Ampex ATR-100

It was introduced at the Spring 1976 AES Conference in Los Angeles,[1] and was geared towards the ultra high end studio market.

The original versions were designed specifically as a stereo or quadraphonic (2 or 4 track) mixdown and mastering deck.

[2][3] Key features of the design are the machine's interchangeable headblock system, which allows the ATR-100 to be converted to run either quarter-inch or half-inch magnetic tape.

In 2005, the ATR-102 was inducted into the TECnology Hall of Fame, an honor given to "products and innovations that have had an enduring impact on the development of audio technology.

With additional components and customizations, either machine could easily reach over $100,000 in cost when it was originally released.