I was on Sophia Electric's website and saw they carry 6SN7's for $100 apiece. That seems pretty steep and I don't know of anyone that has used them. Just mentioning another source for you.
Agree with several of your other posters. No need to change the 6AS7 output tubes. Play around with NOS 6SN7's in the first row first. To be honest I've noticed less of a difference with tube swapping in my S30 than most of my other amps. I'm not saying there is not a difference - it's just more subtle. Don't expect night and day difference. The S30 really does sound very nice out of the box.
Sibelius you are sooo right. The S30 does sound very nice out of the box. Thanks for the tip on the front row tubes. I understand now the critical tube locations to try. I had some microphonic feedback which was interrupted by tapping one of the front row tubes ever so lightly. I am going to keep GTBs or later in the back row. Nice to have an amp where you are not thinking in the back of your mind "it could be better if only the tubes were........."
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