Measure your gate leakage current. I had one channel that would biased up because the gate legislate current wad high enough that voltage drop across the 10k resistor wouldn't allow Vgs to excced 1 V
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Sent from my C6903 using Tapatalk 2
Hi AOC, this is the part where I confess, that I'm a novice in electronics... Care to explain how to measure the gate leakage current? ...and if that doesn't measure up to spec, what would the fix be? Thanks!
Ok my first hints were not fitting.....
Before omitting the 10R pots you could adjust the 1.5A?
And now without no more?
You drive Semisouth or IRF?
Why not adding one LED more in the problemati channel? You get more voltage for biasing and you can possibly adjust your 1A5
Or what about measuring the voltage over both LED strings if they are equal?
When you add another LED turn first down the current in the actual arrangement otherwise.....Ploppp!
Before omitting the 10R pots you could adjust the 1.5A?
And now without no more?
You drive Semisouth or IRF?
Why not adding one LED more in the problemati channel? You get more voltage for biasing and you can possibly adjust your 1A5
Or what about measuring the voltage over both LED strings if they are equal?
When you add another LED turn first down the current in the actual arrangement otherwise.....Ploppp!
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I have a run of F6's with the Mosfets (believe it or not, most of my
listeners prefer them over the JFETs in this application) and I use
6.25V references for the biasing, formed by TL431's.
😎
listeners prefer them over the JFETs in this application) and I use
6.25V references for the biasing, formed by TL431's.
😎
IRFP240 are as good as any in this regard.
Be sure to include Gate stopper resistors and some
Source ballast resistors, maybe 0.47 ohm.
😎
Be sure to include Gate stopper resistors and some
Source ballast resistors, maybe 0.47 ohm.
😎
What are the differences between Mosfets and Jfets as far as sound quality in the F6 application?
And in what application does the Jfet win?
Rush
PS, thank you for all that you do for this community. Very greatful.
Thanks for the information. I find it interesting that going back to Mosfets is preferable now.
Do you think this has to do with increased gain and DF? I think the IRF best the SS in this regard, correct? I am assembling a mosfet version of the balanced F6 and will compare.
My setup with F6 and IRF's was a much more golden relaxed sound.
The SemiSouths had less distortion, more sparkle and a devine top end. But not a lush mids like the IRFs. When trying to add more K2 with pots and source resistors to R100's, it lost the top end magic for me.
But that's only me.
The SemiSouths had less distortion, more sparkle and a devine top end. But not a lush mids like the IRFs. When trying to add more K2 with pots and source resistors to R100's, it lost the top end magic for me.
But that's only me.
Well, same when I played with the ACA and swapping Mosfets with SS, all my friend preferred MOSFETs. I guess for the coloration they introduce... very lovely 🙂
SS are yesterday's news. That makes them easy to dislike. Either way, I like the concept, so I am quite happy at the potential improvement in sound.
thanks , but yes
I like SSouths
though , I like IRFPs , too ......... when I don't have SSouths
😉
I like SSouths
though , I like IRFPs , too ......... when I don't have SSouths
😉
