HAFLER DH-200 STEREO POWER AMPLIFIER As can be seen from the photos, this unit is for parts or repair---hoping to pass it along to someone that can either use parts from it for their amp(s), or who feels up to the challenge of getting it up and running again---I have no idea as to what the history of this amp is, as far as past operating condition---I found it just as it is, and what you see is what you get, just as seen in the photos. Payment must be received within 24 hours of end of listing. Will ship via FedEx within one business day of completed payment, very well packed and fully insured. Guaranteed to be as shown in the photos and as stated in the description, but thats it, no other guarantees or warranties whatsoever--this amplifier is being sold as-is, for parts or repair. Any questions at all, please just ask...thanks!

Audio by Van Alstine Omega III 250 based on Hafler DH 200. This is a later version of the complete rebuild by Audio By Van Alstine. I have recapped the unit with the exception of two non polar caps. The grounding scheme has been redone using a five lug terminal strip. Fewer wires thus go to the ground buss wire between the two big caps, a source of hum. The big 10,000 mfd caps are from Dynaco Dan. Smaller caps are Nichicon, 10 caps were replaced. The case looks good from the front, there is some old shipping damage on the back of the fins on one side, some damage to the same side bottom of the case. The bottom damage was (mostly) flattened with some wood blocks and a big screw clamp. I had this in my system for several weeks, very impressive amp which deserves the best preamp, speakers and sources. This sale is the the lower 48 states only. I will not sell or ship overseas. I have a heavy duty double box for the item, the fins will be protected with cardboard surrounds. The amp will be bubble wrapped and tight in the box but with flexible packing materials. On Sep-07-23 at 04:56:46 PDT, seller added the following information: Added note: Bidders should be aware that the amp produces a low-volume zing sound through one channel on shut down. This is common to other AVA conversions of this amp. Recapping did not eliminate this quirk. The B+ and B- voltages are 61 volts, zero DC at loudspeaker terminals. I left it on all the time. The power cord has been replaced with a much larger polarized version.

David Hafler DH-200 Amplifier / Endstufe Zustand gut, siehe Fotos. Maße ca. 45,5 cm breit, ca. 25 cm tief, ca. 13 cm hochGewicht ca. 12,44 kg Wir bieten nur das an, was auf den Bildern zu sehen ist. Ihr Team von Die FAIRwerter Bei jeglichen Fragen oder Anliegen bitten wir Sie, auf uns zu zukommen.Wir werden zeitnah auf ihr Anliegen reagieren. Bitte wenden Sie sich bei Versandschäden schnellstmöglich an das entsprechende Versandunternehmen.

Legendäre MosFet Endstufe des Dynaco Gründers David Hafler. Kompakt und leistungsstark, sowie impedanzstabil. Das amerikanische Gegenstück zur Quad 405...ein Klassiker der Hifi Geschichte mit Leistung & gutem Klang. Sehr guter Zustand. 220/240Volt Version. (Auch noch XL-280 & Dynacos da!) Technik: 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 k?. 1.5 V RMS input for 100 watts into 8?. 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 8?. THD at 100 WPC into 8? (typical) 1 kHz: 0.0015% 10 kHz: 0.005% 20 kHz: 0.012% Frequency Response into 8? 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 8?. 50 at up to 10 kHz into 8?. 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 220/240Volt. Quality Made in the United States of America (Pennsauken, New Jersey). Size 5-1/8 x 16 x 10-1/2 inches, HWD. Weight 26 pounds (11.8 kg).

Recapped with 105C capacitors, nichicon muse for the input capacitors There is a 100uf buffer capacitor for the power rails, right at the MOSFET output devices themselves. This is good, as the original design has the rails fused, and then the rail voltage goes to the MOSFET devices.This layout causes odd harmonic distortion to spike as the fuse element fluctuates dynamically (all odd order harmonics when fuse elements are in use) , and then the feedback circuit is constantly compensating for this. This is bad. very bad. It makes for false gritty high frequencies and detail, due to the constant micro correction of odd harmonics by said feedback network. TRo fix that, or mitigate it tremendously, I put those 100uf, 100V capacitors right at the output devices themselves. Youll see them right behind the circuit boards, between the circuit board and the Heat sinks. the rest of the capacitors are 105C capacitors are are, of course, orignal uf values. the main power supply capacitors come from a low hour but dead Panasonic Ramsa wp-9220 200 watt per channel power amp, which had tremendous current drive, relatively speaking. These capacitors are probably Elnas best and are probably from their own audiophile range of capacitors. They are totally non magnetic, indicating that they tried their best to make their best capacitors, for audio. These capacitors (measured) have tremendous current capacity, and very low internal impedance. They measure the full rated 20,000uf each, which is actually kind of unusual, of youve ever spent time measuring capacitors. Some amount lower than spec is what is normal, even for brand new capacitors. For used capacitors to measure that crazy good, is unusual. So, not just some stock upgrade, but a high quality audiophile upgrade. This high uf measurement also means they have lots of life left in them. the originals were down below 4500uf each (rated 10,000uf), and were dried completely out. I painted the top and you can see where the label was taped over and then the paint around it. It had a little rust...so I cleaned that up with a light spraying. lots of dust so no white specks, actually. Photo makes it look that way. This is a nice sounding amp. Plug and play.

