Hafler DH-101AP
A factory-wired version of the preamp that made the kit world take notice, priced against the assembled competition.
Overview
The DH-101AP is the fully assembled, factory-wired and tested version of the DH-101 preamp. It was the most expensive of the three DH-101 variants dealers stocked. The kit was the entry point and the "A" was a middle step. The AP carried the premium, listing at $399.95 in dealer advertising that ran through the early 1980s. So the DH-101 was not simply a budget kit. Its finished form was priced as a serious component.
Period dealer listings show the pricing ladder clearly. Oxford Audio Consultants, a frequent Hafler stockist, advertised the line as DH-101K at $199.95, DH-101A at $299.95, and DH-101AP at $399.95 - a clean $100 step between each tier. That same $399.95 figure appears in Audio (February 1982, p.73) and again in Audio (April 1980, p.105), where the AP was listed alongside the kit and the A. Old magazine stock pages quote the AP at that price consistently across the early part of the decade, which suggests it held its place in the lineup and was not a short-lived variant.
The AP designation bought assembly and testing at the factory instead of on the buyer's bench. The kit required soldering and alignment. The AP arrived ready to plug in. Plenty of people have built a DH-101 from a box of parts, and skipping that work has obvious appeal, though it cost double the kit price. The market supported it anyway. Dealers kept the AP in stock and advertised it as a distinct product.
Hafler also offered a modification path for early DH-101 units. Oxford advertised a DH-106 "mod kit for 101's produced before May, 1979" at $19.95, and a separate OACH-1 precision-component modification at $50 that was described as a 106-type mod using tighter parts. A low-frequency phono mod, OACH-2, ran $22, or $62 bundled with the OACH-1. Anyone buying a used DH-101AP should know about these updates. A unit with the mod applied differs from a stock one, and the update is not always obvious from the outside.
Hafler sold the DH-101AP through a network of specialist dealers and mail-order houses rather than big-box retail. Oxford Audio Consultants, The Audible Difference, and Read Bros. Stereo ran standing ads in the audio press, quoting Hafler prices and promising free shipping. The AP was a staple of those listings. The advertising record gives a fairly reliable paper trail for pricing and availability that the manufacturer's own catalogs sometimes lack.
The DH-101AP is the least common of the three DH-101 variants, because fewer people paid the premium for factory assembly when the kit was half the price. That scarcity cuts both ways. An AP in good condition is a more interesting find than a kit-built example, but the premium over a clean kit is not enormous, and the electronics inside are the same. Buyers should verify that a unit sold as an AP really is factory-wired. The difference is in the assembly, not the circuit, and a well-built kit can be hard to tell apart from a factory unit without documentation.
Similar items on eBay
No exact Hafler DH-101AP listings are live right now — these searches show current Hafler and similar vintage audio gear on eBay:
As an eBay Partner, we earn from qualifying purchases. This helps support our independent vintage technology research.