@1graber2 I replaced the stock 12AU7 tubes on my Dialogue Premium integrated amp with Cifte 12AU7 as recommended by Upscale Audio. These tubes added more texture and a more holographic sound. I also tried other NOS tubes that are all better sounding than the stock tubes. I also replaced the stock power tubes. I suggest you call Upscale so they can help with deciding which tubes may help your needs.