Audio Aero Capitole 192 MK II se upgrade

Normally AA uses Jan Philips 6021W.
What cryo tube is used in SE upgrade (Philips, Sylvania) ?
I have emailed Globe Marketing recently they do not respond.

I have contacted France Audio Aero too, but they did not bother to respond. I'm out of luck trying to find Sylwania 6021W, But I have found Raytheon 6021W. Have anybody compared different brands of 6021W, is really Sylvania's the best one ?

So you actually have not heard big difference between regular tubes and cryo ones.
Some AA owners claim that difference is huge after applying SE upgrade, but it may be VCAPs not tubes, who knows. Do I believe in cryo treatment, not yet, curious it will not hurt to try. I will have piece of mind 
I have already ordered CuTF VCAPs, I like the way AA Cap mkII sounds in midrange, but I would like to have more resolution and speed.
I have asked Tube World about differences between Sylvania’s and Raytheon but they would not comment. Since they are out off Sylvania’s I guess they will not recommend them and will not criticize tubes they have in stock.

I have upgraded the Musicap to VCap CuTF and there was tremendous progress in terms of transparency and resolution.
It is so much better player now. Importunately I have latter upgraded Philips 6021W to cryo Sylvania 6021W and I have lost bass impact and dynamic.
Did anybody tried Sylvania's instead of Philis and noticed loss ob bass impact after upgrade ?
Is AA using Sylvania in their players at all ?