My tube rolling experience with preamps tells me that you can get these types of effect from different tubes. Does the same thing hold true for tube amp 6922 driver tubes?You've just put your finger on exactly the problem with using 6922/6DJ8s in amplifiers. Its hard to find a good one! The tube is very prone to microphonics and harsh sound. The Russian tubes IMO made this problem even worse.
Currently, there are Electro Harmonix tubes in the two driver positions and a Sovtek Reflector in the input/phase splitter position. I know I do not like Electro Harmonix in my CJ preamp.
Wonder would happen if I changed out the Electro Harmonix tubes?
Yes, if you have decent tubes the sound of the amp will change quite a lot. I've personally had terrible luck with the EH 6922. IMO, its pretty easy to find better sounding tubes than any of the Russian-made miniature tubes- 12AX7, 12AU7, 6922 and so on. Its not surprising at all to hear that a microphonic 6922 is causing silibance!!