 32 Ohms) Gain: 10 dB Output impedance at 1 kHz: less than 4 ...