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Re: Morrisons "Siren Song" preamp

Posted by julioiglesias on November 28, 2000 at 09:00:11

In Reply to: Re: Morrisons "Siren Song" preamp posted by L.D. Moore on November 28, 2000 at 07:35:04:

Thanks for your comment,

I was not aware of different versions of the "Siren" (besides of two published in Sound Practice)! The one I build is from Sound Practices issue Summer 1993 (page 16). I only modified the PS, the last stage is a paralled 6N7. What about replacing this stage with a 1:1 output transformer (balanced). Is it then posible to change the second riaa stage into a balanced design like the first stage.
I am aware of the interaction between input impedance of the last stage and riaa filter but I am not very sure where the second part of the riaa eq ends and where the coupling of the last (6N7)stage starts (as I said I am a greenhorn).
Unfortunately I am no electronic or tube expert to design these changes by myself. Where can I find more/help information on the Siren Song?

regards
Antonio

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