Preamp Deal of the Century

Thanks Slowhand. That's exactly what I need. Jazzdude, I don't have issues with microphonics. What I notice is that very quiet 6SN7's are difficult to find. There is a background noise that is circuit noise. I'm guessing that since the tubes are so close to each other that they may be picking up noise from each other. I was wondering if anyone has placed a temporary grounded shield around each tube to lower the noise floor. No need for me to try this if others already have. Again, it's not that noisy and I'm not disappointed. Can't blame me for wanting it to be totally silent.

Hello Patrick,

Congrats on your Syrah! My recommendations for rectifiers and regulators are as follows:

Mullard Metal Base Gz34 - by far, the best in my set up. Followed closely by the regular black base variety. In my Chenin, the 6106 produces a "chugging" sound on the phono section, so I cannot use them. One good bargain is the Mullard "Dynaco" branded GZ34 you can find at Ebay often. Also, the IEC Brand but Holland made GZ34's are great.

The 6F6G's(I have Sylvania's) are good in mine as regulators. But I am currently using the Sovtek 6L6GC's that Mick recommends. Very cheap but very nice in my system. I bought it as a match pair (within 2%) for $50 plus shipping. I noticed a little "thinness" on the phono section with the 6F6G's but does not have it with the Sovtek. In my set up only of course.

As for the phono, your preamp and mine uses different type of tubes so I hope some Syrah owners can share their experiences with you. Oh, one more thing, I have the PSU and the Preamp on Audiopoints (the smaller version)and I really like the results. As if more clarity and definition (but does not upset the weight)had been added to the presentation. I think it has something to do with "channeling" the vibrations from tubes away from the platform. Maybe you will like it. Just aks Tom (TWL)about the points. He works for the manufacturer in which I am not affiliated to by any means.

Happy 4th!

Abe

Hello All, The tube line up in my Chenin is as follows.....Power supply, a superb [well burnt in] 1954 Bendix 6106. Regulators, A very early mirror matched pair of Sylvania 6F6Gs, clear glass ,old style round logo and etched base,very handsome looking .These are one of two pairs of 6F6gs I have.The Bendix and 6f6gs are [outstanding] inexpensive up grades in over all performance of the Chenin.6SN7s,A good pair of Tungsol black glass round plates.For me ,vocals have to sound right.With the Tungsols in place,Ella,Nat Cole,Sarah Vaughn ect.ect.are truly superb.One recent L.P. purchase,Joan Baez,Diamonds and Rust.The recording is one of the top best I have,the vocals captured on this L.P.are truly uncanny.I had a pair of Sylvania tall glass metal base in place afew months ago along with a used Dutch made bugal boy metal base GZ-34.Listening to Rock,Pink Floyd, Yes, The Who ect,I never heard them like this on a two channel system.It was a heavy experience.On Jazz and Folk,it was not as involving as my current choice of tubes .The phono stage,I use a mirror matched pair of 1949 R.C.A. black plate 6C4s and a pair of Philips Miniwatt S.Q. gold pins,the test values on these Miniwatts are outstanding.I did more switching of power supply tubes then any others in my Chenin.For me ,the Bendix is the one.One final note , my pre. is quiet as a church mouse...Love it.

Hi Gang: Yes indeed, quiet 6sn7's are hard to find and all of that family of tubes tend to be somewhat prone to microphonics. Herbies tube dampeners are a blessing here as well as isolation. The Metal base GZ-34/5ar4 is without doubt the finest sounding of that family of rectifiers. When using substitute rectifiers like the 5v4,gz33,5z4,gz37,6106 etc,it is imperative that they test above 95% and both sides measure the same. The chugging sound some are experiencing here when playing vinyl is due to the excessive voltage drop of the rectifier type used. Insert a weak rectifier of any type and you may experience this artifact regardless of type, however the gz34/5ar4 will not exhibit this trait until it's much weaker than the others.Furthermore, ones choice of regulation tubes will not have any impact on this artifact. While a weaker rectifier may work in many other applications... they will be of marginal success in any of the supratek's that employ a phono stage. I have a nos Valvo gz-34 [test's just below 90%]that I use in a pair of vintage siemens klangfilm amps and they ehibit this trait in both the cortese and the syrah when using the phono stage. I also experience the same thing with a nos 5v4 and a Bendex 6106 and they both test above 90%. " Important Note"... all of the rectifiers that are employed in the supratek's are of the "indirectly heated" full wave variety, the 5y3gt mentioned else where is a "directly heated" rectifier type and not recommended. The use of directly heated rectifier types in the suprateks will eventually strip the cathodes of your other tubes. Not a good thing for those employing rare and expensive nos tubes. A directly heated rectifier will cause premature tube life with the other tubes as the getter of the tubes is used up quickly releasing gas in the tube.When cold,the gas molecules are struck by high energy electrons from the cathode, being positive they are attracted to the negative grid. The gas molecules will shoot right past the grid and onto the cathode,and therefore eventually eroding the cathode surface and compromises the life of the tubes. The other tubes employed in the preamp should not have instantanious voltage applied until they are warm, this allows the tubes getter to absorb the gas molecules that have accumulated from that last use of the preamp.

The last several posts have been most valuable to me. Thanks to all of you!