abbey road d enfer said:
- It would cost nothing to the manufacturer to change this cap; then, why don't they do it? I guess there are enough people who like the added sizzle...
Because it's typical chinese factory circuit, modified only to use dc converter. No one bothers how it sounds
kingkorg said:2. In this case they just followed blindly u87 schematics, even with some blank spots. Like Piotr said, didnt even bother to bias the fet, so even with 220pF doesnt work as it should.
Matija, to be clear - one thing is that unbiased fet makes a nasty repsonse - other thing is that the whole bias circuit don't fit deemphasis network - that's why it only works with higher capacitance.
If you will change biasing to the same as in U87, then it will work with 220pF.
Left - chinese biasing, right - U87