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6SL7 Tube Recommendations for Aretha Preamp

Posted by escape2cfc on September 13, 2021 at 20:57:56:
Hi, I am expecting an Erhard Audio Aretha Preamp to arrive this week... It uses 4 - 6SL7 Tubes. This is a new tube type for me. It was shipped with 4 Tung-Sol 6SL7GT's. I would like some recommendations for good Sounding Old Stock to be on the look out for. I do have some untested RCA 6SL7 GT's and RCA 5691 Red Base Tubes in my possession. Any Information is appreciated! Including any comparisons between 6SN7 and 6SL7 Tubes Sound Wise...Thanks! Chuck