Tape Machine Info

Bias Info

These are recommendations only, or at least a starting point.  Some people like to adjust to their liking…

Tape Machine Bias Settings

Head 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:

VactecReplacementInstructions

Vactec-VTL5C1-datasheet

Why you may want to replace your original or later FETs with P1086 FETs:

Input tests:

3MCard-Input-FET-test-2N4343vsP1086vsJumper-V03

Repro tests:

3MCard-Repro-FET-test-2N4343vsP1086vsJumper-1kHz