I almost bought this but unfortunately it is a Push Pull design which lacks even order harmonics. That means that even though these designs give you more tube watts for your dollar, they have much less tube euphonic sound which is the even order harmonics. You can google this yourselves.
That's a very narrow view of SE vs. PP tube amps. Many highly regarded tube amps on the market today are Push-Pull designs...both types have pros and cons..
CForsytheI don't think we can say for sure that this would not power 603s to your desired listening level before distorting. I find that tube amp power is deceptive and I'm often surprised that I can power to my listening levels with 9WPC when a solid state 30WPC seems weak. The 603s are 90db sensitivity. Manufactures do lie about sensitivity! What I really like now is a good tube pre-amp or even a ss pre with nice harmonics combined with a modern type D - Purifi, Hypex, or 2x TPA3255. Combining the power and bass of a type D with the mid and upper harmonics from the tube pre does something magical that outshines my expensive Type A & Push-Pull amplifiers.
Sorry about the late response, but I bet those 603s would do just fine with the MT-12N. They're half a dB more sensitive than the JBL Studio 570 I've been using with mine, and for rooms on the smaller side, that combo gets rather loud. I wouldn't want to use either combo in a cavernously large living room.
Sorry about the late response. I'd expect that this amp would have no problems with the Motion 15s. It has been driving my 88dB JBL Studio 570 speakers rather nicely. I wouldn't use it in a large room, but for a bedroom or small living room it gets rather loud.
Voltage question: It's my understanding that many amps manufactured in China are meant to work at 110V. This amp has a sticker on the back that says 120V. The description for the amp states 110V. Does anyone know if the sticker really means it can run safely at 120V - or if it's just a sticker? Voltage at my house and my neighbors runs high at about 125V for some reason and I'm concerned about the amp overheating. Also, is it possible the amp is really meant to operate at 110V and using a voltage regulator is the answer? Would running the amp using a voltage regulator set to 110V damage the amp? Thanks in advance!
The US should have dropped the 110V designation in the mid to late 80's. Voltages in the US used to be 110V but have been standardized as 120V for nearly the last 30 years. Unfortunately many people and companies use the terminology interchangeably. They should not, they should only be using 120V. Your voltage can easily deviate +/-10% from this with no issues (other than slightly more or slightly less current being pulled depending on the voltage sag or overage). You do not need any regulator, just plug it in if you are in the US. It is a 120V device that is just improperly marked.