High Efficiency Speaker Asylum

Posted by Neff on November 25, 2008 at 20:39:15

In Reply to: RE: "I simply stated I do not care for them." posted by castironandtubes on November 25, 2008 at 17:59:06

12AU7's in the signal path will not represent what I am seeking to hear thru the speakers. So, why would I use that 12AU7 post as a reference?

I do not consider 12AU7's the ultimate performer as the tube performs with slight smearing of the audio- more so in very common RC coupling, less so in not so common cathode follower. Some call it warm sounding. Not so great in a home entertainment amplifier & especially so for voice. I like to hear accurate & clear open sonics with being musical at the same time. This does not dismiss others do not like 12AU7s and if they hear greatness, I am pleased they are in high spirits. I seek a different direction with my experience.

I have performed A/B tests with five listeners over the years in different amplifiers. All reported the 12AU7 from various manufactures was veiled vs the E80CC. Same with a few 6SN7's with an octal to 9-pin adapter. That is interesting, but I do not normally post findings like that. Kind of unscientific, you think? The 12AU7 tube was in part developed for Collins Radio back in about 1946-47. It is interesting Collins Radio requested RCA to improve the tube for lower distortion and that resulted in the 5814 tube. But, whatever. Perhaps the Collins engineer was wrong along with RCA as applied in certain audio amplifiers.

You still have not explained why you think the 12AU7 is a high quality tube as applied by vintage amplifier designers with 'high credibility'. That is because you can not explain it and apparently have not established other points of reference. For you to apparently suggest establishing a point of reference that can serve the many is impossible is rediculous.

How about your credibility sir.