Tube Rolling - No Change in Sound

>>I still STRONGLY maintain that the sonic signature of any system is at least 85% determined by the amp and speakers.<<

IME it's difficult to assess the performance of either component without consideration of the other. The same analogy can be applied to tonearms and cartridges.

That being said, I believe that speakers have the strongest influence on a system's sonic signature followed by sources not the amplifier.

YMMV

For once, a thread where everybody is right!

FWIW, I have been able to get pretty significant changes in my rig's sound by rolling 6dj8's in a number of different preamps in driver and output stages. The Kenrads definitely added some of the "fat tone" flavor vs. other tubes, especially in an Atma-Sphere MP3, which is relatively good at allowing you to hear the differences in various tubes. Cheers,
Spencer

I rolled 6922's and experienced little change; however I rolled some 12au7's and experienced dramatic change. They were NOS 50's vintage, this was in a CJ.

Thanks for all the comments. I am not sure I am any more illuminated than when I began, given the diverse views, but I suspect the observation that the pre may not be sensitive to tube-rolling may be the most accurate -- at least with the KenRads. (FYI, my amp is a Krell FPB 300cx.)I wonder if more extensive burn-in (these are NOS tubes) will effect a change. Time will tell.

Thanks again.

Neal

Ken-Rad VT231 has been known to deliver excellent bass and sweet mids. Sounds like you didn't get any of that! Well, at least, you will probably be able to easily sell them.