I own an 845 Premium. While I am enjoying listening to the amp, it's my first experience of 845 and 300B tubes. Could those more experienced chime in on how long break-in is for these tubes? To my ears, the sound still seems thinner and perhaps more tipped up in the HF's than I would have anticipated. Burning-in the tubes is a bit of a bear because these things with their grid voltages can't be left unattended so it's a few hours here & there. I went for the Acme 845's and 300B Black Treasures right from the start , no idea whether they need extended time. Thanks for the input.
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