Stax SRD-7 Adapter for Ear Speaker - Electrostatic Headphone Amplifier In Box

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General:
Vintage headphone amplifier from Japanese maker Stax.

These are speaker level which means you connect them to your amplifier output.

Coming to you in its original box.

This unit is rated for 100V but should work fine at 120V. Or you can use a step-up transformer.

More on the SRD-7 from Mike at Headfonia Quality Audio Reviews:
The Stax SRD-7 energizer works differently than a regular Stax amplifier. It requires to be piggy-backed to a standard speaker amplifier, where it takes the current from the speaker amplifier and convert it to the necessary high voltage power for driving Stax Electrostatic headphones.

It remains a popular choice among Stax users as a cheaper alternative than a standard electrostatic amplifiers. 2nd hand units sells for roughly $200 and less, and it runs great out of any vintage stereo receivers.

The SRD-7 pictured here is a normal bias version, where both headphone out has the 6-pin normal bias Stax connectors. There are also pro-bias SRD-7s that accomodates the higher bias Pro-version Stax headphones. The unit itself is fairly small, measuring roughly 12cm x 7cm x 20cm, and it easily finds place next to your computer.

The front panel has a knob for turning power on and off. When the knob is on the off position, the signal from your speaker amplifier is passed on to the speakers, thus you conveniently can switch between your headphone and speaker set up.

On the back panel, we find two cables as well as four binding posts for connecting your speakers. The black cable is the AC Power cable, where the gray cable goes into your speaker amplifier. Conveniently, Stax included the cabling legend for connecting the SRD-7 to your speaker amplifier. Power consumption is surprisingly low at 0.1w.

Brand Background:
Stax has been making the worlds best electrostatic headphones since 1959

Ownership:
Single Owner

Connections:
Speaker level inputs. Stax headphone output. Power Cable,

General Sound:
Smooth, uncolored, undistorted natural and clean

Cosmetic Condition:
7/10 = Good. One or two minor scratches. Well Maintained.. See our detailed rating description here.

Working Condition:
Working perfectly and tested in our lab.

Included:
Just the unit and power cord.

Reviews:
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