Hafler DH-110 preamplifier

The DH-110's low noise and distortion, versatily control center is the standard bearer of the Hafler line. The DH-110 challenges comparison at any price on any criteria.

The improvements the DH-110 lends to your system are obvious the moment you start to listen. A three-dimensional image takes shape, acoustics are more accurate, voices are more precise transients are more articulate.. With the DH-110 reproduced sound becomes real.

Facilities include two magnetic phono inputs, two complete tape circuits with monitoring facilities and LED indication of monitoring mode a separate input-output loop for an equalizer or other signal processor a switchable highpass filter easy conversion to rack mounting (adapters are supplied), a front panel jack for most high impedance headphones, or for tape recording, and two pairs of audio outputs - one of which is switched by the headphone jack for private listening.

The full complementary symmetry circuit employs all discrete silicon transistors - no ICs. Precisions components hold very tight tolerances on inter-channel balance and RIAA equalization. This assures accurate phase relationships for correct spatial perspectives. An integral muting circuit eliminates turn-on and turn-off annoyances. The precision volume control ,maintains accurate balance between channels. The tone controls are effective while audibly unobtrusive but may be totally bypassed.

Less obvious significant refinements include a full power bandwidth that extends to 200 kHz, easily accommodating problem signals, a low impedance power supply; the use of low distortion low dielectric loss capacitors; silver plated contacts on the selector switches for long term noise-free operation; internal grounding of unused inputs for lower crosstalk; internal sockets for phono loading capacitors to accommodate specific cartridges; and a very wide phono acceptance level to handle the full dynamic range of the best cartridges.

 

Specifications

Phono Preamplifier Section

Rated Output:  3 V rms, 8 Hz to 105 kHz

Max. Output: 12 V rms at Rec Out

Total Harmonic Distortion :  0,0006% at 3 V rms

RIAA Frequency Response :  20 Hz - 20 kHz +0 dB  -0,25 dB

RIAA Equalization Accuracy:  30 Hz to 15 kHz +0 dB -0,1 dB

Sensitivity (1/2Volt at Rec Out) :  10 mV

Max. Input Signal (at 1 kHz):  300 mV (3 V at 20 kHz)

Gain:  34 dB at 1 kHz

Input Impedance:  47 k Ω  in parallel with 30 pF. User Adjustable. Plug in capacitors are installed to increase this to 150 pF/Phono1; 250 pF/Phono 2

Signal-to-Noise Ratio:  87 dB below 0,5 Volt output

Slew rate:  12 Volts per microseconds

Line Amplifier Section

Rated Output:  3 V rms 4 Hz to 210 kHz

Max. Output:  14 V rms, 20 Hz to 20 kHz

Total Harmonic Distortion less than 0,001%

Frequency Response:  20 Hz to 20 kHz +0 dB -0,1 dB

Sensitivity:  50 milivolts

Max. Input Signal (at 1 kHz): 14 V rms, volume control at -20 dB

Gain:  20 dB

Input Impedance:  better than25 k Ω

Signal-to-Noise Ratio:  105 dB

Slew Rate:  12 Volts /µsec

Crosstalk:  72 dB down

Separation:  better than 82 dB at 1 kHz; 52 dB at 20 kHz

Bass Control:  ±17 dB at 20 Hz (variable turnover)

Treble Control:  ±17 dB at 20 kHz (shelving at 5 kHz)

Filter Control:  25 kHz -12 dB/oct

General Specifications

Semiconductors:  30 Transistors; 3 ICs; 12 Diode; 2 LEDs

Inputs:  2 x Phono, Tuner, Aux, 2 x Tape, EPL

Outputs:  2 x Tape (buffered), 2 x Line EPL, Headphone jack

Intermodulation Distortion:  below residual of instrumentation

AC Power:  100 - 130 and 200 - 260 V, 50/60 Hz 3,5 Watts

AC Convenience Outlets:  2 switched 1 unswitched

Dimensions  (W x H x D):  17" x 3" x 8-1/2" + 1: knobs, 19" rack mounting

Weight:  10 lbs net