Luxman R-107 (1975)
An analog FM/AM tuner from Luxman, built for precise tuning.
Overview
The Luxman R-107 is an analog FM/AM tuner released in 1975 by Luxman Co., Ltd. of Japan. It came out during the transition from tube to solid-state audio. It covers FM (87.5-108 MHz), medium wave (530-1600 kHz), and shortwave (2.3-22 MHz), so it handles both international and domestic broadcasts. Tuning is continuous and analog, through a dual-gang variable capacitor and a large, easy-to-read analog dial with an illuminated pointer. The chassis is heavy-duty and weighs 10.5 kg, which keeps down microphonic effects and vibration. The faceplate comes in black or silver, with brushed aluminum trim.
Design
The R-107 is a dual conversion superheterodyne design. The first and second IF frequencies are 10.7 MHz and 450 kHz, which improves image rejection and selectivity - handy in crowded urban RF environments. The audio path has no integrated circuits. It uses discrete transistors and carefully selected passive components to keep the signal clean. The tuning system is built around a high-quality dual-gang variable capacitor for accurate, stable reception. The front panel has a meter-style tuning indicator.
Reception and Use
The R-107 has a warm, detailed sound, with excellent stereo imaging and channel separation on FM. Vocals and acoustic instruments come across with lifelike presence, and the spatial depth of live broadcasts is preserved. Stereophile (December 1976, p.58) noted that "Luxman tuners of this generation reveal a tonal completeness and low-level resolution that make FM listening not just informative, but musically satisfying." On AM, the well-designed IF stages and filtering reduce noise, so even voice programming is listenable. The shortwave band adds use for international broadcasters and hobbyists.
Market
In good working condition, the R-107 typically sells for $400 - $700 USD. Fully serviced units and original accessories bring higher prices. Silver-finish models are slightly rarer and may carry a small premium. Common problems are deteriorated electrolytic capacitors (which can cause hum or channel imbalance), oxidation on the tuning capacitor (leading to scratchiness), and worn potentiometers. Most of these can be fixed with recapping, contact cleaner, or NOS replacements. The all-analog, through-hole construction makes it relatively easy to service compared to later digital models.
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