—an analog, 2-channel audio analyzer—is a legendary "rare beast" known for its precision in measuring everything from total harmonic distortion (THD+N) to wow and flutter. However, finding a detailed service manual for these vintage units is famously difficult, often leaving owners to rely on community forums and shared PDFs. The Story of the "Fixed" Manual
The old manual tells you to calibrate at 1kHz only. This yields nonlinear readings above 10nF. neutrik a2 service manual fixed