OK. Can you interpret this? (Try blowing up the photo)
OK, I remember that now. Thanks!Essentially, the outputs of the all of the low level stages have a capacitor in the signal path, e.g., Flat Amplifer (see post #14), MM Amplifer (see post #15).
It's sad that electrolytics are in the signal path!Yes, the C43/C44 film by-pass capacitors can be replaced with 1.0µF polycarbonate types. Replacing the C55/56 and C57/58 polarized capacitors in the output to bi-polar types will likely have a larger sonic impact than just replacing the film by-passes alone.
The output coupling capacitors are part of a RC high pass filter. For example, in the Flat Amplifier (with tone controls defeated), the F3 of the RC filter with the stock 50µF capacitance and 1.63 kohm resistance (R47/48 + R07/08 + R09/10) is ~1.95Hz (the pass band needs to be <5Hz to minimize phase shift in the midrange). Installing a film instead of the jumper, places it in series with the electrolytic capacitor and results in much lower effective capacitance (and increases the F3). For example, a 1.0µF film in series with the 47µF bipolar electrolytic capacitor results in an effective capacitance of 0.98µF and a F3 of 100Hz.Lee, What do you think of this? When using one bipolar in the place of those two,...instead of using jumpers in those empty places,...use a high grade film very low value in it's place.
Sansui has already specified film by-pass capacitors for the output electrolytic capacitors, e.g., C17/18 in the Flat Amp....Or maybe bypassing that bipolar with a film cap. Perhaps on the back side of the board?
But for the MM board. Any film bypass for those nonpolars?
OK, are you saying c43&44 are bypasses for c55-56-57-58?C43 and C44 are the film by-pass capacitors on the MM phono stage.
OK, are you saying c43&44 are bypasses for c55-56-57-58?
OK, I put 1uf polycarbonate caps in c43&44. The only difference in sound is the vocals are (maybe) a tiny bit clearer. The mids and highs may be a little softer. Thought you would want to know.