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If you love SET amplifiers, boy do I have speaker for you.

I have had in-house for the last six weeks a pair of speakers that I'm reviewing for hometheaterreview.com from NSMT Loudspeakers, located in North Carolina, that are a perfect match with SET amplifiers.  I love SET amps.  However, historically I'm not a fan of single driver designs (rolled off high-end/lack of bass) or horn designs (I find them to have coloration that annoys me after a short while) that are normally used with beautiful sounding SET "Flea Watt" amps.  I have reviewed both types of speakers and they were good, but not keepers for me because of the above stated reasons.

The NSMT Model 50 is a small very attractive floor-stander which has an sensitivity rating of 101 dB and never dips below 8 ohms.  It is a three driver MTM two way design that loads into a double transmission line and really reaches down to 35Hz to 20 kHz in my room.  This is the third speaker I have reviewed from NSMT, the other two were wonderful music makers, and shows what a talented designer that Erol Ricketts is in all his designs at applying his unique version of transmission line loading. 

Now, the Model 50 sounds terrific with high power SS or tube based amplification.  But what has been enchanting for me is when I drive it with either a SET 2A3 amplifier, around 3.5 watts, or my Linear Tube Audio MicroZOTL as an integrated using the NOS 1940's Tung-Sol 6SN7 black glass oval plate tubes which produce only around 1 Watt.  With either amplifier this speaker completely disappears, the beautiful colors/timbres just float out and 3D chunky images of the players fill the soundstage.  However, because of the very high sensitivity of the Model 50 and its transmission line loading the foundation of the music, true deep bass, and overall dynamics/dB levels are hard to believe.

So, if you have or always wanted to try out a SET amplifier this speaker is a great choice.  The Model 50 retails for $1,800.00 a pair, so they are very affordable to team-up with your SET amplifier.  If you want a lot more details just go to NSMT-loudspeakers website.    
teajay

Showing 5 responses by charles1dad

charles1dad's avatar
charles1dad
6,996 posts
 
Hi Bill.,
 Ok I understand your objective,  exploring the specific category of  the 45 and 2A3 tubes. In that case the NSMT speaker seems an excellent place to start the process.
Charles 
charles1dad's avatar
charles1dad
6,996 posts
 
Hi Teajay, 
I've heard the LTA Micro used as a 1 watt integrated amp driving the Tekton Double Impacts.  It was a good sound but bettered by Aric Audio 300b SET and the Coincident Frankenstein. I was pleasantly surprised by the result of a 6SN7 as an output power tube.
Charles 
charles1dad's avatar
charles1dad
6,996 posts
 
Aric,
 Hi and I really appreciate your candor and advice. I'm a confirmed DHT SET aficianodo.  However I've advised people that if you're going to utilize these special tubes, do it right. You are absolutely correct in that you can't skimp on the quality of parts/transformers,  you're wasting time and money. 

You'd definitely better served with a indirectly heated Pentode than cutting corners trying to build/buy a DHT SET cheaply.. Now if done right DHT can be genuinely fabulous. 
Charles 
charles1dad's avatar
charles1dad
6,996 posts
 
Hi Bill,
Merry Christmas to you and your wife. I remember when you all left Indiana for Tennessee, 5 years already.? With all the hiking you’re doing through the Tennessee hills you must be fit as the proverbial fiddle 😊.
I am happy to hear retirement has worked out so well for both of you.

Those 101 db/8 ohm speakers do swing open the doors of possibilities as teajay alludes to. In terms of the low power amplifiers IMHO the Frankensteins are going to be very tough to exceed . Many very good amps in this genre, but better? That’s a different story.
I bet these NSMT speakers are ’quite’ good but wonder how they’d fare against your Triumphs Extremes II ? This discontinued Coincident model was exceptionally good and a fine effort from Israel Blume.
Charles
charles1dad's avatar
charles1dad
6,996 posts
 
Aric
Numerous very established/highly respected SET manufacturers has written the same regarding DC versus AC heating. You are definitely on the right track in your findings/conclusions. Some believe that the 45, 50 and 2A3 ’may’ successfully allow AC heating (withoutt hum issues) but is more difficult with the higher powered 300b tube. Many listeners agree with you, poorly implemented DC heating can sound lifeless relative to AC heating.


BTW I agree with your comments regarding the availability of efficient easy to drive speakers. A friend of mine recently acquired a world class level 2A3 SET. He is very pleasantly impressed by the many good options in the Hiigh End marketplace for these types of speakers. 
Charles 
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