untested unfortunately it has light surface rust but honestly that bad please ask any questions before purchasing thank you for your interest

HAFLER DH-200 POWER AMPLIFIER VINTAGE AMPLIFIER - FREE SHIPPING We are pleased to offer this Hafler DH-200 Power Amplifier. It is in good pre-owned condition showing some cosmetic wear. It has not been used in quite a while, but it was in good working order at that time. Listing and template services provided by inkFrog

Vintage Hafler DH-200 Stereo Power Amplifier -Made In USAExcellent Condition Power output: 100 watts per channel into 8? (stereo) Frequency response: 10Hz to 40kHz Total harmonic distortion: 0.012% Damping factor: 50 Input sensitivity: 1.5V Signal to noise ratio: 100dB Normal 0 false false false EN-US X-NONE X-NONE Attention: We Ship UPS, USPS and depending on the item. Please, always view pics closely before bidding ! We are a reputable Stereo Store with 45 years experience. Professionally Serviced, Cleaned and Tested by our Technicians. All items are shipped fully Insured. World Class packaging guaranteed to arrive as shown in the pictures. Lower 48 States only Please.

the amp looks really nice, no major flaws missing one foot missing screws for top cover does not power on, fuse is blown SOLD AS IS FOR PARTS OR REPAIR +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++POLICY AND FAQ thank you for visiting SUPER-AS-IS items are only tested at the most basic level: plug in power on maybe perform basic functions if there is an obvious issue or problem it will be noted but DO NOT ASSUME you are getting something that is not listed shipping price is determined by size weight and your location please consider the shipping fees listed as part of your bid price I take great care in packing these items. 100% positive feedback because I care about safe shipping...what you see is what will arrive at your door FAQ: does the item work? refer to photos and description what comes with the item? refer to photos and description does the units special feature flux capacitance work? I do not know: refer to photos and description can you discount shipping? no can I pick this up in person? yes NO REFUNDS NO BUYERS REMORSE NO RETURNS for any reason unless lost or damaged in shipping. on a lighter note: all buyers have been very happy with purchases from SUPER-AS-IS. Overwhelming record breaking happiness is yours to be found here, at SUPER-AS-IS.

Vintage Hafler DH-200 Stereo Power Amplifier -Made In USAExcellent Condition Power output: 100 watts per channel into 8? (stereo) Frequency response: 10Hz to 40kHz Total harmonic distortion: 0.012% Damping factor: 50 Input sensitivity: 1.5V Signal to noise ratio: 100dB Normal 0 false false false EN-US X-NONE X-NONE Attention: We Ship UPS, USPS and depending on the item. Please, always view pics closely before bidding ! We are a reputable Stereo Store with 45 years experience. Professionally Serviced, Cleaned and Tested by our Technicians. All items are shipped fully Insured. World Class packaging guaranteed to arrive as shown in the pictures. Lower 48 States only Please.

This auction is for the DH101 HaflerPre-Amplifier and DH200 Hafler Amplifier. (2 pieces) Both working beautifully with minor wear as per photos. Thesewereone of David Haflersflagship models. Awesome machine for the vintage audiophile. Selling due to moving.

hafler amplifier. 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! This amp was upgraded in 2021 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. 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. 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 Audio Input One stereo pair of 1/4 RCA jacks with individual potentiometers. 22 k?. 1.5 V RMS input for 100 watts into 8?. Audio Output Connectors Standard 5-way binding posts on standard 3/4 centers. Total four pairs or 8 posts. 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.