That drove me to put the dh101 back into the system. Hafler is the standard by which your work deserves to be judged. All the switches are clean and work perfectly and were tested on a scope. A few days ago i asked for opinions on the hafler dh110 preamp vs the nad 1020. It is amazing how just cleaning up the input wiring made quite a large difference in sound. This particular unit is not stock and was modded by one of the mod squad who are famous amongst the collectordiy forums. This 30yearold sample easily put out 77 wpc continuous and 118 w burst power into 8. Original volumebalance pot for dh 101 hafler preamp 11. In 1954 david haflers 50 watt tube amplifiers shocked the audio world. This upgrade kit will change that by providing a level of performance that is equal to many of the finest preamplifiers ever produced for a fraction of the cost. If it could sound better it would probably take younger ears than mine to notice. I thought i would start a thread on peoples experiences and tweeks for the hafler dh101.
This amp uses a single ground wire to the speaker common, then to the board output. I had mentioned that i was going to pull the pre apart and rebuild with fancy capacitors and an upgraded power supply, etc. Below you will found our manuals on the hafler dh101 kit. Mosfets are solidstate devices that work on principals more similar to vacuum tubes than bipolar transistors and it sounds great. The sockets on the back are not audiophile grade and they tend to bend everytime i hook a wire on it. When david hafler sold his hafler and acoustat companies to incar audio manufacturer rockfordfosgate a year or so back, things went quiet for a while as the new owners made arrangements to transfer production of both brands to their arizona facility and took stock of where their new acquisitions stood in the marketplace. Discussion in audio hardware started by veech, oct 15, 2009.
My system sounds as good or better than those that are 5 to 10 times the cost. Face is very clean with a few small very small areas that have been touched up with the point of a. Hafler dh110 manuals manuals and user guides for hafler dh110. Ext patch from jacks twist around the new loop, stripping if needed. To get the paspro 1 tube upgrade in the hafler you need a 101 chassis. I have one that is acting wierd as in strange balance pot behavior. Manuals list manuals for audio, music, stage and studio. Vacuum tube modification for hafler dh101 preamplifier. The hafler dh120 is a very high quality 60 wattsperchannel mosfet class ab stereo power amplifier.
Hafler dh101 humm youtube its humming along nicely i know it wants to try to sing, and it can, but also hums too. Vintage hafler dh160 stereo graphic equalizer ashfield. The sound was probably being degraded by the old switches. I have had my dh200 for 23 years and never any problems. This upgrade kit was designed by an audiophile for an audiophile and can be easily installed by those with no. So far i have removed all wiring to the input selector switches, mono switch, dubbing switch and the ext. A classic 1980s designer preamplifier to enjoy and treasure. Hafler dh101 preamp since one channel works, chances are the power supply is fine but check it anyway. This was a kit version and i think somebody might have fat fingered a step. Although the hafler didnt have the balance of the other two, it was the only one that was not veiled. A lowhum 9 volt battery powered model will suffice, to ensure a clean phono signal to the dh101, which has one of the finest phono circuits ever made. Hafler dh101 assembly and operation instructions manual. Differencefrequency distortion is extremely low at 104 db, while a typical amp is at 90 db. Hafler dh220, very good condition original version.
My musical concepts paspro 1 tube preamp is really making me happy. Happy paspro 1 owner paspro 1 link installed in hafler dh101 chassis with custom outboard power supply. This is a line stage and power supply upgrade kit for the hafler dh101 preamplifier with an optional phono stage upgrade kit available at the bottom of this listing. Hafler dh101 2 channel preamplifier euc black amp hifi audiophile. Lx modification techniques include changes in the feedback loop, existing rfi input filter, bias circuitry, power supply, bypassing, compensation caps, etc. He almost succeededthe dh200 proved an excellent platform for almost unlimited tweaking called poogeing by cognoscenti. Videos tutorials documents manuals hafler ha15 professional solid state headphone amplifier. Next step would be too put a signal into the nonworking channel and trace it through with an oscope to see whats not working correctly. Full text of radio electronics october 1980 see other formats. The quality of the sound is enhanced with wide dynamics, sweet tonal quality and more precise soundstage. Full text of electronics australia 1980 internet archive. With this highpowered kit, david hafler attempted to do for solidstate amplifiers what hed already done for tubed designs with the dynaco stereo 70.
