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Questions about tubes and gear that glows. FAQ

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RE: Most important is you control AB testing

Posted by DAK on February 2, 2017 at 11:59:34:
I go with AndyE, for being extremely familiar with the music that you are using to discern any differences. Of course only one parameter can be changed which is the tube. Since wall voltage has a great effect on the performance on all your equipment the comparisons is ideally made during the same time of day. Ok, i am getting very picky but if you are making a serious comparison you need to keep all the variables the same except the tube. To that end i did most of my tube rolling at past 11.30 PM when most everyone is asleep and the AC is down to 117 and ambient noise is also at very low levels.
But, if you just want to go with a general overall impression by dropping in some different tubes that is ok, but not a methodical way to approach tube rolling.