Tube info

These are all excellent suggestions. Anyone have any input on NOS Sylvania Baldwin Long Gray Plates?

Did I not call the tube the correct name? I referenced what I thought was called the driver tube. That’s what I always called it and the other tube is the rectifier? My understanding is the tube other than the rectifier has maximum sonic benefits. Is this correct?

What is the make and model of your amp so we can Google it.

Mullard CV4003 from Upscale Audio. My favorite 12AU7 and variant...

https://www.upscaleaudio.com/products/mullard-cv4003-12au7-vintage-new-old-stock?variant=22618913669

I have several amps that take 12AU7s my list is as follows
1: Amperex Bugle Boy ( super detailed)
2: Amperex (Long Plate Large D Getter)
3: Mullards (blackburn factory)
4: NOS Vintage RCA Clear top