Welcome aboard!
I’m curious, what tube you’re running in the Saga? How is it different than the stock tube?
I'm glad you asked about Saga+ tubes, since I've rolled quite a few of them and wish to share my impressions. I'll begin with a cut and paste from my post to the Cheap and Cheerful circle:
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I own two Saga+ preamps. I think they are exceptional if you choose the right tube. I've tried dozens, not including the Linlai. My favorites are two vintage 6SN7GT tubes with flat, staggered plates: The Ken Rad (later GE) from 1944 to 1947, and the Sylvania from 1951 and 1952. The Sylvania was also marketed under a number of brand names, but it usually has the Sylvania manufacturer code, 312.
The Ken Rad (GE) and Sylvania tubes can be found on ebay. The Sylvanias are sometimes quite a bargain (around $30). It's important to check for balanced, high measurements, around 100/100 on a TV-7 tester or 2800/2800 (or so) on a Hickok tester.
Maybe you'd like to try a Ken Rad or Sylvania in your Saga+.
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Right now I have the Sylvania tubes in both of my Saga+ preamps. [The second one is in my bedroom setup, where I also use the Wharfedale Diamond 225 speakers.] But I swap in the Ken Rads periodically.
Both the Sylvanias and the Ken Rads are clear and lively, with no graininess or other typical tube imperfections. The OG tubes I've tried are the JJ and the (new production) Tung Sol. I have the 6N8S and haven't felt it was worth trying. The JJ completely lacks character. The Tung Sol is warm, but not very clear, and it's grainy.
If you can find a Sylvania or Ken Rad like I've described for a good price, get it. I am confident that you will think it's a big improvement.
Best wishes!