IRFP140 and IRFP9140...anyone tried them in Aleph J or F5T?

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kilohertz

kilohertz

Member
Joined 2006
Hi Guys,

I have a line on some freebie parts...which is always good, and am wondering if the IRFP140 would be okay in the Aleph J, I am thinking it will be fine as the main difference is in voltage rating, Ciss is about the same @1400pF. Second, would this pair work in the F5T V2 or V3 if I keep the rails below 50VDC? I would like to build the V3 with the 8 outputs per channel. I know the 240/9240 are available, but the Fairchild parts are EOL and when free stuff comes along, it's nice to be able to use 'em.

Your thoughts?

Cheers

Paul
 
kilohertz

kilohertz

Member
Joined 2006
Ahhh, Nelson,

Thank you so much for stopping in and letting us know we have options. Much appreciated. I have many torroids from past projects, mostly the same dual 17VAC @ 6A and 24 VAC @ 8A windings, tag says 200 and 319 watts, so I can parallel or series them as required for the Aleph J or F5T V3. Should see about +/- 30VDC for the Aleph J and either +/- 35 or 60VDC for the F5T. Here is the thread I started, trying to decide what to build next, Aleph J, F5T etc.

http://www.diyaudio.com/forums/pass...-15-years-passt-projects-amp-build-first.html


So on another note, I am still about to rebuild the Stasis II, which I have had apart for over a year now. Finally have all the new 48 outputs and drivers etc. See my other thread...

http://www.diyaudio.com/forums/pass-labs/198286-threshold-stasis-ii-help-needed-please.html

Also sometime this fall/winter, I need to build a preamp based on one of your designs, be it a BA-3 line stage or ???

I must restrict myself to only 3 projects at a time. :D:headbash:

Thanks again!

Cheers

Paul
 
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Bikeman

Bikeman

Member
Joined 2003
Gyuri

Gyuri

Member
Joined 2003
Yes. I'm a fearless burning amplifier builder.
I'm worried about the 2SJ74/2SJ108 JFETs because of 25V GDS.
I don't have countless pieces of them.
But they are survive.
I must to say, I can't perform a comprehensive test with this configuration, depending lack of a proper preamp. It wasn't a really dynamic condition test.
So, perhaps these delicious devices don't survive, if I can put to them a full voltage swing.
I can say, I never ever burned any of Pass designs.
Despite of that I always push the limits.


I think, IFRP9240 and IRFP340 will be fine.
But I'm not an expert.
 
Triodethom

Triodethom

Member
Joined 2009
Gyuri said:
Yes. I'm a fearless burning amplifier builder.
I'm worried about the 2SJ74/2SJ108 JFETs because of 25V GDS.
I don't have countless pieces of them.
But they are survive.
I must to say, I can't perform a comprehensive test with this configuration, depending lack of a proper preamp. It wasn't a really dynamic condition test.
So, perhaps these delicious devices don't survive, if I can put to them a full voltage swing.
I can say, I never ever burned any of Pass designs.
Despite of that I always push the limits.


I think, IFRP9240 and IRFP340 will be fine.
But I'm not an expert.
Click to expand...
On the youtube video of burning anp thing in 2010 Papa states that the absolute max on the 2sj74 is 43 not 25 volts so I think you are well with in the real limits on it as well as the for the 170 . For that mater neither an I the expert on this.
 
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