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HAFLER DH 200
Beskrivelse av varen
Tilstand: Brukt
Legendarisk dual MosFet poweramp med nydelig lyd vurderes solgt.
Topp stand. Fabrikkbygget (ikke kit)
Bygget av David Hafler Company USA. Hafler arbeidet tidligere for amerikanske Dynaco. Søk på nett og du vil finne mye spennende.
Prisant 4000,-
Specifications
Power output: 100 watts per channel into 8Ω (stereo)
Frequency response: 10Hz to 40kHz
Total harmonic distortion: 0.012%
Damping factor: 50
Input sensitivity: 1.5V
Signal to noise ratio: 100dB
Semiconductors: 26 x transistors, 8 x MOSfet, 24 x diodes, 4 x zener diodes, 1 x diode bridge
Dimensions: 5-1/8 x 16 x 10-1/2
Weight: 11,8 KG
Reviewed May 19th, 2019 by Sage Freeman
Clear and crisp but not harsh with plenty of slam! A solid investment at any price. Then upgrade up the wahzoo if you like but I am enjoying mine just fine as is. Give it clean power and a clean signal and you are set for a great time!
Reviewed Apr 29th, 2018 by lappara
Allora le mie orecchie non mentono, considerato che siamo tutti d'accordo sulla qualità del suono, è veramente un grande amplificatore.
Ciao a tutti dalla Sicilia
Reviewed Dec 20th, 2015 by uzzy
I have had mine since 1979 .. I have since bought another just in case any of the output Mosfets go as the original Hitachi ones are getting very rare.
Plug it in and forget about it .. match it to the highest possible quality pre-amp you can afford (I use an Audio Research SP9) and just enjoy .. it has dynamics and detail in spades and if I lost mine I would be heart broken ..
Have tried many amplifiers over the years (including: Nakamichi, NAIM, Mark Levinson, Lux and EAR) but the Hafler is to me unbeatable for its overall performance ... I had a minor repair done by ex Naim engineer (i knocked off one of the transistors from the circuit board when changing the RCAs to gold ones) .. he was a bit dumfounded I think at how well this amp performs remarking nice amp when i picked it up after the repair.
It will drive below 4 ohms (e.g. Gale 401s and KEF 104/2 etc.) with ease. Gordon King in HiFi News and Record Review said it was the finest amp he had heard but it was of course rubbished in other HiFi Mags where the world began and ended with Linn/NAIM.
If you can find a good working example buy it - for the £200 (average second hand cost) it will cost you, you can then sit back with a big smile realising you will have to pay over 5 times more for something to get close to it or equal it .. and unlike a lot of other amps do not worry about the impedance of your loudspeakers this baby works down to 2 ohms with panache ..
if you were to take the insides and put it in a nice fancy solid aluminium case perhaps it would be taken more seriously .. a wonderful amplifier unequaled in its price range and well above ...
Reviewed Jan 29th, 2015 by Sealtest
Very nice amp with many upgrade options. This amp is also very affordable compared to other amps which perform about the same.
Reviewed May 19th, 2014 by megranat
A gutsy, revealing, very dynamic stereo, dual MOSFET power amplifier, suitable for driving the best made and positioned loudspeakers that you can muster (with input from the cleanest sources only or you will cower behind the couch at the nasties it exposes). Typical of all early David Hafler amplifiers (pre and power) this was mainly sold in kit form, so open the lid and check that yours has been built properly with high quality components and properly soldered connections. These units are getting on now but, when I had mine in the late 1980s, with its matching (but modified to my requirements with miltary spec capacitors, the balance control bypassed and a crackle-free Teflon volume pot) DH-101 preamplifier, driving a pair of sensational Stig Carlsson OA-51 two way loudspeakers placed against the wall, on timber stands the results were spine-tingling. If you can get your hands on that kind of setup, enjoy and treasure. A classic 100Wpc power amplifier that I still regret selling, along with its associated gear to help pay for my first house!
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The Hafler DH-200 is a 100 watts-per-channel MOSFET class AB stereo power amplifier. MOSFETs are solid-state devices that work on principals more similar to vacuum tubes than bipolar transistors — and it sounds great!
35 years ago when the DH-200 was introduced, it astounded the world in having performance so high that it exceeded the abilities of most laboratory equipment of its day. It was also reasonably priced, making this Hafler amplifier astounding both for its incredible performance and unheard of price.
Today I have the modern laboratory equipment to allow me to test exactly how good is this 35-year old sample, which I purchased in 1988. I also have an even older one that I built from a kit after getting it from Santa Claus for Christmas in 1981. Both have served me well for all these decades.