Looks like the original rubber feet have been replaced. Its 115 watt per channel power rating is sufficient. A lowhum 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. Does anyone have a copy of the dh101 wiring foldout.
The david hafler dh101 i bought this as pre power set and am going to keep my current preamp for a number of reasons over the hafler. Mostly i prefer the remote control function and have a separate phono to do vinyl duties. View and download hafler dh101 assembly and operation instructions manual online. Hafler diagrams, schematics and service manuals download for free. In my experience, you plug it in, switch it on, select the right input and then rotate the volume control to the right volume and relax and listen. Ac switching of most audio preamplifiers hafler, like the dh101. David hafler used to be right across the bridge in pensauken nj and my brother spent a lot of time together. All in all, since my brother built hafler kits on the kitchen table when i was a kid, they were quality components. Similar in concept to our well respected hafler dh101 mod, here we have many mods to line stage, coupling caps, feedback circuit and internal regulated power supply. Dh120 dh200 dh220 dh500 gx 2300 gx 2600 gx 2800 p p1500 p225 p230 p3000 p3100 p4000 p500 p505 p7000 pro1200 pro2400 pro6000 se120 se240 series 9 series 9180 series 9270 series 9303. In addition to the stock phono stage, this unit includes the optional internal dh112 prepreamp for additional flexibility with moving coil cart. The unit is rugged and functions well, with the exception of a missing rca jack on the right channel input, which could be fairly easily repaired by someone with moderate soldering iron skills and a trip to radio shack. Scribd is the worlds largest social reading and publishing site. We have 1 hafler dh110 manual available for free pdf download.
Well i removed all the switch wiring and wired what i needed. Hafler dh160 10 band per channel graphic eq from the mid 80s in excellent working conditionvery well built unit weighing in at a solid 8. Match with the best possible prepreamplifier if running a moving coil stereo pickup for lp playback. Hafler dh220 power amplifier may 25, 2012 may 25, 2012 3 minute read by admin. Scroll this the hafler dh220 is a two channel audio power amplifier designed to the very highest performance standards.
Stock hafler dh200 on the way to us now for your choice of mods080918. Dh100 dh101 dh110 iris se100 series 915 series 945. They await a mod package to satisfy your listening needs. I use a 12au7 based triode preamp and i believe that a tube pre with a ss power amp makes the music much better. Hafler dh120 dh200 dh220 amp restoration kit repair service fix recap. Being 20 minutes away from john at musical concepts is a lucky break for me as he has helped me alot. Hafler dh110 solve device problem videos, documents. It is available either as a kit, or fully assembled. Monitor selector, monostereo, filter, external processor loop. The power switch fails, due to excessive inrush currents see fix below.
View and download hafler series 2 dh100 owners manual online. If your contro doel uni nostt provide switching capacity sufficient for the amplifier 5 ams p needs plus other equipment it is als o switching, you should use the amplifiers own power switch. I had the hafler dh101 preamp for a very short time and it sounded way too harsh. Wired it up to my project xpression iiishure v15iii and jbl 6230kef c40 setup earlier this evening. John, i want to thank you again for the superb preamp you built. I just bought a used dh101, what does the tone button do. A in depth look at david hafler s dh101 preamplifier.
This is a used david hafler 10band stereo graphic eq, model dh160, circa 1982. Regards this is in line with borlely 1981 modification of the dh200. It did come out quieter than before, although i was also battling some substandard audioquest cables at the time. Download the hafler dh101kit manuals for free hifi manuals. Full manuals list manuals and schematics mr manuals. Since then the preamp has been well received in the marketplace and is generally considered the best sound value for the dollar spent.
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