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Objective Audio - 3M Information

Information on bias settings, transformer specifications and more


3M M79 Recommended Bias Settings A place to start for bias alignment.

3M M79 Bias Settings

3M M79 Head Damping Here are the effects of different head damping resistor values on a 3M M79 repro head.

Head Damping

Flux Loop Tests: Using the instructions given on Dale Manguen's website, epoxy, and InstaMorph moldable plastic, I have built flux loops for different sized heads. Shown below is one for a 2-inch 3M M79 head.

Head Damping
Head Damping
Head Damping

3M M79 Tests from 1982 Some interesting information from 1982 using a custom Saki Magnetics head for a 3M M79 1/2-inch 2 track.

Head Damping
Head Damping

3M M79 Input Transformer Specifications 3M Part Number 79059A008.

Input Transformer

3M M79 Output Transformer Specifications 3M Part Number 79059A007.

Output Transformer

3M M79 Isolating Flutter

Isolating Flutter
Isolating Flutter