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Luxman L550 Integrated Class A Amp with Phono
Luxman L550
24 aufrufe in diesem monat
Datum des Eintrags 29.04.2025
Letztes Update 29.04.2025 Luxman L550
Luxman L550 Luxman L550 Luxman L550 Luxman L550 Luxman L550 Luxman L550 Luxman L550
Erläuterung Ursprüngliche Beschreibung Englisch, anderssprachige Texte sind Übersetzungen und können Fehler enthalten. EnglischDeutschSpanischTürkisch Recently serviced and in very good condition for the age with a decent built-in phonostage.

Please note this amp is 100v Only and a 500w step down transformer is needed.

First of a very successful line of integrated amplifiers which would receive many awards and sell very well worldwide.

Designed and produced before the Alpine "takeover / collaboration" and just before the DAD revolution, the L-550 did receive a "State of the Art" award in 1982 besides being selected as "Best Product" by Stereo Sound.

Most of the direct followers also became Stereo Sound "Best Product" : L-550X, L-560 and the very successful L-540 and L-570.

All are versions of the same basic circuit : Single-Stage amplification, Duo-ßeta, plus-X, Circuit /S and Class A all the way, real hot Class A.

All did also sport something which was not to be discarded once the fad faded : double Heat-Pipes !

Power supply

Feeding all is a big 400VA EI transformer and two low-ESR 50V / 30,000µF 99,99% pure aluminium chemical caps.

Six windings feed separately the pre-driver, main Duo-ß, phono MM EQ amp, phono MM EQ Duo-ß, phono MC and protection / regulation / muting / pre-heating stages.

The power amp is fed separately from the secondary.

The necessary Heat-Pipes have vents top and bottom of the enclosure : 2x 50W of pure Class A produces heat, especially when idling current is to be set at 160mV for each channel !

The pre-Heating switch is used to get the L-550 reach its cruising speed while the power-on button is off ; current is cut from the final transistors but heats-up the rest of the circuit.

Single-Stage amplifier

As in all contemporary Luxmans, there is no second stage so the 1st stage uses a high Gm low-noise FET (for the MC input) with a 7mA current for the necessary gain.

If Duo-ßeta is used as usual in the power-supply, in the L-550, it also was implemented in the EQ phono section - that's Duo-ßeta Circuit /S.

Line level input reach the circuit where the "phono straight" mode starts, the latter bypassing the subsonic, high-cut, monitor and source selectors.

Unlike other contemporary LUX amps, the 9-turnover NF tone controls are not placed withing the power amp's main Duo-ßeta loop but the Linear Equalizer which can subtly tilt RIAA frequency response is.

The attenuator is a 2-gang 50kOhm pot sourced from, as always and for nearly everybody, ALPS, aka Alpine :)

Other features are... plenty :

Line-Phase sensor, front supplementray phono input, tape i/o and headphones output, three-way tape monitoring, 4-way tape dubbing, 6-position phono setting and warm-up indicator.

Plus pre/main i/o, all engraved front scripting and rosewood enclosure.
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Post-Standort
Norfolk NR35 - United Kingdom

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