2. amps-preamps
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do i change the preamp or the speakers?

I recently acquired a set of Odyssey Stratos Monoblocs (w/ upgreaded cap) which i run through an Audible Illusions 2d with new tubes from AI. This set drives my Kef 104.2's. i use some streaming through an Adcom DAC but mostly i listen to vinyl on my Thorens TD 160 with Shure cart.

Before the Stratos arrived i was driving this Kef's with an older Bryston 3B and it was nice.

The Stratos betters the bryston in all ways but the Bryston was "brighter" and suited my listening tastes better when using the Kef's. This new combination is too warm for me. In fact i find the combo of the Stratos and AI sound better driving my IQ TED 400's which are a brighter speaker. I have also substituted my old NAD 1155 solid state preamp which is not the same class as the AI but the slighter brighter nature and the ability to adjust he tone and loudness for lower listening levels has me switching back and fort between the two preamps.

So the question i have is this. Do i change the speakers or do i shop for a replacement preamp.

if it matters, i am a fan of rock music.
fivefasts

Showing 3 responses by lowrider57

lowrider57's avatar
lowrider57
5,418 posts
 
The great thing about a tube preamp is that you can substitute the stock tubes with tubes of different sonic signatures. You can roll tubes to make your preamp have a different timbre, in your case you need tubes that would provide more air on top or a higher frequency extension.

Here is some good reading regarding the different manufacturers and the characteristics of their tubes. These are NOS tubes which would most definitely provide you with the sound you seek. One tube that comes to mind is a RCA Cleartop which has sounds open and airy on top.

[url]http://www.audiotubes.com/12au7.htm[/url]

BTW, while you are learning about NOS tubes, let your AI stock tubes burn-in for at least 60 hours before you judge them.
lowrider57's avatar
lowrider57
5,418 posts
 
As usual Al has provided excellent advice especially changing the cartridge loading. I also believe that the Bryston has a brighter sonic signature than the Modulus.

I may have spoken too soon regarding the use of NOS tubes. AI states that the proper selection of tubes is critical and makes recommendations.

http://www.audibleillusions.com/technical/

In any event, allow your stock tubes time to burn-in before making any decision on a new preamp.
lowrider57's avatar
lowrider57
5,418 posts
 
Fivefasts, I don't believe there is any plate voltage in the tubes during standby, so the preamp must be powered-up for the tubes to generate current and burn-in. And, it doesn't need to be playing any music so the amps can be turned off.
Anybody feel free to correct me if I'm wrong.
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