This very compact model continued the now familiar concept of the high quality miniature tape recorder. As well as having counter-rotating flywheels and a servo controlled motor, the TC-40 was unusual in having most of its audio stages on built a single integrated circuit (silicon chip), which represented advanced technology at the time. Other similar models (e.g. the TC-55) still used a number of separate transistors to perform this function. Text copyright © Walkman Central. Unauthorised reproduction prohibited.