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Old 16th June 2006, 10:22 AM   #1
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Default Transistor question: IRF9610 vs SFP9610?

Hello, finally the first part of my components for an Aleph 5 arrived, including 20 pieces of 9610 series Transistors. Now I actually specified IRF9610s and made the comment on my order that I'd love to have them from the same lot, but in any case from International rectifiers, but what I actually received were nevertheless Fairchild SFP9610. My question now: Are they also suitable for use (of course they are in a technical sense, since they are the same transistor type, but what about the musical qualities?), or should I return them without looking back?

Thanks a lot in advance,

Chris
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Old 16th June 2006, 06:58 PM   #2
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My experience is that the Fairchild P channel devices are superior
to the IR (and seem to be equivalent for N channel). I don't see
any reason you shouldn't use them.

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Old 16th June 2006, 07:02 PM   #3
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Ok, thanks a lot... So I think I will start to get into the business of matching them now!

Chris
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Old 16th June 2006, 07:07 PM   #4
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Nelson, are you referring to the "funny" (we're not laughing) linear region behavior you documented for some of the IR devices? Is this behavior unique to IR?
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Old 16th June 2006, 11:23 PM   #5
flg is offline flg  United States
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I thought I had a bk-mrk of that thread, the exchange with N.P. and a couple other "Guru's" of the subject... Very interesting reading. I'll look more later.
I have never heard an IR 610 part I always get Faichild... If I remember correctly, the gain of the Fairchild 610 is a tad higher and C a tad lower??? Everything I ever expected, always worked just like I expect. Or maybe more correctly, Just like N.P. said... But I also wonder about the P ch weirdness thing??? I have a few of those 9610s still in a bag...
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Old 19th June 2006, 05:50 PM   #6
Mad_K is offline Mad_K  Norway
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I have used Fairchild SFP9610 for Aleph 3, and they worked very nicely
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Old 19th June 2006, 06:17 PM   #7
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Quote:
Originally posted by wrenchone
Nelson, are you referring to the "funny" (we're not laughing) linear region behavior you documented for some of the IR devices? Is this behavior unique to IR?
Yes. The IR P channel parts have a slightly odd gain shelving
behaviour. It's not a big deal, but the Fairchild and others
don't have it, so they get the nod in Common Source applications.

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Old 15th November 2006, 08:08 PM   #8
yup is offline yup
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Well, now the Fairchild part has been discontinued...

They list the FQP3P20 as a replacement. Unfortunately I do not have the ability to measure the frequency response of this device.

Can anyone make any reccomendations or have any experience with this part (or another brand)?

I am building the Aleph-x with the 044's (slightly dark top end), so I am guessing that the frequency response of the IRF9610 is not a good compliment.

Thanks,
Jeff
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Old 15th November 2006, 08:26 PM   #9
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We used them successfully for years, but the Harris or
Fairchild versions have proven to have a little less distortion
as input devices. It is not at all a given that the amp will sound
darker.

This could change at any time if IR changes its process, as
no other mfr seems to have this phenomenon on what are
supposed to be the same parts.

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Old 17th November 2006, 03:23 AM   #10
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On the same topic I grabbed a tube of IRF9610 with the Samsung 3 star logo (-Korea-) a while back.

Junk?

Edit: Oh, a quick search turns up that Fairchild bought the semi stuff from samsung ~1998. All good I guess.
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