Linn LK1 (1989)

The Linn LK1 was introduced in 1989 as the matching preamplifier for Linn's LK2 and LK2-75 power amplifiers. It was part of the company's move toward modular, flexible system building. Linn's own documentation describes it as the last preamplifier the company sold without an integral power supply. The LK1 relies on a separate external unit, though sources conflict on whether that supply was standard equipment, optional, or strictly required. Given the ambiguity, it's safest to say the LK1 was designed around a separate power supply, with an internal option reportedly available.

The control architecture is the well-documented part, and it's unusual. Volume and balance were not handled by a conventional potentiometer. Banks of precision fixed resistors were switched by solid-state devices, a design meant to give stable gain settings without the noise or wear of a mechanical volume pot. The program input buttons select from two high-level sources (tuner and auxiliary), plus either MM or MC phono. The phono stage is a standard MM input that can be switched to MC via an internal jumper. The preamp also offered volume presets for each input, the ability to listen to one source while recording another, a keyboard lock-out to prevent unauthorized changes, and an optional wireless remote that duplicated all front-panel controls. The audio signal path never passes through the front-panel switches. The control signals stay behind the panel, away from the circuitry.

HiFi/Stereo (January 1989, p.58) tested the LK1 alongside the LK280 power amplifier and found the combination an unusual blend of digital-era control sophistication and analog performance. Audio (April 1989, p.100) was more direct in its praise, noting that Linn's stated design objectives of low noise and very high isolation were achieved. The same review observed that, with no tone controls on board, correcting frequency response errors meant hooking in an external equalizer via one of the tape-monitor loops.

Construction was modular and service-friendly. The review noted the LK280's channel modules were easily replaceable units, and the LK1 shared that philosophy. Balanced XLR outputs were fitted as standard (the review mentions high-quality XLR cables supplied), alongside RCA outputs for conventional connection. The unit could be rack-mounted with optional front handles.

Inputs: 4 line + 1 tape, plus MM/MC phono (switchable via internal jumper)
Outputs: 2 pairs RCA + 2 XLR balanced
Gain: 20 dB; max output 14 V
Distortion: < 0.01% THD+N
Frequency range: 5–100 kHz (−3 dB), with subsonic filter
Dimensions: 8.4 × 44.5 × 35.2 cm (H×W×D); 6.0 kg

Original retail price and exact production run are not documented in the available record. The LK1's successor is likewise unnamed in surviving sources. It was the last of Linn's control units to need an outboard supply.