Herbert Preamp Tubes

I have read all the posts concerning Herbert preamp tubes.....
Just wondering.....has anyone tried Mullard CV4004's in V1, V2, and V3 at the same time?
 
No big differance from the Ruby 12ax7HG+ .
The "High Grade +" might have been a bit more quiet.
Mullard tone was smoother but you can use the amps EQ and Gain to do the same with the Rubys.
 
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