I swapped my tubes about 2 months ago. Ediswan vintage for the preamp, Raytheon nos 6sn7 , and lastly Svetlana kt88. It made a world of difference in every respect! The bass was tighter and deeper. The soundstaging was much fuller. It was like getting a completely new amp. Talk to kevin Deal at upscale audio. He knows this amp better than anyone else and has several tube options. Go for it! You'll be happy you did.
