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I made further experiments and listening and now I have concluded that I am very comfortable Yamaha T-85 Multiplex decoder and I have sold it to use it as a default multiplex for Rohde & Schwarz EU-6201. I made a few modifications in T-85 Multiplex:

1)    Eliminated AM access to Decoder
2)    Eliminated muting section
3)    Eliminated capacitance coupling with output
4)    Very dramatically droped output impedance
5)    Eliminatee input capacitor  - there is no DC from Rohde & Schwarz
6)    Replaced all important caps and resistor in the T-85 circuit with RN55, Muse …. (marked as blue)
7)    Eliminated the dependency of channels separation what T-85 switch to super-wide mode
8)    Max out the Pilot signal's attention
9)    Recalibrated the channels separation based upon the Rohde & Schwarz’s composite signal
10)   Added a jack for composite signal input

It ended up-to to be a very beautiful, completely-direct coupled circuit.

As now the Rohde & Schwarz + T-85 sound just wonderful and I would not look for other Multiplex Decoders with exception of a future idea to built one even better (with L de-emphasize)  INSEDE of the Rohde & Schwarz. So, effectively so far the Decoder project is over.  Probably the most reasonable question would be to ask how the Rohde & Schwarz + T-85 Decoder sound in relation to TU-1X. I have the judgment and it is much unexpected judgment at least to me. I will post it later on in the Rohde & Schwarz’s thread along with some commentaries.

http://www.romythecat.com/Forums/ShowPost.aspx?postID=7369#7369

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