Hafler DH-105

A twenty-five dollar sheet of metal that made every Hafler kit builder's bench look finished.

Overview

The DH-105 is not a preamplifier, an amplifier, or anything that passes a signal. It is a cabinet. Hafler sold it separately so that a builder's DH-101 preamp, assembled as a bare kit chassis, could be dressed in something that belonged in a rack rather than on a workbench. In the pages of Audio magazine during the early 1980s, mail-order houses like Oxford Audio Consultants listed it plainly among the Hafler accessories: "DH-105 cabinet," or in some issues "DH-105 preamp cabinet," alongside the DH-103 black knobs and the DH-104 rack mount. The price was usually $24.95. One 1980 Oxford ad shows it at $24.05, likely a typo, possibly a sale.

What the DH-105 did was simple. Hafler's business was built on kits, and a kit builder's finished preamp was a chassis full of parts - functional, but not furniture. The DH-105 gave that chassis a proper enclosure, and the DH-104 rack mount gave it ears for a standard rack. Together they turned a DIY project into a component. Collectors who have handled both note that the cabinet and the rack mount were complementary rather than alternatives: the cabinet housed the preamp, the rack mount let it live in a rack. The DH-105 never gets photographed, which is why it's now hard to find intact.

Audio (February 1981, p.75) listed the DH-105 at $24.95 in a dealer's stock sheet for Hafler products, and the same price recurs across the 1980–1982 run of mail-order ads in the same publication. That consistency is the closest thing to a firm specification the accessory has: a stable, low price across several years of dealer listings, with occasional drift in the printed figure that most collectors attribute to typesetting rather than to any change in the product.

What It Actually Is

Owners and builders describe the DH-105 as the enclosure for the DH-101 preamp, Hafler's kit preamp, sold as the DH-101K in kit form and the DH-101A factory-assembled. The cabinet was sold separately because the kit chassis was sold without one. The factory-assembled version arrived in its own case. The DH-105 was the upgrade path for the kit builder who wanted the finished look, and the DH-104 rack mount was the upgrade path for the builder who wanted the preamp in a rack.

The DH-105 also appears in Hafler's accessory lineup alongside the DH-103 (black knobs) and the DH-106 (a modification kit for early DH-101s built before May 1979). Hafler sold the preamp, then sold the parts that made the preamp better, prettier, or more rack-friendly. The DH-105 was the "prettier" entry. It is the least discussed of the group today. It's a metal box, not a circuit.

Collectibility and the State of the Market

The DH-105 is hard to value because it is almost never sold on its own. Collectors report finding them attached to DH-101 preamps, occasionally with the DH-104 rack mount already fitted, and rarely as a standalone item. When they do surface, they command very little, about the price of a small enclosure.

The practical concern for anyone buying a DH-101 kit today is that the cabinet is often missing, and Hafler no longer makes a replacement. A DH-105 without its original hardware - the screws, the feet, the rear panel cutouts - is a project in itself. Buyers should check that the cabinet matches the preamp's chassis depth, since the DH-101 went through revisions and the enclosure was sized for the version Hafler was shipping at the time. The DH-104 rack mount is a separate item and does not substitute for the cabinet. Owners who want both need both.

The DH-105 is the difference between a working DH-101 and a finished one, and it is the part of the Hafler system that most often goes missing.