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LXII modifications for Hafler DH-100, DH-101, DH-110

There’s no explaining the level of surprise you will have when you hear this modified preamp, but let’s try. Low expectations in this case aren’t fair. There could be an eye roll but not after a short listen. These modified DH-110s are being used in some very fine systems. A very complete Line stage/Power Supply mod or a full modification including your phono stage is now available for your Hafler DH-101 or DH-110. We are introducing the first model revision in many years. The old version was good enough to have a long run but now we have a real treat for Hafler owners. We have parlayed some of our experience in optimizing several other upgraded models into useful techniques to enhance the Hafler solid-state preamps. Transform your Hafler into a musically compelling, natural sounding, sweeter fatigue preamplifier.

The phono stage receives a thorough refreshing with new film input coupling cap, many new premium caps and resistors. Optionally we can give you higher gain up to a point.

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! Unreliable FET muting device is also removed. Power supply mods provide the thump-free output.It all yields quite striking improvements in sweetness and a sense of ease to the music at all frequencies and levels. Premium parts in FB loop modifications are engineered into the design to give a more spacious stage with better instrument location clues, and an authoritative natural quality.

Power supply is enlarged with superior sounding capacitors, better reference voltage section/stabilization and high frequency bypassing producing better stability and noise performance. This is an important new design feature.

LXII Elite modification utilizes superb quality Nichicon Muse 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’s even more relaxed and timbre/tempo accurate. Superb!

Standard Level Modifications for Hafler DH-100, DH-101, DH-110

LXII Preamp Mod

Line Stage Only Modifications: $319/installed only in line stage. Includes a number of power supply upgrades. #

 

LXII Full Preamp Modification(RIAA Phono + Line Stage): $429 installed(full mod) # Full mod includes power supply, phono,line stages.

Update mods for earlier versions(original buyer, 5 yrs old or newer) of our Musical Concepts standard modification: $229 installed only  #

>>Update Mods<< This is for earlier versions(original buyer, 3 yrs old or newer) of our Musical Concepts modifications: $219 installed only for Line Stage version, for ‘complete’ mod $299 installed  #

Elite Level Modifications for Hafler DH-100, DH-101, DH-110

LXII ELITE Preamp Mod

Line Stage Only Modification:  $399 installed only in line stage. Includes a number of power supply upgrades. #

LXII Full Elite Preamp Modification(RIAA Phono + Line Stage): $599 installed(full mod) # Full mod includes power supply, phono, line stages.

>>Update Mods<< This is for earlier versions(original buyer, 3 yrs old or newer) of our Musical Concepts modifications: $299 installed only for Line Stage mod, $399 installed only for Complete Mod  #

#Due to the construction techniques used in the DH-101 and DH-110 they are 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. <<<<<<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 and DH-110 preamps require the OPS-8 when used with the MC-3. 

• 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
• Dual-Mono power rail distribution
• Power and signal ground systems independent by channel

MC-3 circuit card: $699 installed only for DH-101. $749 for DH-110 *Volume control not included with Hafler DH-100/110. Important Note: tone controls/filters are eliminated in all modified preamps, those functions are not built into the the MC-3. On the DH-101 the bass and treble controls are replaced with short bolts for remounting the knobs so that your preamp looks like any other DH-101. With a DH-110/SE-100 the MC-3 in installed like a daughter board. This requires clearing an area of parts on the main board no ‘taller’ than a resistor to fit the board into the low profile of these preamps. Then the MC-3 is wired into the switching/control system of the main board. An outboard power supply must be used in these since the power transformer must be removed or is inadequate for fitting/operating the MC-3.

>>>>For Elite versions, add $100 for Line Stage/inboard Power Supply, $100 extra for Phono stage.<<<<

Update Versions: If you have an older MC-1/2/3 and want to update the unit either ship it in for a quote.  

Hafler Preamp Model 915

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 mod: $399.00 installed. Elite version is $499.00 installed

For the rare version with phono stage add $150 for basic, $250 for Elite

>>We do not modify the 945 Preamp/Tuner<<

Outboard Power Supply

<<<NEW PICTURES SOON>>> What can you expect from an outboard power supply? Getting the best is an enduring investment. The sound is its own reward. Many of our customers wanted custom power supplies so we offer a range of options.

The Sound

• Excellent dynamic scaling from pianissimo to crescendo reminds you more of the real event
• Low noise, beyond the risk of hum or buzz a subtle ‘dirty window’ effect goes away
• Tonal purity, excellent dynamics and low noise contribute to low coloration
• Maintenance of distinct instrumental clarity even at high volumes
• All models includes IEC power cord socket and appropriate standard power cord.
• All are custom built, bench tested and supplied with shielded output cable

OPS-9S(Standard):  $299, transformer only - with AC output, to be rectified to DC in target device not intended for MC-3 installations

OPS-9D(Deluxe):   $499(+ DC output)

OPS-10:  $799, beautiful case, premium parts

Installation:  $75 labor for any model for most preamp installations

OPS-9 Deluxe and OPS-10 models have one +30VDC and one -30VDC output(values approx). They are equipped with a quiet toroid transformer.

>>>>These power supplies can be delivered with alternate voltages AND for tubed preamps with B+ and heater power supplies.<<<<