Not exactly on point but....I have the Prologue One and have played with tube rolling for three months. The bottom line....the stock tubes were excellent and the replacement tubes I ended up using were not that much better sonically than the originals. I probably would/should have been happy with the originals - I was just curious. What I did learn of importance was - I have 4 ohm speakers and I assumed they would sound better connected to the 4 ohm tap. This turned out to be the cause a raggedness in the uppermids/highs that I had initially attributed to the tube complement. Connected to the 8 ohm taps, with the exception of a very little bit of softness in the bass (my speakers are cacaple of very tight bass) the raggedness in the upper end disappeared. Just something to consider before you embark on tube changes.
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