Noresco NE 561 Speakers

A great find came my way in this pair of Noresco NE 561 speakers, these are Canadian made with a well revered Isophon PH2132E dual concentric Alnico 8"X12" woofer with a 3" tweeter center mounted.

This pair of speakers has a beautiful walnut veneer cabinet that was a little sun bleached but a few nice coats of Circa 1856 Naturoil brought out the best in the cabinets.

I have swapped to this oil versus Minwax as the Minwax off gasses for 48 hours and this product is all natural.

I opted to upgrade the internal speaker wire to 16 gauge and replace the tired caps with Solen Fast Caps and it has completely opened up these speakers.

It looks t me like Noresco built these speakers to Isophon specs according to the data sheet.

So how do they sound, absolutely amazing on the Single Ended tube amp. They need a little bump up in the bass region but the mid range imaging is incredible. The cone tweeter is nice and smooth without any paper harshness, almost horn like. The dual concentric driver really shines in placement of instruments and musicians, the sound from one origin source is a real joy to listen to, no wonder the Isophon PH2132 drivers are well sought after.

The efficiency is pretty high of at least 95db at one watt, which suits the tube amp perfectly.

I have become a real fan of well designed speakers that use natural roll offs and a single capacitor in the crossover, it means that the drivers were designed to work together and they are not off the shelf  drivers.

Speakers that do this the best are EPI 100's, AR 18B's these Isophon drivers, the Tannoy Oxford Gold's and the Sound Dynamic Concert 500's all have a 1st order crossover and they all sound best on a tube amp.

These Noresco'c image incredibly well as if they are a window into the music. If you are a tube aficionado these speakers should be on your list of must hear speakers. 

TubeCube 7 tube amplifier

I picked up this little desktop tube amp for my son's Christmas present this year, replacing the Realistic System 11.

This fully assembled unit was well packaged and the fit and finish is really nice. It feels like a solid little amp in your hands.

I am just listening to my Electrohome Marseilles tube amp for the past few months as my only source of amplification. I was pretty excited to see what this 3.5 watt would sound like in a comparison. I burnt the amp in for 12 hours before giving it a serious listen.The Tube Cube 7 can be found on the Tube Depot site and runs for $179.95 with free delivery in the USA.

I first had a listen with the stock Chinese Sino EL84's with the Sino 12AX7B connect to a pair of Tannoy Oxford Gold's. The Tannoy's are very efficient so it was best suited to the 3.5 watts per channel.

The sound was very clear and transparent in the mid range and high's. The midrange and highs were not warm even having a bit of shrill at times. Although imaging side to side was excellent, back and for depth of the sound stage was not as deep as the Electrohome.

I also tested the TubeCube 7 with the Sound Dynamics Concert 500's, these are another efficient horn loaded speaker that pairs really well with tube amps. The sound was a bit better in the bass along with the same traits in sound as with the Tannoy's. Last up were the NAD Model 30's of which this little unit was striving to drive with clarity, the bottom end was very muddy.

I opted to replace the Sino tubes over to J/J EL84's and a J/J 12AX7B

The change over in tubes had an instant impact on the sound this little amplifier could achieve, it was like a veil was removed from the sound. Back where the sweet luscious mid's and high's with the bottom end filling out. The Tannoy's had their shine back, the warmth was there along with the depth of sound, next was the Sound Dynamics, where the bass was clearer and much more refined. Any shrill associated with the original Sino tubes was gone.

Overall this is a pretty cool entry into tube amps for a small space, we still have them hooked up to the Minimus 11 speakers. When trying to fill a larger room with bigger speakers this little amp tries and does a surprising good job, I found this amp best suited for a smaller office or bedroom. The output transformers are obviously not as robust as you would find in higher power units, I found it shy on the bottom end.

My wish list that I had for this amp is a headphone jack being a priority, it would be great to listen to through headphones. Two inputs would be nice too, but I would take the headphone jack first.

I would recommend one of these units as a starter into the tube world. I had mine shipped to a US address which help keep the cost down with the exchange rate.

The TubeDepot will also supply better tubes for this amp which I would step up to the J/J tubes all around.

The TubeCube 7 can be found here and the tube upgrades here.

Tube: Shuguang EL84 2pcs, 12AX7B 1pc

Power Output: 3.5W+3.5W @ 8 ohms

Frequency Response: 30-40Khz (+-1db)

Input Sensitivity: 500mV

Signal-to-Noise Ratio: -80dB / 3.5W

Residual Noise < 1mVac

Input AC Voltage: 100-250Vac

Power Consumption: 38W

Input Impedance: 50K ohms

Output Impedance: 8/6/4 ohms (Japan Z11-EI48*24 Output Transformers)

Dimensions: 130mm (w) x 130mm (d) x 130mm (h)

Weight: 2.6KG

Input: RCA Jacks

Output: Banana Jacks

AC: Standard IEC Jack with Fuse protection (2A Fuse)

Color: Black

 

Sound Dynamics 500 Concert Monitors finished.

The Sound Dynamics 500 Concert Monitors were finished this week but not without a bunch of extra delicate work.

I choose to use black foam surrounds as I like the look better than the red foam that were original.

The crossover got two new Solen caps in 3.3uf and 4,7uf value. The build quality is pretty good as there is a brace from the front baffle to the rear baffle.

I was all ready to audition these speakers through the tube amp only to find out the right tweeter was non functional. These horn tweeters with the black face are hard to come by and I did not want to buy a silver one from Ebay as they would not match.

I opted to take the horn tweeter apart and carefully remove the old voice coil. I found a donor voice coil from another pair of tweeters kicking around.

It was a very delicate operation to get the two very thin wires from the new voice coil to attach to the leads on the tweeter. Once I got them soldered I used model glue to attach the new voice coil to the diaphragm.
After several attempts I got the tweeter centered and working.

I really like these speakers when paired to the tube amp, I believe the sensitivity is north of 95db @ 1 watt so they sound nice and full when powered by the tubes.

Aesthetically I think they are gorgeous, the bottom end is full and the compression horn tweeters are spot on.

Sound Dynamics 500 Concert Monitor

These speakers followed me home today, Sound Dynamics 500 Concert Monitors. I am happy to have another pair of these wonderful speakers that match up very well with my tube amp.

I sold off my Sound Dynamics 10S a while back and kind of regretted it since. I am happy to have an updated pair of the same speakers fall back into the rotation.

Of course this pair will get re foamed with black foams instead of the orange originals as I like the look of the black foams. Also new Solen caps will be put in place along with new speaker terminals.

These 500 Concert Monitors are the later version of the 10S, they still have the 10" woofer and horn loaded tweeter, they come in a mirror image set and the cabinet is just a bit smaller.

I really look forward to listening to these speaker again.