tube rolling

First, have you confirmed that your phono amp will allow this? Secondly, the 6H23 tubes are a design that seems to have very love/hate opinions regarding. There are quite a few tube lovers who state that they do not like them as they do not produce enough of the tube sound they are seeking. Others like them for this same reason. The 6922/6DJ8 tubes are a good tube rolling tube as there are pretty substantial differences between different NOS types, allowing you to taylor your sound via the tubes to your tastes/goals/objectives. From what I understand the 6h23's do not allow for nearly as much rolling success. Personally, I have not rolled these tubes as I have avoided buying equipment with them installed as I am not crazy about their sound and this reduced flexibility. Others may have very different opinion (likely) on these tubes vs. other tubes in terms of results from rolling.