Mesa Boogie M-190 Differential Feedback Tube Amplifier. 1982

[blearyeyes]

Mesa Boogie M-190
Anybody familiar with this power amp?

What is differential feedback?


Thanks.

[blearyeyes]

Nevermind....

[Jazz P Bass]

So what is 'differential feedback'?
If you have found the answer, that is.

[blearyeyes]

So what is 'differential feedback'?
If you have found the answer, that is.

A fully differential amplifier, usually referred to as an 'FDA' for brevity, is a DC-coupled high-gain electronic voltage amplifier with differential inputs and differential outputs. In its ordinary usage, the output of the FDA is controlled by two feedback paths which, because of the amplifier's high gain, almost completely determines the output voltage for any given input.

[Steve Conner]

I think it simply means the amp is balanced throughout with two feedback paths. Then again it could mean almost anything, as audio companies love to stick random buzzwords on their products.

[blearyeyes]

That is what I got out of it as well.

[km6xz]

It usually means there are two two feedback paths with different bandpasses. One for audio and the other with a bandwidth(lowpass filter) of less than the lowest freq. of
audio passband. That is required for Dc balance in a direct coupled circuit. Any way, that is what it has regardles of their terms.

[blearyeyes]

Thanks,

that makes sense.