One very significant thing I forgot to mention: This amp is DEAD SILENT. Absolutely no tubey hiss or transformer hum, even when you put your hear right next to the tweeter. Amazing!
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I know this is an old thread, but. . .I just got a newer version of this amp and am blown away. I have two very different setups in two different rooms, and the MG 15 is on a pair of vintage klipsch fortes with and audio gd dac19df. Love the sound. You get the feeling because the amp is so simple that there is little that can be done wrong. Natural music, gotta love it! Noticed you might have moved on to a different amp? Anyway hope you are still enjoying the tunes.
I just picked up an older and perhaps original version of this amp and am quite happy with it. I'm using 86 db, 6 ohm Paisley Research Model AE500's (rated for 20-100 watt amps) which is really not a terrific match on paper but it plays them plenty loud in both triode and pentode modes in my largish 23 x 16 living room. It came with J/J input tubes and Chinese (maybe Shuguang) KT88s labeled Antique sound labs. This combo might be standard, I am not sure.
I prefer the Triode mode as it has more air and is sweeter sounder with better imaging. The best thing about this amp is that it is like owning 2 different tube amps. When I want to hear something different, I just change modes.
I must admit, I never really did a lot of listening to KT88 tubes; however, the little that I heard of them in push pull, I was never really a big fan. In the last several years I have owned EL84/6BQ5 integrated amps in push pull and SE and really like the sweetness of this tube so I was always curious to hear how much better would a KT88 be in a single ended design. With my 86 db Paisleys is just has an ease to the sound and makes everything just sound right and really good.
Pretty soon I'll be getting a pair of 8 ohm Mordaunt Short MS20's that are rated for 10-80 watt amps that should be a much better match for the ASL and will update this once I've auditioned the MS speakers.
I have read very good things online about replacing the stock power cord with an specialized after market cord and also tube rolling the input and output tubes; however, not too shabby in its stock form. Very glad I was able to find this amp.
I continue to enjoy the sound of this amp whether it's in Triode or Pentode mode. The larger Paisley Research speakers are much better suited to my large living room; however, the Mordaunt Short MS20's are also very sweet sounding as well. I still prefer Triode mode as it definitely has better imaging, air, and is more euphonic sounding while the Pentode mode is more transparent. I'd be very curious to hear this amp with some higher efficiency Klipsch's or single driver speakers and I still enjoy going back and forth between the 2 different modes this amplifier is wired in. One day Triode, the next day Pentode - it's all good :)