​​Original vintage ad for ACOUSTIC TECHNOLOGY LABORATORIES.  Acoustech I listened to by Anton Schmitt of New York's famed Harvey Radio Corporation.  I heard things I never heard before.  The expensive all-silicon output stage combined with direct-coupled circuitry provides unequaled transient response.
Main office was located at 139 Main Street, Cambridge, MA.
This unique old one page 1963 high fidelity stereo component trade magazine advertisement would display beautifully matted and framed.  It would make a nice accompaniment to your vintage stereo.