: The YEDS-7 replaced the earlier Type 1 and Type 2 test discs, consolidating their functions into a single reference.
: Measuring the voltage of signals at specific points in the circuit, such as a 1 kHz sine wave at 0 dB. sony test disc yeds7rar
Because it was never intended for general consumer sale, finding an original copy often requires searching specialized secondary markets: : The YEDS-7 replaced the earlier Type 1