Supratek Owners Thread

@jslateiv Thanks for helping me understand the difference (or should I say no difference) between the two power supplies.

Well it finally came to pass, and I would like to share it with you, who contributed to this thread: my custom White Grange arrived in the first week of November, exactly a year after I had placed the order with Mick: good things will come to the one who waits! I had to completely rearrange my equipment and decided to build a new rack. I found a store room shelf assembly at Loews made of hard PVC for $145.00. I cut the "columns" to size, filled them with slow-setting concrete, and painted the entire assembly to create a unified look with the rest of my instruments. I prevented sagging of the shelves by supporting them with cross beams suspended on two threaded rods in the center: works like a charm with zero vibration anywhere. Moreover, the rack comes with ribbed shelves, which allow for superb air circulation.  I would love to show you pictures here but I don't know how to imbed them on this thread. So, I am showing them on my FB page (yes, I am THAT old), under "Reimar Bruening". Check it out.

In the beginning, I was taken aback by the very high gain of the phono stage. With the gain setting at around 10 o'clock and the volume at 9 o'clock, I got terrible noise on the left channel. Mick and another stateside customer, Johnny Slate, suggested a bad tube and to switch them one at a time from left to right. As it turned out, they were right: switching the 6688 (E180F) brought the noise to the right channel, and a few days later a new NOS set of tubes from eBay eliminated the noise altogether. However, while the sound began to bloom, I was missing the deep soundstage my previous set up had produced (Sunvalley SV-EQ1616 paired with Ed Shilling's "The Truth" optical preamp). After a three week burn-in, the sound stage improved somewhat but the placement of the instruments and the soloists was for lack of a better word "undecided", "wandering around the stage" depending on the temporary loudness of the respective source; moreover, I had to turn the balance knob all the way to the left to get a somewhat centered image: weird. I also noticed that this effect was more pronounced by the 6NS7 tubes and less so with the 300Bs (the Grange provides both options: the instrument was shipped with NOS 6SN7s by Australian brand Miniwatt, while the 300Bs are new Linlai from China). The 300Bs, however, are more powerful providing an overall "larger" musical experience, but still no precise instrument placement. Also, the timbre of the high octaves of a grand piano tends to be more "percussive" with the 300Bs (this is always a litmus test for me: Da Falla "Nights in the Gardens of Spain" with Rubinstein and the Phillies, RCA LSC3135). Well, that was disappointing. So I  began scouting for replacement tubes for the stock 6NS7s and found an intriguing pair on a Canadian site, Grant Fidelity, namely their custom-designed "Treasure Globes", made by Chinese maker Shuguang (

They arrived this morning and without any burn-in, they sound absolutely amazing. This is the sound which I associated in my dreams with the Grange, while waiting for an entire year for its arrival. The instruments are now firmly in place in a wide sound stage that extends about 3 feet on both sides of my speakers (Ellington Jazz Party In Stereo, Columbia CS 8127, original pressing) and their respective timbres are spot-on; moreover, the balance dial is now dead center. I try to keep this short; only so much: your SUPRATEKs might not perform to their fullest capabilities, if you use them with the stock 6SN7s or 300Bs. If you feel, there could be even more, or if something feels amiss of outright wrong, it's most likely time for tube-rolling. In my case, it became a revelation, and I can now see why other SUPRATEK fans swoon over their instruments. My next quest will be for the optimal 300Bs and 45s: stay tuned. But I am already completely sold with the "Treasure Globes".

@reimarc thanks for posting

Could you share a picture of the Linlai that came with the preamp?

For 45 try the EML 45B, I personally like it 

Hi @reimarc 

The reason I asked about the Linlai's is that these are supposed to be good tubes but the stock you received could have been different. There is a thread about these, the ones with the E are supposed to the best and the Linlai letters on the tube are running vertically.

There are some others the letters run horizontally and some have described these as different.

That's why I was trying to find out the ones that did not work for you which specific type were

thu

These are available at Grant fidelity. These are the ones you want