This is a very RARE “Tuned Tube” amplifier made by the Acoustic amplifier company in the late 60s. This actual amplifier has been used on many important recordings including Johnny Cash’e “Unchained” album with John, Tom Petty and Mike Campbell all using this amp. It is a solid state guitar amplifier that is built on a “tube” with two speakers mounted on each end. The combo has adjustable reflector panels on either side to direct the focus of the sound. Strange and wonderful. Enjoy!