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Hafler DH-101

Stereo Active Pre Amplifier

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Hafler DH-101


Frequency response: 20Hz to 20kHz

Total harmonic distortion: 0.001%

Gain: 34dB (MM), 20dB (line)

Input sensitivity: 10mV (MM)

Signal to noise ratio: 86dB (MM), 90dB (line)

Output: 3V (Pre out)

Semiconductors: 28 x transistors, 2 x IC, 4 x diodes, 1 x LED

Dimensions: 350 x 82.5 x 215mm

Weight: 3.6kg

Year: 1978



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Reviewed May 19th, 2014 by megranat

A phenomenally revealing, pre-amplifier, requiring input from only the cleanest audio sources and ideal for driving its matching DH-200 power amplifier, which I have also reviewed on this site. Typical of all early David Hafler amplifiers (pre and power) this was mainly sold in kit form, so open the lid and check that yours has been built properly with high quality components and properly soldered connections. Also check the operation and clean engagement of its quite quirky front panel input switches that, if I recall correctly, had a little roller of white material inside their transparent buttons that made them appear to turn white when pressed home. These units are getting on now but, when I had mine in the late 1980s (built and modified to my requirements with miltary spec capacitors, the balance control bypassed and a crackle-free Teflon volume pot) the results were spine-tingling. A classic 1980s designer pre-amplifier to enjoy and treasure. Match with the best possible pre-pre-amplifier if running a moving coil stereo pickup for LP playback. (A low-hum 9 Volt battery powered model will suffice, to ensure a clean phono signal to the DH-101, which has one of the finest phono circuits ever made.)



re: DH-101

The phono input section was first published in the swedish magazine "Radio & Television" 1975 what month I don't remember. It was tested in the magazine and was found to have excellent capacities.

re: DH-101

I've cataloged some design revisions I noticed while rebuilding this pre-amp here:

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