repro's mod should stay in this level for a while
Since last time ,modified A80's repro card's C18.C30 by pass caps of the second stage with great up grade of sound, there are so many caps using in the first and second stage ( last output stage had been converted to tube and transformer so no coupling cap in using) and they works as coupling or by-pass, different construction of caps has their own sound character specially working in sound path coupling with big effect , C8 C16 C19 is the coulping, stock was using polarity Tantalum 47mf and 10mf, non polarity cap in 47mf must be very big in size only metallized plastic cap can make that so we converted three of them to Solen metallized long time ago that sound much better, but to-day Mundrof make silver/gold/oil metallized cap in same value , after we replaced Solen to Mundrof , that sound even more better, with oil in, sound more smooth . next,we add on Jansen paper in oil copper foil 0.47mf and 0.01mf multi cap (polypo) to C19 C16, it came out sound more clear but too much in high frequency with cool that cover the oil cap's smooth and warm sound, finally we took off the Multi cap then got the sound which we like better,C8 is the output coupling of first stage is more sensitive than other two caps C16 C19 so beside the Mundrof silver/gold/oil , we added a Jansen silver foil paper in oil 0.1 to it and got the best result. finally we did the same thing of C18 C30 to C3 C9 too which is the by pass cap of first stage, right now this is the best sound we had heard so far and will keep it on for a while because no ideas for more modification . maybe it is not Studer's sound any more but for our tape copy quality will have a big jump and will be noticed by our future copies
tony ma
