I just posted on another thread about my new Musical Concepts Chameleon preamp, so sorry to anyone following both.
It utilizes interchangeable "daughter boards" to allow users the option of quite a variety of different tubes, hence to be able to tailor the sound of the preamp. Why have just "A" sound, when you can change boards/tubes and have several. Quite an impressive idea. Also, the output impedance is variable by board/tube selection.
http://www.musicaldesign.com/MC_Cham.html
It utilizes interchangeable "daughter boards" to allow users the option of quite a variety of different tubes, hence to be able to tailor the sound of the preamp. Why have just "A" sound, when you can change boards/tubes and have several. Quite an impressive idea. Also, the output impedance is variable by board/tube selection.
http://www.musicaldesign.com/MC_Cham.html