A very complete, over 50 parts, Phono/Line/Power Supply mod. Line stage only modifications
have been added
The phono stage receives a thorough refreshing with new film input coupling cap,
new RIAA caps and resistors, much lower frequency roll-off point via much larger
DC restoring cap in feedback loop. A high quality multi-turn adjustable DC offset
pot is used to eliminate the traditional DC coupling cap at the output of the stage.
Your line stage is now DC coupled with added phase integrity. Typically there is
a capacitor at the input and output which corrupts the signal! Larger time constants
via FB loop modifications are engineered into the design to give a more spacious
stage with better instrument location clues, an authoritative natural quality.
Power supply is enlarged with superior capacitors and high frequency bypassing producing
better stability and noise performance.
LX Elite modification utilizes superb quality Elna Silmic II capacitors, superior
film caps, Schottky power rectifiers, additional superb sounding resistors in strategic
locations and all the great high-quality parts/procedures from the standard modifications.
Elite has a more majestic sweep of power and emotion. It gets the musical timbres
more correct and complex at the same time. Instruments have a more pinpoint location
within the image. At the same time it even more relaxed and tempo accurate. Superb!
LX PREAMP MOD:Line Stage Only Modifications:$169/kit, $289/installed in line stage
only for most Hafler preamps, mod is installed only for SE-100.
Update modifications for earlier versions of our Musical Concepts standard modification:
$379 installed only #
#Due to the construction techniques used in the DH-110 it is subject to noise and
loss of channel issues which are strictly mechanical. Correcting these issues in
the right way is time consuming. Extra charges may apply to preamps that are not
clear of these issues when they are received for service.
MC-3 Preamp Circuit Board Modification
Phono, line stage and four individual power supplies are on board. Make no mistake!
This is a "State of the Art" sound. Preamps with the MC-3 board are often accused
of sounding tube-like, vividly three dimensional and very dynamic while retaining
a solid bass authority. We plead guilty. The MC-3 fits HAFLER DH-101 - kit available.
Factory installation available for the HAFLER DH-101,HAFLER DH-100, DH-110 and SE-100
preamps. <<<<<<CUSTOM INSTALLATIONS are available. We have installed this board in
many other preamps including the Dynaco PAT-4 / PAT-5, Mod Squad Line Drive, Spectral
and even a tube preamp.>>>>>> The OPS-8 listed below is always recommended, and sometimes
required. HAFLER DH-100, DH-110 and SE-100 preamps require the OPS-8 when used with
Phono stage with excellent RIAA response
Adjustable DC offset in phono eliminates need for output capacitor
DC-Coupled line stage with very wideband performance
Totally discrete transistor circuitry, no ICs
Totally dual-mono construction on one board
Dual-Mono regulated power supply
Completely independent power and ground systems
MC-3 circuit card:$299 kit (with dual mono/dual concentric volume control*). Installation
$150 (DH-101) to $175 (DH-100/110 and SE-100). *Volume control not included with
Hafler DH-100/110/SE-100. Important Note: tone controls/filters are eliminated.
>>>>For Elite versions, add $100 for Line Stage/Power Supply ( includes outboard
power supply mods ), $75 extra for Phono stage.
Hafler Preamp Model 915 and Tuner/Preamp Model 945
Similar in concept to our well respected Hafler DH-101 mod, here we have many mods
to line stage, coupling caps, feedback circuit and internal regulated power supply.
The quality of the sound is enhanced with wide dynamics, sweet tonal quality and
more precise soundstage. An already good product, becomes a finer more sophisticated
instrument. Recommended - OPS-4B Outboard Power Supply, described below.
915/945 mod: $399.00 installed. Elite version is $549.00 installed
OPS-4B outboard power supply is for Hafler DH-101, DH-110, 915 and 945. It has one
+30VDC and one -30VDC output. OPS-8 has dual + 30VDC outputs, i.e. dual-mono required
for MC-3 circuit board. They are equipped with a quiet toroid transformer and high-quality
capacitors. OPS-8 is dual-mono configuration for MC-3 preamp board.
Expect excellent dynamics, low noise, tonal purity, maintenance of distinct instrumental
clarity at even high volumes.
We do a lot of custom power supplies from the basic to the exotic. Call with your
OPS-4B: $Call(built and tested) with shielded output cable. Installation $75.00
OPS-8: $Call kit (built and tested) with shielded output cable. Installation:$75.00