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INTRODUCTION
Your preamplifier is the control center of your music
system, acting as an interface between the sound
sources-record players, tape recorders, FM and Video
tuners-and the power amplifier which drives the
loudspeakers. As the focal point of your system, it should
be attractive and easy to use, versatile and yet functionally
unobtrusive. It should contribute a minimum of noise or
distortion while providing signal amplification, control of
the signal level, and applicable modification of the fre-
quency response.
The DH-110 achieves all these objectives with great
versatility, providing for two record players with magnetic
cartridges, two tape recorders, a tuner, and an additional stereo
input for a compact (digital audio) disc player or video audio. It
also includes inputs and outputs for an external signal processor
such as a graphic equalizer, time delay device, or noise
reduction unit. The performance of the DH-110 is exemplary,
and its assembly from an array of discrete components of
exceptional quality should ensure reliability and longevity of its
capabilities.
Exceedingly low noise and distortion is a hallmark of the
DH-110. Noise is essentially inaudible in the absence of a
signal, and distortion of all types, both steady state and
transient, is at or below the threshold of the finest mea-
surement capabilities. These excellent characteristics are
maintained far outside the customary 20 Hz to 20
kHz
band, and signals well beyond that are handled without the
need to restrict bandwidth.
Precise interchannel balance at all frequencies is main-
tained with close tolerance components, and RIAA phono
equalization is engineered to very narrow limits, maintain-
ing accurate phase relationships and correct spatial
perspectives, as well as exceptional unit-to-unit consis-
tency. The tone controls, which can provide contouring of
response for individual needs when switched in, are nor-
mally isolated from the circuit for ruler-flat response.
The components in the DH-110 have been selected for
their superb audio performance as well as for their reliabil-
ity. They have been incorporated in the unique Hafler fully
complementary symmetry push-pull circuit in a carefully
designed circuit board layout which reduces crosstalk and
maintains separation for a synergistic audio result that
defies comparison, regardless of cost.
Those who have chosen to build the kit will find that its
step by step instructions will ensure a properly working
unit even for the novice builder. A substantial amount of
preassembly has enabled us to check out each kit in nearly
every aspect of performance, and makes the DH-110 a par-
ticularly fast, easy and enjoyable construction project,
which you will likely complete in one evening.
We suggest that you read the installation and operation
sections of this manual carefully, even though much may
be familiar to you. There are some subtle and significant
points which may be new, and their proper appreciation
will enable maximum satisfaction with your DH-110. We
wish you to have the very best in sound.
CONTENTS
Installation
..........................
Page 4
Operation
............................... .5
Assembly Instructions. ................... .7
Building the Kit
.......................... .9
PC-14 Diagrams
........................ .12
If a Problem Arises
...................... .15
Overseas AC Line Connections
..........
.15
Additional Information .................. .16
Functional Block Diagram
............... .16
Component Values
.....................
.19
Schematic Diagram
..................... .20
Kit Parts List
........................... .22
Service and Warranty
................... .23
Pictorial Diagram
.....................
Insert
3