The arguments for high power vs low power Single-Ended tube audio amplifiers have been made for decades and there are many. It seems both have their strengths and compromises. But audiophiles often ask if there is a way to get the subtle details and life-like nuisances of a class “A” SE tube amp in a higher power amp design able to drive any speaker to louder volumes, especially for larger rooms. Typically the answer was “no”, or at least just a “maybe”. Sure SE amps can be made to provide double the power of the famed 300B tube‘s 8W output, perhaps triple that power. But we’re talking about a REAL power increase. Something dramatic. Well folks, now the answer is, “YES!”
NAT Audio recently released their Magma New SE monoblock tube amplifiers. These amps are rated for output up to 170 Watts @ 4 & 8 ohms! It uses only two tubes per channel so the signal path is not messed with like it is in typical high-power amp circuits using several times as many tubes. The input/driver tube is the common 6N1p-EB tube. The output power tube is certainly not common – a GM100 power triode, intended for use in transmitters.
Oh yeah, each monoblock weighs in at ~133lb so you’ll want to invite your audiophile buds over to help with unpacking and setup. 🙂
We found this little video on Youtube that will give you a close look inside the GM100 triode tube: