Hi, and apologies for another capacitor thread. I sit on the skeptic side of the debate but open to being convinced otherwise so I want to do some A/B testing for myself. I have a very flexible prototyping amp chassis that is currently a PP 6V6 with 2 standard-ish gain stages and an LTPI. At the moment its fitted with the cheapest film and electrolytic caps available on AES. No ceramics. So my question is, which one or two capacitor locations in an amp do you believe will have the biggest impact on tone with particular high-end capacitors? I want to install some on switches, do some testing and report back. I have a pair of ears, a cap tester, a scope and a basic spectrum analyzer. I'd like to keep my comparison to just film and electrolytic types.