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Ear+ Purist HD
Ear+ HD Super II
High Definition Stereo Headphone Amplifier
Users' Manual
Rev Feb. 25/13
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 2008-13
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Summary of Contents for Mapletree Ear+ HD Super II
- Page 1 Ear+ Purist HD Ear+ HD Super II High Definition Stereo Headphone Amplifier Users' Manual Rev Feb. 25/13 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 2008-13...
- Page 2 Introduction The Mapletree Audio Design Ear+ HD Super II Stereo Headphone Amplifier represents a high performance development of the Ear+ family. The use of a high capacity power supply provides increased power output and lower driving impedance employing widely available EL84 output tubes and 12AX7/5751 drivers. The separate power supply chassis allows flexibility in positioning each unit and reduces the heat seen by components in the main amplifier chassis.
- Page 3 The RCA input jacks (IN 1– IN 2) are wired in parallel to permit patching the source signal to a preamp or integrated amp without the need for Y-adaptors. Left channel jacks are at the top. The input impedance is 50 k? . The headphone output jacks are standard ¼"...
- Page 4 Infrequently, a heater may burn out which is indicated by total loss of sound. The Ear+ HD Super II is supplied with 2 – 5751/12AX7 (driver), 2 – EL84/6BQ5 (output) tubes. Matched pairs are not required.
- Page 5 MAD Ear+ HD Super II Specifications______ Frequency response at 1 V rms (20 mW) output into 50 Ohms: 1000 10000 100000 Frequency (Hz) Maximum undistorted output at 1 kHz: 4 V rms with 50 Ohm load connected to Hi Z output (= 0.32 W).
- Page 6 Mapletree Audio Design Ear+ HD Super II Headphone Amplifier © Copyright Lloyd Peppard 2010-13 Rev. Feb. 24/13 12AX7/5751 +235 V +120 V Headphones IN L EL84 Hi Z +307 V Tant Volume Hammond 119DA Chassis 600:8 Alps Headphones 1% MF +1.12 V...