Bias Info
These are recommendations only, or at least a starting point. Some people like to adjust to their liking…
Tape Machine Bias SettingsHead info for 3M M79 1/2″ 2 track
3M M79 transformer info
Isolating wow & flutter info
Option to replace bad Vactec in 3M M79 Signal Electronics bias circuit:
Vactec-VTL5C1-datasheetWhy you may want to replace your original or later FETs with P1086 FETs:
Input tests:
3MCard-Input-FET-test-2N4343vsP1086vsJumper-V03Repro tests:
3MCard-Repro-FET-test-2N4343vsP1086vsJumper-1kHz