I've run mismatched tubes lots of times. Every time one blows another goes in for however long it takes me to get around to buying another set. Always do full sets. Because almost always when a tube goes its been long enough to do the set anyway. Once in a very great while if one tube goes and they're pretty new then I will replace just that one. In nearly 30 years that has only happened with the Tubestore.com Preferred Series, which when 2 out of 4 blow spectacularly within a month they became my Never Again Series!
To answer the question no, I've never heard any difference. In fairness these are all Tube Store perfect match, they test and write a number and since the first one tried worked I always order that same number. But I didn't always do that and don't recall ever hearing any difference even then.
If you're really concerned and out to save money the way to find out for sure is simply buy one or two unmatched tubes. Probably you will find no audible difference. Worst case you wind up with a spare or two.
I do this with a lot by the way, and not only with tubes. Everyone has their opinion, and they'll argue it a million ways to the end of time. When nine times out of ten its not that hard to try it for yourself and then you know.
To answer the question no, I've never heard any difference. In fairness these are all Tube Store perfect match, they test and write a number and since the first one tried worked I always order that same number. But I didn't always do that and don't recall ever hearing any difference even then.
If you're really concerned and out to save money the way to find out for sure is simply buy one or two unmatched tubes. Probably you will find no audible difference. Worst case you wind up with a spare or two.
I do this with a lot by the way, and not only with tubes. Everyone has their opinion, and they'll argue it a million ways to the end of time. When nine times out of ten its not that hard to try it for yourself and then you know.