 
|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
|
|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
hi, i ran across these fets are they good to use for class a bias on ad825s and ad8610s? any help greatly appreaciated, ALLEY-KAT
Follow Ups:
exactly what's your application? amp? dac?
2SK170 is good in that it is low noise, high
Idss and high gm with the cost of high
input cap'. If low input cap' is vital, try
2N5459.I'm not sure on NOS JFETs. I don't know them
very well. Do you? Do tell me some good ones.
For my app', I need high Idss
hi, thanks for the response, i used the fets in my power amp, and preamp on the ad825s, and ad8610s, and they seem to sound pretty good improvement for sure. there running around 1.46ma. as for the fets you were asking about, i'm pretty new to alot of this so i'm not much help on that sorry but, there is alot of good help on this forum. i'm sure you will find what your looking for. thanks again, ALLEY-KAT
I do know amp circuit design pretty well and I'm
more than happy to help you especially because my
passion is on JFETs.If you want people to help you, you need to tell
them about the circuit details and it's appl'n.
If it is for an amp, it sounds like you are trying
to bias the opamp into class A.James Yung
Praise! Professional Audio equipments
hi JAMES, i sure forgot to add the fact that it was for op-amp bias. i put it in a recent post, but i sure forgot this time sorry. yea, i'm on so much medication, i tend to forget alot. the amp and preamp seem to sound alot better now but any other tips are welcome. i've mostly done power, modulation,channel mods,etc. on ham, and cb radio.i never knew these forums were out there for a long time but they sure are great! best reguards, ALLEY-KAT
I'm on medication as well; you are not alone.
Do you mean biasing the opamp in class A with
the method of tangentsoft? If it is so, 2SK170
give better sound because it has a higher Idss
than 2N5484. In fact, I think 170 has the highest
Idss in the markert. Anyone please confirm/correct?
Don't over do it cause otherwise you will switch
on the current limit circuitry of the output stage.
It will almost certainly blow up the opamp. Also
opamp will be at high temp' which is not good.
I have a method of ensuring the opamp is in class A
without lowering the supply voltage. All you need
is 1 single component. If you want to try out, I'm
happy to tell you. Just send me a email to my private
email address.G'day ! from Australia
James
Praise! Professional audio equipments
This post is made possible by the generous support of people like you and our sponsors:
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2025, Audio Asylum, all rights reserved ]
