JOMAN
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That’s a tough question to answer as all the tubes make a difference. Really, the question is which one first?
Based on my experience I would say the rectifier, as the rectifier can effect all the other tubes far more than I realized when I first started and finally learned or realized this with the last rectifier that I tried.
Yes the input tube will make quite a difference but its performances will be limited or enhanced by the rectifier. More to the point... when I tried the GZ34 Metal Base it made ALL the input tubes far, far, better, even ones that previously I had written off. In fact, for me it was a sort of an epiphany. That’s when I realized the importance of the rectifier.
The other tubes that made a difference were the Voltage Regulator tubes, but I would probably do these last. These are the cheapest and possibly the ones that I had the most fun with.
So if I were do do it all over again... The 6P15EV that come with the UFO25 are a no brainer, no need to roll these. First start with the Rectifier, next the input and last the VR tubes.
If you want to see the difference that the input tube makes I’ll give you one of my NOS Tesla PCC88, I have far more than I’ll ever use. These may not be to your liking but at least you’ll see/hear the difference the input tube makes.
However, the rectifier can make the input and output tubes better or worse, and not just a little better or worse. It’s like the anchor for the entire system.
A word of caution here... once you start down this road it can be hard to get off of it. Sometimes ignorance can be bliss, and this amp will be bliss as it comes. So let it burn in and then decide if you want to do any tube rolling.
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