Playing with some big single ended triode amps and the likes - The Spartacus and the Phoenix from Thrax Audio

dcc

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I got the visit of François Saint-Gérand from Ana Mighty Sound.

A few weeks ago, François asked we whether he could test some his low wattage 300B SET power amps with my Stenheim Reference Ultime Two.

I found the idea rather odd, and I suggested to bring the Thrax Spartacus 300B mono blocks instead. Rumen Artarski, the CEO of Thrax, joined us. I had the pleasure hosting him a while ago when he came for a home demo of the Thrax Audio Libra preamp which I eventually purchased. Rumen is a no non-sense guy whose knowledge is impressive. We spent the whole weekend enjoying music and discussing.

I previously listened to the Spartacus in François' showroom. I compared them against the darTZeel NHB 468 and I must confess that I found the Spartacus even better than the big darTZeel.

The Spartacus are using six 300B tubes per channel and are delivering 50W in pure class A. They are designed to symbiotically work with the Libra preamp. They use sophisticated electronics to manage the tubes.

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The Spartacus are driving the Stenheim Reference Ultime Two with ease. The musical flow is just mesmerizing. Those mono blocks were clearly superior to my bi-amping combo (Krell Evolution One/Tenor Audio 175S) which is no slough. The rhythm, the pace, the soundstage and the slam of the Spartacus outclassed the Krell/Tenor Audio combo by a significant margin.

But Rumen Artarski had a surprise for me: the Thrax Phoenix. Don't try to find them on Thrax's website or catalogue. These are very limited production units that are only built to order. Instead of tubes, they are using very rare and out of production Static induction Transistor (SIT) from Tokin. These transistors are the closest to the 300B in terms of sonic characteristics. The Phoenix are delivering 100W of pure class A which should be ample enough for the Stenheim.

The Phoenix uses a casing like the Spartacus, but they are heavier with a weight of more than 100 Kg each instead of 55 Kg for the Spartacus.

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If the Spartacus were sovereign, the Phoenix are imperial. All the sonic characteristics of the Spartacus are further enhanced. You just listen to the music and forget all the rest.

I ordered a pair of Phoenix which should be delivered in about two months’ time. In the meantime, Rumen has graciously loaned me his demo pair.

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A big thanks to François Saint-Gérand from Ana Mighty Sound and Rumen Artarski from Thrax Audio for their customer service that is outstanding.
 
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Wlow! Congrats...i was just reading about the Nelson Pass SIT F4 which utilizes this SIT design. That is 10 watts. You are using the Thrax reference based on the SIT at 100 watts Pure Class A! Incredible.

Enjoy!
 
I got the visit of François Saint-Gérand from Ana Mighty Sound.

A few weeks ago, François asked we whether he could test some his low wattage 300B SET power amps with my Stenheim Reference Ultime Two.

I found the idea rather odd, and I suggested to bring the Thrax Spartacus 300B mono blocks instead. Rumen Artarski, the CEO of Thrax, joined us. I had the pleasure hosting him a while ago when he came for a home demo of the Thrax Audio Libra preamp which I eventually purchased. Rumen is a no non-sense guy whose knowledge is impressive. We spent the whole weekend enjoying music and discussing.

I previously listened to the Spartacus in François' showroom. I compared them against the darTZeel NHB 468 and I must confess that I found the Spartacus even better than the big darTZeel.

The Spartacus are using six 300B tubes per channel and are delivering 50W in pure class A. They are designed to symbiotically work with the Libra preamp. They use sophisticated electronics to manage the tubes.

View attachment 141470

View attachment 141471

View attachment 141472

The Spartacus are driving the Stenheim Reference Ultime Two with ease. The musical flow is just mesmerizing. Those mono blocks were clearly superior to my bi-amping combo Krell Evolution One/Tenor Audio 175S which is no slough. The rhythm, the pace, the soundstage and the slam of the Spartacus outclassed the Krell/Tenor Audio Combo by a significant margin.

But Rumen Artarski had a surprise for me: the Thrax Phoenix. Don't try to find them on Thrax's website or catalogue. These are very limited production units that are only built to order. Instead of tubes, they are using very rare and out of production Static induction Transistor (SIT) from Tokin. These transistors are the closest to the 300B in terms of sonic characteristics. The Phoenix are delivering 100W of pure class A which should be ample enough for the Stenheim.

The Phoenix uses a casing like the Spartacus, but they are heavier with a weight of more than 100 Kg each instead of 55 Kg for the Spartacus.

View attachment 141473

If the Spartacus were sovereign, the Phoenix are imperial. All the sonic characteristics of the Spartacus are further enhanced. You just listen to the music and forget all the rest.

I ordered a pair of Phoenix which should be delivered in about two months’ time. In the meantime, Rumen has graciously loaned me his demo pair.

View attachment 141474


A big thanks to François Saint-Gérand from Ana Mighty Sound and Rumen Artarski from Thrax Audio for their customer service that is outstanding.
I had preferred the thrax hybrid 100w to the big Dartzeel on the Alumine 5 at Anamighty. Also the preamp to the dart preamp
 
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Wow. Just…..wow. I love Ana Mighty Sound as they will post recommendations on their site.
I’d give anything to hear a system of that calibre.
 
@dcc Thank you for letting us participate in the development of your system. A lot has really happened with you recently! Your system should sound heavenly by now!

It's exemplary how a good partner can help you develop your own system - just as you are experiencing with Ana Mighty Sound. Great!
 
Thanks for the compliment. As the kids are now out of college and debt free, I can indulge myself.

I have been gradually replacing my previous system over the recent years with new components with the goal to build my ultimate dream system. Only the TAD D600 CD/SACD player and the Stacore rack are staying.

With the exception of the full NADAC combo, Ana Mighty Sound has indeed played a key role in getting me access to great components but also allowing me meeting some designers at my place (Rumen Artarski from Thrax Audio, Jean-Pascal Panchard from Stenheim, Hervé Delétraz from darTZeel). François always goes the extra mile for me. His analog setup skills are second to none.

I highly recommend him without hesitation.
 
Thanks for the compliment. As the kids are now out of college and debt free, I can indulge myself.

I have been gradually replacing my previous system over the recent years with new components with the goal to build my ultimate dream system. Only the TAD D600 CD/SACD player and the Stacore rack are staying.

With the exception of the full NADAC combo, Ana Mighty Sound has indeed played a key role in getting me access to great components but also allowing me meeting some designers at my place (Rumen Artarski from Thrax Audio, Jean-Pascal Panchard from Stenheim, Hervé Delétraz from darTZeel). François always goes the extra mile for me. His analog setup skills are second to none.

I highly recommend him without hesitation.
Fantastic news...will be fun to watch this system reach its full evolution. Are you saying Steinhem and Thrax reference amplification (preamp/amp) are also there to stay long-term?
 
I bet those amps sound amazing. I'm a pretty diehard tube fan. I really don't know anything about the technology behind them. InterestingYou went with the version that isn't a tube but solid state You do have the benefit of three hundred b tubes, not wearing out. 300B tubes can be expensive.
 
I had the 100 watt hybrid amp and the pre amp by Thrax at my house. They were very nice together.
 
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