bcarso
Well-known member
[quote author="ribarr4"]Hi all. I have been watching this forum and am glad to finally be able to contribute.
The Dorsey diagram is incorrect, but because of that when I was designing DOA several years ago I did a bit of extra testing. I turned all of the sk170s & sJ74 around (and there are 7 all together) and it speced' out exactly the same and passed audio exactly the same. There is supposed to be a difference because the channel is asymetrical and I suspect that will affect certain applications, but made not an ounce in my design.
Richard[/quote]
Welcome to the realm of posting Richard.
Yes, your experience would be what I would expect for almost all applications. Where a little bit of asymmetry in capacitances would show more pronounced effects is indeed in capsule preamp input device applications, but for "everyday" amplifiers every JFET I've seen is for all intents and purposes symmetrical.
The Dorsey diagram is incorrect, but because of that when I was designing DOA several years ago I did a bit of extra testing. I turned all of the sk170s & sJ74 around (and there are 7 all together) and it speced' out exactly the same and passed audio exactly the same. There is supposed to be a difference because the channel is asymetrical and I suspect that will affect certain applications, but made not an ounce in my design.
Richard[/quote]
Welcome to the realm of posting Richard.
Yes, your experience would be what I would expect for almost all applications. Where a little bit of asymmetry in capacitances would show more pronounced effects is indeed in capsule preamp input device applications, but for "everyday" amplifiers every JFET I've seen is for all intents and purposes symmetrical.
