Amps with low gain

You also should have sources over 1K output impedance to match well with these

I believe you mean under, not over, and the lower the better unless you order a special unit from Placette with a higher input impedance like I did.

Samuell, what are you trying to accomplish? What equipment do you have?

Low gain and low sensitivity are basically 2 ways of saying the same thing but I understand what you want. A passive might be the answer. Contact Guy Placette. He is very responsive and won't steer you wrong.

Almost all sources have a fairly low output impedance, solid state ones especially but most tube units are low enough.