Hafler DH-100
A preamp that sold in kit form for the price of a decent cartridge - and became the gateway drug for a generation of tinkerers.
Overview
The DH-100 was Hafler's entry-level preamplifier. In the late 1980s, mail-order houses were advertising the kit at around $175 and the factory-assembled version at roughly $225. Audio (December 1986, p.159) listed the DH-100K at $175 and the DH-100A at $225 in its dealer pages. The numbers crept up after that. Oxford Audio Consultants was quoting $200 for the kit and $250 assembled in early 1988, and by mid-1988 the same dealer had moved to $225 and $275 respectively. This was a preamp aimed at the budget-conscious hobbyist, and it stayed there.
Hafler sold the DH-100 as a kit - a bag of parts, a circuit board, and a manual - for people who wanted to understand what they were listening to. The assembled version existed for those who'd rather listen than solder. The savings on the kit were real: fifty dollars or so off the assembled price, depending on the year and the dealer.
The DH-100 sat at the bottom of a preamp lineup that included the DH-101 and DH-110 above it. It was the entry point, the one you bought when the DH-101 was just out of reach. It was built well enough that the aftermarket took it seriously. Musical Concepts, a Missouri outfit that specialized in hot-rodding Hafler gear, offered a full suite of modifications for the DH-100, including their M-100SX board and a Teflon circuit retrofit. When a budget preamp attracts that kind of third-party attention, it usually means the basic architecture was sound.
The kit and assembled versions carried different warranties. Dealers advertising the line in 1988 noted a three-year warranty on assembled units - the ones without the "K" suffix. Hafler stood behind its factory work, but couldn't quite extend that to the customer's soldering iron.
According to the dealers and modifiers who supported it, the DH-100 delivered a clean, low-impedance power supply in a package that didn't cost much. Musical Concepts' marketing claimed their SuperMod series for the DH-100, DH-101, and DH-110 represented "the highest price performance ratio" in their lineup. That's a modifier's sales pitch rather than an independent verdict, but the DH-100 was included in that group. The low-impedance supply was the foundation, and the modifications built on it.
The DH-100's place in the used market has always been modest. A 1988 classified in Audio listed a used DH-100 at $159 and a DH-102 at $20. By 1990, a "updated" DH-100 was being offered at $195 by a Pennsylvania dealer, so even then the modified versions commanded a premium. These aren't collector-grade prices, and they never were. The DH-100 was a working component, bought to be used, and most of them were used hard.
The DH-100 is a budget preamp that Hafler designed properly and the aftermarket kept alive. It's not rare, and it won't impress anyone who judges gear by its faceplate. It is also a platform for a Musical Concepts build. Don't expect the kit version to come with a warranty, and don't expect the assembled one to have survived forty years without at least one recap.
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