6h5c said:
I wanted the input stage to be as balanced as possible, so for the input stage I matched the resistors and the BC550's Hfe with my transistor tester, but I don't have a tool for FET's. And besides, I only have the four that originally came out of the HDAM.
It cancels the noise that's common in both DAC outputs, so a good balance doesn't hurt.
Ray.
The 2sk389's are matched pair (one die)
was going to use them in a RIAA circiut
I also have some MAT02's /3's (sample's hint)
BC550's are good low noise tranny's and cheap too
There is a simple circuit for matching fet's on this site
i'll see if i can find it
allan
awpagan said:The 2sk389's are matched pair (one die)
was going to use them in a RIAA circiut
I also have some MAT02's /3's (sample's hint)
BC550's are good low noise tranny's and cheap too
There is a simple circuit for matching fet's on this site
i'll see if i can find it
allan
Ah, just like the ones used in the CD63's HDAM, 2SK332. Nice!
Ray.
6h5c said:
fet matching if anyone wants to try
http://www.passdiy.com/howto/matching.htm
just for interest
http://www.diyaudio.com/forums/showthread.php?s=&threadid=34191&highlight=
Balanced in and/or out
preamp useful for ideas
http://www.diyaudio.com/forums/showthread.php?s=&threadid=54826&perpage=10&highlight=&pagenumber=2
allan
Hi Allan,
Cool links, thanks! I haven't been into solid state lately (gross understatement...) so these are very helpful.
I spent four hours listening last night, to determine the difference between two players (opamps vs. passive + transistor stage) and the winner is absolutely the transistor stage. The soundstage is more accurate, with better to pinpoint instruments. I thought I had lost some air or space, but it's there when it is supposed to be. With the opamps there seems to be more space all the time, and that sounds very cool at first. But it seems to lead to somekind of smearing in the soundstage, which makes everything less easy to pinpoint (am I still making sense???).
Regards,
Ray.
Cool links, thanks! I haven't been into solid state lately (gross understatement...) so these are very helpful.
I spent four hours listening last night, to determine the difference between two players (opamps vs. passive + transistor stage) and the winner is absolutely the transistor stage. The soundstage is more accurate, with better to pinpoint instruments. I thought I had lost some air or space, but it's there when it is supposed to be. With the opamps there seems to be more space all the time, and that sounds very cool at first. But it seems to lead to somekind of smearing in the soundstage, which makes everything less easy to pinpoint (am I still making sense???).
Regards,
Ray.
.
