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Sold by ourselves some years ago, in great condition.

Recently traded in and boxed, in excellent condition. This unit has just been fitted with a new regenerator board as a precaution and enable trouble free operation for many years to come.

Recently traded in and in good condition. Complete with original box.

This item is being sold on behalf of a local clent who's partner has sadly passed, it is in great condition with only a few surface marks. It doesn't however have any of the original ppacking. Collection would be preffered due to it's weight although we do travel the country frequently so worth having a chat in case we can arrange something.

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STAX introduces a new semiconductor driver unit SRM-400S, the successor model of the SRM-353X. STAX custom-made low noise DUAL FET is installed on First Stage. And FET is also installed on Last Stage. The characteristics of right FET and left FET are measured strictly. Selected FET are installed as well as SRM-700S. SRM-400S succeeds to the design and the manufacturing method of the high end model SRM-700S, the amplifier which FET are installed in all stages.

The SRM-500T, which follows the numerical sequence of the SRM-700 series, is the successor model to the vacuum tube driver unit SRM-006tS and is 11 years in the making.

STAX custom-made low-noise DUAL FET is used for the first stage, and high-voltage double triode 6FQ7 / 6CG7 is used for the output stage. While following the traditional circuit design which is perfect for  STAX vacuum tube drivers, we have improved the efficiency of the power supply and  further improved the sound quality.

What is the ideal electrostatic earspeakers? A fixed electrode which reduces air resistance and the effect of reflection. This electrode also has the high sound transparency. This vision was already found in the metal-mesh electrode of SR-X, which was released in 1970. After that, STAX challenged to realize metal-mesh electrodes for SR-Ω in 90’s again. However, the big metal-mesh electrode was difficult to manufacture. So, the mass production was extremely difficult. This is why SR-Ω was produced in small quantities even though this product has high quality sound.

Multilayer fixed electrode MLER (Multi-Layer-Elect-Rords) established with SR-009 has evolved to MLER 2. The finish and etching process that smoothes the edge of the electrode opening reduces air resistance and further improves sound permeability. Also, the electrodes themselves are gold plated with high specific gravity to minimize the resonance of the ultra-thin electrode. At the same time, due to the effect of reducing the electric resistance of the electrode itself by gold plating, we have opened up a new ground for high speed, clarity, silky details, and powerful texture.

The L300 uses a top quality sound element featuring tough fixed electrodes machined through stainless photo etching has also been employed for the SR-L300. Thus rich deep bass-response, delicate high frequency and soothing mid-range have been realized in a balanced manner.