Studer A810, Page 3
Studer A820 1/4-inch master tape recorder (Biased for 911)
Nagravox Calibration kits are different to what you might expect. A lot more than just a calibration tape! Developed over the last 3 years
Setup Calibration Kit for Revox A700
How was analog recording done in the 80s? - Quora
Technical Info — ATR Magnetics
Phantom Productions reel to reel tape recorder 1908 ad collection
Nagravox Calibration kits are different to what you might expect. A lot more than just a calibration tape! Developed over the last 3 years
GENERIC Setup Calibration Kit for most 'other' tape machines
Reel-to-Reel Tape Recorders, Vintage Audio & Video, Vintage Electronics, Electronics - PicClick AU
Technical Info — ATR Magnetics
Studer A820 1/4-inch master tape recorder (Biased for 911)