Hafler DH-220A
A conservatively rated workhorse power amp that hit the test bench at 138 watts per channel when it was only asked for 115.
Overview
The DH-220A is the factory-assembled version of Hafler's DH-220 power amplifier. The "A" suffix gives it away. Hafler sold kits and finished units side by side, and the assembled DH-220A carried a real premium for the soldering you didn't have to do. Dealer ads from the mid-eighties put the kit at around $400 and the assembled DH-220A at $500. That hundred-dollar gap bought a three-year warranty on the finished unit and, presumably, a clean conscience about cold joints. Those same ads list an "AE" variant a few dollars higher, and a "KE" kit-with-something version, so Hafler clearly ran a small alphabet of suffixes for rack-mount faces and options. A bronze-finish DH-220A even turned up in a factory closeout at $299.90, with a black rack-mount face available separately for $24.95.
The amplifier itself is the interesting part. Audio (February 1984, p.57) put the DH-220 on the bench and found it conservatively rated. It delivered 138 watts per channel at mid-frequencies before reaching its rated 0.02% THD. At its rated 115 watts per channel into 8-ohm loads with both channels driven, distortion sat at just a fraction of that. An amp that loafs at its rated output and has another 20-odd watts in reserve before it starts to misbehave stays composed driving speakers that dip and swing. The rated 115 W per channel figure is the number to quote, but the measured 138 W is the number that explains why these amps have a reputation for punching above their price.
The same review lays out the lineage. The DH-220 replaced the DH-200, and Audio (July 1983, p.106) framed it as reinforcing David Hafler's commitment to quality across the line. The review also sketches Hafler's background as a former owner of Ortofon, the Danish cartridge house. Collectors tend to treat the DH-220 family as the sweet spot of the Hafler power-amp range: more grunt than the smaller DH-120, less bulk and cost than the DH-500, and a straightforward circuit that a competent hobbyist can actually service.
The DH-220A shows up in period recording-studio package listings too. One Recording Engineer package deal paired it with Fostex tape machines and a Fostex console, so these amps landed in working rooms as well as hi-fi racks, where reliability and clean power mattered more than badge appeal. The three-year warranty on assembled units was a strong statement in an era when a lot of gear came with ninety days. Whether it's a kit-built DH-220 or a factory DH-220A, check the solder work on the kit units, confirm the output stage hasn't been cooked by a hard load, and expect the usual age-related service on the electrolytics.
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