So I as advertised, I owe a short summary of the NAT Magma Evo sound.
First a bit of history. After using the Dan D’Agostino M400 monos for a couple of years, I decided to take the plunge and give NAT’s Magmas a go. The first amp I tested was the Magma M HPS which used the Russian GM30 tubes. The sound was mesmerizing from the get go, but the D’Ags being my only point of reference, I felt that the Magma M with the GM30 tubes performed slightly too colored for my taste in the high power mode, while sounding magnificently in the higs and mids on the low power mode. The low power mode sadly lacked bass, so I decided on using the high power mode. At that point, however, I wasn’t sold on the whole concept as D’Ags still had some advantages over Magma M’s with GM30s while obviously certain aspects of the sound were superior with the NATs.
After a while both
@Ron Resnick and then later Dejan told me about the Eimac tubes. So this was my next experiment. At this point, things started leaning heavily towards the NAT Magma M amps as compared to D’Ags. Eimac’s at high power mode had less distortion a better damping factor for the bass and had more control (read “speed in sound”) than the D’Ags. I never really bothered with the low power mode and the Eimac’s because they performed so well in high power mode.
Fast forward several months later and now I’m the owner of the NAT flagship Magma Evo amps. To be quite honest, I was a bit skeptical at first as to what to expect — given how happy I was with the Magma M/Eimac tube combo, but Dejan assured me testing out Magma Evos would be worth my while.
My initial test of the Magma Evos with the colossal GM100 tubes started in low power mode. This is roughly around 50W per channel — pure single end class A tube muscle. Immediately, it was apparent that even in the low power mode, the amp had tremendous control over my Coltrane 3 speakers. The difference in control (compared to Magma M/Eimac) was as similar as when I moved up from a D’Ag stereo amp to the M400 monos.
Startling control really of the Coltrane 3 speakers given the “modest” 50W per channel. The tone was more fleshed out and palpable, the imaging was more focused and there was more of that illusion of 3D space around the instruments. The Magma Evo in low power mode would never skip a beat — not even on the most complex pieces of music. And believe my, I threw everything at it, from massive symphonies to Metallica to Yello, Hans Zimmer live and who knows what else. The heat emission also is way lower in the low power mode, so at that moment, the amp seemed to tick all the boxes for me. Another thing, the low power mode had way more control of the bass drivers than the Magma M/Eimac combo in high mode. In short, this beast of an amplifier is pretty much superior in every way to the Magma M/Eimac combo.
Another extremely important note is that the Magma Evo has significantly less distortion in the sound which is manifested in a crystal clear tone that — though being highly extended — feels sweet at the top and never fatiguing. I am a sucker for great highs (hence my love for the Accuton diamond tweeters) and Magma Evo delivered this in such a way like I’ve never heard with my Coltrane 3’s before.
Being curious, I of course switched on several occasions to the high power mode. Oddly enough, the warmer and fleshier sound of the high power mode would fail in delivering the transparency and “purity“ of the low power mode and even the scene would collapse somewhat — counterintuitive to what you’d expect to get from more watts pumped into your speaker — and similar to how the GM30 tube performed. With one major difference obviously and that‘s the fact that GM100 in Evos low power mode is superior to every other setup I’ve mentioned in this write up.
What this tells me is that the GM100 tube is glorious as long as it’s driven more conservatively. The Eimac tube on the other hand had no such issues and would perform better in that sense (being pushed close to its operating high). Granted, let’s not forget my conclusion in the previous paragraph.
So there you have it, things are never totally cut and dry. Here to give you my 2 cents as this may help someone down the road.
In closing, for the first time in my hi-fi career I am seeing a pair of amps as “lifers”. And in my case that’s the NAT Magma Evolution. It just hits that elusive ethereal thread of speed, clarity and resoluteness of top of the line solid state, while seducing with those glorious even harmonics in the highs. Truly the best of both worlds. And I can live with the heat, it’s really not as bad as I had feared.