These Sylvania metal base 6SN7 are epic. They dont have the typically warm Sylvania sound. They are very, very well balanced. My KT170s are breaking in and the Frankie is solid as ever….
That's interesting. I have found the bass to vary considerably among the Sylvania tubes. Some Sylvania listening notes:In my experience Sylvanias do not have a warm sound. In fact, I have found the VT231s to be kind of thin sounding and bass light.
Quick comment follow up...
I asked Lukasz if the superb Mullard ECC32/31 (CV181) could be used in the Horizon without hurting the transformers since that tube has a higher current draw than a conventional 6SN7. He said no problem as his transformers are over-engineered and can take 4X the current of the CV181!! They do indeed sound excellent in the Horizon.
Also, beware of any Mullard ECC32 or ECC31 with black bases. They are most likely Russian made frauds. Genuine Mullard 32/31 have the classic micanol speckled brown bases characteristic of the Blackburn factory with date codes etched in the glass, and not painted on the tube. Authentic Blackburn Mullard CV181's may however be re-labeled with other brands (i.e., Amperex, Philips, QTL, others).
When you like sylvania , use the 7n7 tube you need only loktal to oktal adapter. I think its your favorite afterThese Sylvania metal base 6SN7 are epic. They dont have the typically warm Sylvania sound. They are very, very well balanced. My KT170s are breaking in and the Frankie is solid as ever….
Yes, I read on the internet that all black base are Russian fakes. I’ll give you $5 for them
David, I have no idea. I can't read the date codes but I don't see a prominent "B"which indicates the Blackburn factory. Nor can I tell if the date codes are painted or etched. But the internet is filled with reports of Russian Mullard tubes being sold as genuine Blackburn Mullards. A simple Google search for "Fake Mullard Russian Tubes" turns up nearly a dozen threads from AudioAsylum, Gear Head and many others spanning nearly 2 decades and for many varieties of tubes, the CV181 included. I do know that folks that have been doing this for decades such as Brent Jesse states that the risk of fraud is high with black bases for EL34's and he will not carry them for that reason. Also, take a look at some of the Ebay listings.
5 Mullard ECC31s (w black bases) for $500? The old saying is that if it looks too good to be true, it probably is. Some of these listings don't have the same smoked glass appearance as the authentic Blackburn Mullards CV181s, but I am no expert. I'm just reporting information that many others have found. My preference is to play it safe and purchase the Mullard 32 or 31 only if they have the brown speckled bases. For all I know, you may have perfectly fine tubes in any case. If they sound good, and you're happy, isn't that all that matters? But for other looking for Mullards, genuine ECC31s seem to be going for about $600/pair and the ECC32 for about $1200 a pair although hanoitubes has listed some for $2200 a pair! Caveat Emptor!! FYI for those interested, the ECC31 is identical to the ECC32 but it has a common cathode grid and therefore requires an inexpensive adapter (ebay) to use in the Horizon. Both have Lukasz' approval.https://www.ebay.it/itm/284908161038?hash=item4255d9880e:gzIAAOSw7mpi3SQW&amdata=enc:AQAHAAAAoGyFoEI+UPh6ad8Prg14aukQ0DGPEnHMXdx0jxVOXDzrLeAtPLV+Fvqixbh8ktZKeljmkSLyfeu0fikEKcdThQ4aEyCBlV8oWg5p/4FnOGQk2su5kp5i16Ptq+to7Dl7ZI1VUxjY1bmOPPWXihGSnr1P5/BjUYEoXxjDeBQ8HwKqxSvVBjbOSIygwtva89yVzPWm30Ts5gaOCRLkv5mO8q0=|tkp:Bk9SR764xfzfYA
I did. IMO and in my system, there is no comparison.The TS KT 170 takes my system far beyond what I heard with the KT88. In fact my KT 88 will soon be for sale.I also have Genalex KT 77 which also didn't pass muster with respect to the KT 170.But again I believe all of these vary from system to system. I looked for the best sound in my system which was the KT 170 rather than the KT 88Anyone try NOS Genelex KT88s?
Also, how would you describe KT88 vs KT170 sounds?
Site Founder | Site Owner | Administrator
Site Co-Owner | Administrator
|Julian (The Fixer)|
Website Build | Marketing Managersing