This Koss E/90 Electrostatic Energizer is a must-have for any vintage audio enthusiast. Designed to work with Koss ESP950 headphones, this energizer delivers exceptional sound quality and performance. The black color and sleek design make it a stylish addition to any collection.

With its electrostatic technology, the Koss E/90 energizer provides a unique listening experience that is sure to impress. Whether you're a music lover or a vintage electronics collector, this energizer is a great addition to any setup. Don't miss out on the opportunity to add this rare and sought-after piece to your collection.great condition previous owner, put a painted line on the knob see pictures