.....=12AX7A (default), ECC83 and 7025....
I guess I will learn something...
I THOUGHT:
What is the difference between a 12AX7 and a 12AX7A?
The "A" means "low noise"?
What is the difference between a 12AX7 and 7025?
I thought this was a military grade number inferring tighter tolerances?
I kinda thought then a 12ax7a was pretty much a 7025...
Anyone know about this?...and why preamp tubes are labeled as such?