I don't think it will ever be truly silent-no noise at all. That's just the nature of tubes. Rather judge it on how it plays the sounds not the silence. I have used many different tubes in AI - it does eat them- and none were absolutely quiet including brand new expensive Telefunken's. I have used Upscale's Russian tubes particularly his 6H23's ($25@)and they sounded very nice. I haved also used Tungsram's they sounded a bit better. Note as the tube's age, and they age prematurely in the AI, they will become noisier--you hear a rush. Check the AI web site it's finally up now and note their detailed discussion of tubes.
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