Tube info

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

What is your budget?

The Amperex 7316 is my personal favorite, but pricey.

I also like the RFT 12AU7.

On the domestic side the black-plate 5814s are an excellent value.