I thought I would share my impressions of the Saga Preamp and some of the Tube Rolling I have already done on it. Firstly, I would like to say how impressed I am with the sound form the Stock Tubes. If tube rolling was not so cheap(for non RCA tubes) and fun I would not bother and just enjoy the music if tube rolling is intimidating to you. I am just going to place the tubes in rank order with some comments 1. RCA Red base: Mike is correct, this tube is really a revelation. Wide and Deep soundstage. Presence is excellent and you can hear more dynamic range. 2. Hitachi, Hytron GT and GE GTB tubes: Noticeable improvement over stock tube. I would not cry into my drink with any of these. GE voices closest to the RCA and the Hitachi and Hytron are more mellow. All are very pleasant. I got these tubes for about $10 each and they represent the best value. 3. Tung-Sol GTB: Very warm. Too warm for my taste. I place it here in the list, not because I liked it, but because others might gravitate to it. This one was $20. 4. Sylvania GTB: slight improvement over stock: not enough to bother. 5. Stock tube: Very nice. Serves as the baseline. 6. Sylvania GTA: Midrange emphasis. Good for vocals I suppose. 7. JJ Electronics New Tube: Quite the disappointment given how much I like their E88CC tubes.