Stax SRM1 Mk2 Professional electrostatic headphone amplifier.Normal and Professional bias output. The unit is in very good condition with the odd light mark here and there.Fully functional.

STAX SRM1/mk2 pro amplifier. Some small marks on paint and faceplate (see photos) but really in excellent condition given its age (these were manufactured from 1982 until 1995). I had this one refurbished as one channel didnt work when I bought it. Capacitors were replaced with better ones, along with some other bits and pieces. It now works flawlessly, but has seen little use since refurbishment. This has sat on a shelf unused for the last few years after I upgraded to a STAX T1 amp. I kept it as a spare but have now upgraded again. I dont need 3 STAX amps! This particular version is sometimes called the swiss army knife of STAX headphone amps, because the input voltage is switchable (100 / 117 / 220 / 240v) and it offers both normal and pro bias outputs. As a result it can be used anywhere in the world, and power any STAX headphone - (although it would be underpowered for the SR-007 or SR-009.) That doesnt mean it isnt loud enough to destroy your hearing in minutes at maximum volume with compatible headphones! NB: this will NOT work with dynamic headphones. It is an electrostatic amplifier, for electrostatic headphones (ie: STAX) I also have a very nice pair of STAX headphones (SR-404 signatures) listed and would be negotiable on price to combine the two. Tech. specs: SRM-1 MkII ProType Headphone AmplifierInputs 1 x loop-through line-level input, rated 100 mV, 50 k OhmGain 60 dB (1,000x)Frequency Response Rated DC - 20 kHz, ±1 dB, at 30 V with one pair of SR-LambdaDistortion Rated 0.05% THD at 100 V at 1 kHz while driving an SR-LambdaInternal Wiring Super oxygen-free copper with giant crystalsOutputs 2 x headphone audio (plate) outputs, in parallelOutput Rated 370 V RMS maximum output at 1 kHz.Voltage Rear-panel selectable 100 V, 117 V, 220 V or 240 VFrequency 50 - 60 HzPower Consumption Rated 33 WattsDimensions 5.9W x 3.4H x 14.2DWeight 4.41 lbs. For more detailed information this is a link to Ken Rockwells review of this amplifier:Stax SRM-1/MK-2 Professional Review (1982-1995) (kenrockwell.com) Please feel free to contact seller for more information or photos.