Of course you know about trying different phase inverter tubes. The standard Fender ‘Blackface’ phase inverter is a 12AT7. A 12AX7 will give more drive, and a 12AU7 will give less drive. Sometimes across the phase inverter plates will be seen either a 47pF or a 100pF ‘snubbing’ capacitor, that we were introduced to earlier.
I got a good vault of information last time I asked about new tubes for my Tweaker,
but I still don't understand the FIRST thing about a PI tube.
I read an article by Myles Rose about it, as well as tons of info on other forums, but the information around seems to be more for engineers than for ignorant guitar players like myself.
What does it do to the sound, and for what reason would I want a low or high gain tube in here??
Some guys like the 5751 tubes better, others the 12at7, and others stick to some good ol' ax7.
Some say lower gain tubes like the at7 are better here. Why?
What to do here? I really don't understand the first thing and there's too much COMPLEX information out there.
I'd just like to understand what to choose with tone being the first consideration.