I wish I could help you more, but I loved the sound of the Magnum 99 out of the box. However, this may be due to this being my first piece of tube gear and the fact that it was such a gigantic step up from my Pioneer A/V reciever based system. I have yet to start tube rolling, but I would love to hear about whatever decision you ultimatly make.
As far as break in period, I thought I could really notice a change somewhere between the 50-100 hour mark. I must again however say that I am not sure it was just the preamp breaking in as I upgraded so many pieces at once. (M-120's and PS Audio Statement IC's)
As far as break in period, I thought I could really notice a change somewhere between the 50-100 hour mark. I must again however say that I am not sure it was just the preamp breaking in as I upgraded so many pieces at once. (M-120's and PS Audio Statement IC's)