Arfa Daily wrote:

A few weeks ago, I was looking for a schematic for a PA amp, and called it a
"head" on here. I got told that it wasn't a head, because it had a preamp in
it, and a head has only line level inputs.

No, a head has instrument level inputs.

A PA amp has line level inputs if professional, or could be anything down to mic
level if a mixer/amp.

Basically a 'head' usually lives on top of a speaker stack, often behind a
guitarist.

Graham