Buy 12ax7 tube

OP... CEI was a distributor that sold quality tubes made by other manufacturers. 

Zaerix relabeled other manufacturers' tubes. I found a couple in used components.
https://www.18watt.com/viewtopic.php?t=23510

Buying tubes for $20 without etched factory codes or test results is a shot in the dark. Even if it sounds good, it may not last long. And with rebadged tubes and no description, you won't know their sonic signature.  
My advice, spend some money and buy from a reputable dealer who posts tube measurements and offers exchanges. There are many good NOS tubes for $50.

Is it rca?

https://drive.google.com/file/d/1SVg-jJ7my4F9PCkwg43CtHwjm4B_x2n8/view?usp=drivesdk

@bimasta, I love NOS Tung-Sol AU12's. I find them to have tonal purity, good extension, and a slight but pleasant tube bloom. 

A 7025 RCA is a premium low noise tube. I believe it's the equivalent of an RCA longplate. 
Don't know anything about the Canadian factory.

I bought the white label 7025a rca and my system sound better now😍
Next step is a good usb cable and make an furutech rca cable with raw cables!