i have a preamp that uses 6sn7 in the line stage. i too have been wrestling with generating a particular sonic palette.
i got advice from charles at Vacuum Tube Valley. He sent me many tubes to audition before settling on a 60's tungsol.
unfortunately, based upon my experience, it is necessary to listen to the tubes and not accept the experience of others, who, although well intentioned, don't have your ears or your brain.
find an accomodating dealer and listen. Perhaps Vacuum Tube Vally will work with you. Tubes are not inexpensive, especially certain brands.
i got advice from charles at Vacuum Tube Valley. He sent me many tubes to audition before settling on a 60's tungsol.
unfortunately, based upon my experience, it is necessary to listen to the tubes and not accept the experience of others, who, although well intentioned, don't have your ears or your brain.
find an accomodating dealer and listen. Perhaps Vacuum Tube Vally will work with you. Tubes are not inexpensive, especially certain brands.