Luxman L230 (Late 1980s)
An integrated amplifier from Luxman’s L200 series, known for its Duo-Beta feedback and solid-state power output stage.
Overview
The Luxman L230 is an integrated amplifier produced in the late 1980s as part of the L200 series. Built by Luxman (Alpine), it combines a phono stage for MC and MM cartridges with a fully symmetric bipolar transistor output stage. Designed for high-quality audio performance at an accessible price point, it was noted for its distinctive tone control placement within the power amp's feedback loop and its use of Duo-Beta feedback technology. The unit follows a single PCB construction policy, with power transistors directly soldered to the main board.
Specifications
| Power output | 30 watts per channel into 8Ω (stereo) |
| Frequency response | 20Hz to 20kHz |
| Total harmonic distortion | 0.05% |
| Input sensitivity | 2.5mV (MM), 150mV (line) |
| Signal to noise ratio | 70dB (MM), 90dB (line) |
| Output | 4V (Pre out) |
| Speaker load impedance | 4Ω to 16Ω |
| Semiconductors | 2 x IC, 26 x transistors, 16 x diodes |
| Technology/Features | incorporates Duo-Beta feedback |
| Technology/Features | tone control is in the feedback line of the power amp; no traditional tone amp |
| Construction | single pcb policy; power transistors directly soldered to main pcb |
| Phono stage | common IC grade MC & MM/MD pick-up amp |
| Protection | The protection circuits are rather simple |
| Output stage | fully symmetric and complementary bipolar transistor power output with high speed & high current plastic power transistors |
| Power supply capacitors | C134, C135 of 10000 uF |
| Dimensions (W x H x D) | 438 x 140 x 320mm |
| Weight | 9.0kg |
Design
The L230 uses a single PCB layout with power transistors directly soldered to the board, a design choice that simplifies construction but may contribute to thermal stress. Its tone control is uniquely placed in the feedback line of the power amplifier rather than using a conventional preamp stage. The amplifier incorporates Duo-Beta feedback and features a fully symmetric bipolar transistor output stage using high-speed, high-current plastic power transistors. The power transformer is larger than that used in the L200 model, and most L200 series amplifiers share the same power rail voltages.
Context
Positioned as an affordable yet high-quality amplifier, the L230 was part of Luxman’s L200 series, which gained a reputation for outstanding sound quality and build. These components became legendary among audiophiles for their excellent audio performance. Some models in the series lack an MC/MM switch and feature only one front panel lamp, though it is not specified whether the L230 has these traits.
Market
Common issues include a vulnerable muting circuit, incorrect capacitor ratings (such as 35V caps on a 46V rail), and potential PCB damage due to flawed original power design. Some units were improperly repaired with incorrect replacement transistors like BD249/BD250 instead of the original 2SA1263/2SC3181. Recommended maintenance includes replacing numerous capacitors, particularly C118 at the power-amp input. Modifications include upgrading front panel lamps to LEDs, separating power supply rails per channel, and bypassing front panel speaker switches. Replacement transistors such as 2SA1694 and 2SC4467 from Sanken have been used successfully.
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