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Tubes in the preamp stage......specifically two simultaneous preamps before the amplifier

I have a Peachtree Decco integrated amp that has a tube preamp stage. I have never been able to hear the difference with the tube on or off. Because I previously had a tube amp and loved the organic quality of sound, I decided to insert a well-reviewed ifi I tube in the chain after the Peachtree but before the amplifier. Instantly I can hear the itube's tube sound. Anyone know why it is inaudible in the Peachtree? I've even upgraded the tube in the Peachtree to an Amperex and still no difference.
Also, I had Audirvana Plus previously installed and running and it totally negated the sound of the tube in the ifi itube. Got rid of Audirvana and tube sound returns. Any reason as to why that would happen is also appreciated.
Thanks for help!


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Topic - Tubes in the preamp stage......specifically two simultaneous preamps before the amplifier - wolters_jason@yahoo.com 06:44:31 09/30/15 (7)

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