Gentlemen,
There's a new review on the website DAGOGO by Richard Austen regarding a new company's (KingKo Audio) KA-101 integrated amplifier that right now sells for whopping $830.00! It's a P/P 12 watt El-84 based design. It also has a built in PREAMP IN feature so you can run it directly with your preamplifier. Austen's review is very informative regarding SET designs comparing them to P/P and different kinds of power tubes. He raves that this little inexpensive amp is extremely well built, very easy to roll the tubes to get a higher performance, is cool looking (twin meters) and competes with much more expensive amps. He believes that it comes somewhat close to some of the special qualities of an SET. I know nothing about this author, but he writes well and has some very good gear in his system and has tried amps from Audio Space/Line Magnetic, so he seems legit. Hell, I have wasted more money on a few bad meals then this amp costs, so this might be worth checking out if you want to play with tubes driving the DI's.