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Home › Magazines › 2009 › July/August › Improved Hybrid HeadPhone Amplifier

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Improved Hybrid HeadPhone Amplifier

Published in issue 391, July/August 2009

Improved Hybrid HeadPhone Amplifier
Jeff Macaulay’s excellent single valve ECC82/12AU7 'Hybrid Headphone Amp' (HHA) published in spurred the author to implement some modifications culminating mainly in an additional input preamp. The resulting project was then slightly reworked In the Elektor Audio Labs and the result is shown here, along with a PCB design to Elektor standards.

Extra info, Updates

Components

Relevant products

Specifications

Voltages measured w.r.t. circuit ground
T1/T6 base 0.7 V
T2/T7 base 1.4 V
T3/T8 base 3.8 V
T3/T8 Emitter 2.8 V
ECC82 grid 4 V
T10/T12 Emitter 6.2 V
T9/T11Base 0.67 V
ECC82 anodes 10 V
ECC82 pin 5 9.4 V
D2 (across device) 0.8 V
T5 VCE 1.3 V
R6/R14 (across device) 6.85 V

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Magazine July/August 2009
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