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Keeping harassing different people bout the most interesting options for multiplex decoder for my Rohde & Schwarz EU-6201 I was wondering if it makes sense to me to use the Rohde. It is a very good tuner but it is not necessary result in better sound that I got from Sansui TU-1X. My antenna setting is optimized for Sansui’s idiosyncrasies (read limitations) and paying with antenna setting I was able to get from Sansui similar to the Rohde & Schwarz quality of reception in wide mode.  Rohde did fine driving my second “experimental” Sansui’s TU-1X MPX decoder but after many tests I feel that my fist TU-1X juts sounds better and I do not want to modify it to accent the Schwarz’s external composite signal – I do not want to lose accidently what my first TU-1X does as I feel that it is unique in a way.

Recently talking to Dima about the options to use or not to use the Schwarz and collaborating the MPX decoders, Dima mention that Yamaha T-85 has a very interesting decoder. He feels that is it very elegantly designed from his perspective and it might be interesting. I took the Yamaha T-85, it turned out to be a nice tuner with not especially attractive sound show to Dima the circuit and he proposed that it will take 60 minutes to converts it into a standalone multiplex decoder. The way how the tuner made it is so ease and accessible that it took for me 15 minutes. I made just a few modifications in order to connect the Rohde & Schwarz wide-bandwidth output (7V!!!) and trash all Yamaha output muting section. I did not use anything else like change op-amps, resistor caps for something better – it was just basically stock Yamaha tuner  with a surgically injected compose signal from outside right after the Yamaha’s Intermediate Frequency section. I use the chipset cables possible, inciting the 1M Multiplex cable from Rohde & Schwarz to Yamaha’s new made Multiplex input. I got rid the caps after the Yamaha out stage – it has 95mVDC – who cares!

OK, here is the story… it sounds beautiful. I actually can’t believe how nice it is. My initials feeling that the Yamaha T-85’s MPX decoder actually sounds better then TU-1X’s decoder. Would you believe me if I say that it has more bass and more dynamic? I did not listen it very careful as I have no worthy programming tonight and I have to run now but the initial sentiments of using the Yamaha T-85 as the Rohde & Schwarz’s multiple is VERY positive.  I need to do more test, including running my transmitter into both tuners and do some measurements but so far is very promising…

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