Like most made-in-USA audio gear, it easily outperforms its rated specification. This 30-year-old sample easily put out 116 WPC continuous and 164 W burst power into 8Ω.
The DH-200 was sold as a kit or fully assembled. The kits came with the two amplifier modules completely assembled and tested; kit assembly was assembling the case then wiring the power supplies, switches and connectors together.
Assembled versions came with a full 1-year warranty, and the kits came with a 1-year warranty on parts. In reality, I built a DH-200 from a kit in 1981, and about 15 years later I had a small problem and phoned Hafler. They recognized the problem and sent me two new transistors, free of charge. That fixed it and it's run perfectly ever since.
The amplifier tested here was purchased used in 1986 in Thousand Oaks, and I'm testing it today in 2014. It still easily exceeds its specifications nearly 30 years later, and I doubt it's ever been serviced.
This amplifier is from the very pinnacle of home High Fidelity. Products got better and better ever since home amplifiers were invented in the 1920s, but video took over home entertainment by the late 1980s, and home Hi-Fi equipment never evolved past this stage. Newer Hafler amplifiers, and the home audio market in general, has been neglected for lack of interest ever since the VCR became affordable to everyone in the late 1980s. There are newer amplifiers, but few are better than this Hafler DH-200.
David Hafler was one of the founders of Dynaco in 1954, and started the Hafler company in 1977.
Circuit Design
It's a traditional class AB linear power amplifier in a sheet metal steel case.
It has a traditional unregulated linear power supply with a big power transformer in the middle of the case, a bridge rectifier and two 10,000 µF 75V capacitors on which I measure ±55 VDC.
The "loose" regulation of the power supply gives it much greater burst power than continuous (perfect for music), and also means that power output doesn't completely double as speaker impedance halves.
It has eight power MOSFETs (4 per channel) in TO-3 packages mounted to two big anodized aluminum heat sinks on opposite sides of the case.
There's a neon pilot light in the power switch as well as a yellow overtemperatgure light on the front.
The DH-200 has one 5 ampere 3AG slow-blow power-input fuse, and 5A 3AG fast-blow fuses on the B+ and B- rails of each of the two power amp modules.
It has speaker fuses to protect your speakers from you doing something stupid. Most amplifiers don't have speaker fuses. Unique to the DH-200, the speaker fuses are inside the feedback loop to maintain high damping factor and null any sonic degradation form the fuses.
Specifications top
Intro Specifications Measurements Compared
Usage Recommendations More
Output Power
Stereo
Less than 0.02% THD at any power level up to 100 watts per channel, both channels driven continuously, from 20-20,000 Hz.
Audio Input
One stereo pair of 1/4" RCA jacks with individual potentiometers.
22 kΩ.
1.5 V RMS input for 100 watts into 8Ω.
Audio Output Connectors
Standard 5-way binding posts on standard 3/4" centers.
Total four pairs or 8 posts.
SMPTE Intermodulation Distortion
< 0.005% from 1 - 100 watts into 8Ω.
THD at 100 WPC into 8Ω (typical)
1 kHz: 0.0015%
10 kHz: 0.005%
20 kHz: 0.012%
Frequency Response into 8Ω
10 - 40,000 Hz at 100 watts ±0.5 dB.
1 - 100,000 Hz at -3 dB at 1 watt.
Crosstalk (typical)
66 dB at 20 Hz.
66 dB at 1 kHz.
60 dB at 20 kHz.
Signal to Noise Ratio
>100 dB unweighted, referred to 100 watts.
Damping Factor
150 at up to 1 kHz into 8Ω.
50 at up to 10 kHz into 8Ω.
Rise Time
2.5 µS from 10% to 90% with a 60 V p-p 10 kHz square wave.
Slew Rate
30 V/µS with a 60 V p-p 10 kHz square wave.
Semiconductors
8 power MOSFETs: two pairs of complementary Hitachi 2SK134 and 2SJ49 lateral MOSFETs per channel.
Each of these power MOSFETs was individually tested, graded and sorted by Hafler. Each was stamped with a number from one to five and assembled accordingly into amplifier modules.
26 transistors.
24 diodes.
4 Zener diodes.
1 bridge rectifier.
Power Input
120 VAC, 60 Hz (US version).
Rated 370 VA maximum, marked 600 W maximum.
Actual power consumption is much less.
Quality
Made in the United States of America (Pennsauken, New Jersey).
Packaging
Corrugated cardboard box.
Amplifier supported by cleverly multiple-folded inner corrugated cardboard insert.
Size
5-1/8 x 16 x 10-1/2 inches, HWD.
Weight
26 pounds (11.8 kg).
30 pounds (13.6 kg) shipping weight.
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Sist endret: 28.11.2019, 07:44 ・ FINN-kode: 163594182