Thought you might be interested to know that after I swopped out my Mullard 5AR4 for the stock Ruby rectifier which my Modwright was supplied with, the frequency balance in my system returned. I then bought a Create 5AR4 (living in Hong Kong, I got it direct from China). From new, I was a bit surprised to hear hardly any difference between the Ruby and the Create. If anything, the Create was a little softer and the Ruby a bit more dynamic. But upon swopping the two to compare, I noticed they look very similar. Further examination confirms it, the base was identical, in colour, material and moulding. And the parts inside the tube also are effectively identical, apart from minor differences due probably to the fact that they are hand assembled? I probably should clarify that I am not saying that Ruby and Create are identical tubes. All I am saying is the two look very similar to each other. Maybe the factory that makes Ruby 5AR4s makes tubes for Create too? I will put some hours on the Create and do another comparison with the Ruby and keep you posted.