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HiAn update on my recent tube rolling experiments.I got the Tesla gold-pins with the 32 factory code, and the Siemens goldpins (supposely from the sixties).The Tesla are nicely balanced and do everything quite well: Have nice bass, slam, voices are seductive. They may not be top in each category, for example the Tungsram are more airy, have better texture in the bass, nevertheless they represent an excellent value.The Siemens are remarkable in their way. They offer high resolution and provide a lot of texture to each instrument and/or sound. Bass is solid too. They do not sound harsh, but in a way lack a bit of "magic" or intimacy. However, in their way they are very nice, especially for classical music.While these observations are reproducible with my individual tube pairs (I used the same music for the comparisons), I do not know how representative they are for a whole brand or production batch.I am looking forward to the Amperex 7308.
I do not know how representative they are for a whole brand or production batch.
Also, unless you know you are getting a good pair of tubes - low usage, matched (or close to it!), up to specs, etc.
Best tube ever (sorry to say) are the most expensive Siemens Cca from the late 50's !....... I have tried almost all tubes in the ECC88 family, and must say that most are wast of valuable time compared to the Siemens Cca !...... If you want to check this wonderful tube out; then please be aware to have the right stuff (huge difference) !......
Quote from: carsten_chr on 20 Sep 2008, 10:12 pmBest tube ever (sorry to say) are the most expensive Siemens Cca from the late 50's !....... I have tried almost all tubes in the ECC88 family, and must say that most are wast of valuable time compared to the Siemens Cca !...... If you want to check this wonderful tube out; then please be aware to have the right stuff (huge difference) !...... Did you also try a Telefunken CCa? When you say "the right stuff", you refer to forgeries, or Siemens CCa from later (70s)? What are the diagnostic traits of a Siemens CCa from the late 50s?Thanks!
I just recieved the Amperex 7308. I only got a chance to spend about 15 minutes and only one peice of music with them so far. I listened to Ammie Mann and all I will to say at this point is it is a huge improvement over the stock tubes in my system. I will try and post more details after I get some more time.
But the Siemens Cca's (from late 50's to first 60's) just have a touch more of air, 3D, naturalness - just sound right !.......
If you have some Siemens Cca's and you don't know if they are the right stuff, then please feel free to sent me some detailed pics of each of them. I then study the tubes, and tell you what you have !........
You have to ensure that both of the tubes are measuring 100 %, and that none of them have any problems with noise and microphonics !.......