this time curiosity didn't killed the Cat 
btw. I'm finding Vishay sound in M2 pretty seductive
btw. I'm finding Vishay sound in M2 pretty seductive
It is expected that the offset keeps moving a little bit around. If you blow on the MOSFETs it will vary more, but then come back to where you had set it.
Once you start tonight's listening session don't be too surprised when you realize it is already 2:00 AM and you did not see the time go by.
😀
Once you start tonight's listening session don't be too surprised when you realize it is already 2:00 AM and you did not see the time go by.
😀
It just occured to me that vishay may have merged both IR and Silconix parts under the same irfp part number.
Anyone know if this is true?
Either way, no one ever talks about siliconix, have they ever been tested by anyone here?
Anyone know if this is true?
Either way, no one ever talks about siliconix, have they ever been tested by anyone here?
If I had access to a Keysight U8903B, I would measure some in a test circuit and publish the results.
😀
😀
I am sure you already have it printed and plastered on a wall, but here is a link to the relevant article anyway.
http://www.firstwatt.com/pdf/art_mos_test.pdf
http://www.firstwatt.com/pdf/art_mos_test.pdf
Yes by Mr Pass
in article about mosfets testing.Page text and graph show by courtesy of First Watt
http://www.firstwatt.com/pdf/art_mos_test.pdf
Attachments
I'm certainly not losing sleep over this one. I'm just curious about the Siliconix parts.
I've been using P channel IR parts for years now without issue.
I've been using P channel IR parts for years now without issue.
I try both Siliconix IRFP9240 and Harris and i agree with Papa conclusion.
Nothing to be excited too much about it 🙂
Attachments
Those parts Nelson is referring to in that article are not Siliconix parts.
They are the original International Rectifier parts.
What I am wondering is if there are differences between Siliconix and IR.
Vishay now own both product lines.
To be specific, I wondering if there are differences between Sihfp9240 and irfp9240
They are the original International Rectifier parts.
What I am wondering is if there are differences between Siliconix and IR.
Vishay now own both product lines.
To be specific, I wondering if there are differences between Sihfp9240 and irfp9240
Last edited:
Yes, they have not original IR package logo, but inside is the same.
IR = Vishay= Siliconix
Vishay - Company Info - Vishay History
the stuff we find at Mouser for example are IRFP9240PBF and is RoHS compatible now.
This new Pb free version don't mean is not the same old IR semiconductor technology line product inside.
Vishay is packaging and this Guy's doesn't invest any money to make them perfect for audio
because this applications is not the big market place purpose.
Equivalent transistors can do the job and Rochester 8K pcs of Harris wait for Diyers.
Could we find some IXYS brand pairs maybe for M2 ?
Attachments
I know IR = Vishay
But does IRFP9240 = SIHFP9240 ? That is, are they manufactured from the same plant to the exact same procedure and materials using the same manufacturing equipment.
But does IRFP9240 = SIHFP9240 ? That is, are they manufactured from the same plant to the exact same procedure and materials using the same manufacturing equipment.
Last edited:
SIHFP9240 only place i know is in Vishay documentation,
don't see any specific SIFP transistor reference we can buy somewhere.
don't see any specific SIFP transistor reference we can buy somewhere.
Is the difference soooo big?
Is there someone who can compare apples with apples?
They are different PCB's; someone use WIMA coupling caps, an other SILMIC; DALE or standard metal film, power supply differs...
JP
Is there someone who can compare apples with apples?
They are different PCB's; someone use WIMA coupling caps, an other SILMIC; DALE or standard metal film, power supply differs...
JP
I like IXTQ36N30P and IXTQ36P15P, which seem a pretty good match to me. Kind of like two IRFP240/IRFP9240 glued together in one package, but with higher transconductance and a better junction-case thermal resistance.
Haven't tried them in an M2, though they are currently serving nicely as source followers in another of my amps.
Hmm - I always passed right over the M2 because I ASSumed the transformers would be costly.
D'oh
edit: removed idiot question
D'oh
edit: removed idiot question
Last edited:
Yes, and I have a few thousand of them. Same chip as the plastic.
That character of P channel types was an IR phenomenon - Harris and
Samsung and a couple others do not exhibit the transconductance shelf.
I seem to recall that at one point Samsung parts were acquired by IR,
so there were examples of IR parts that didn't have it.
The IR parts work, but you can measure a difference, which shows up as
an alteration in the distortion character between lower and higher
frequencies. Not a big deal, more of an issue for no-feedback amplifiers
and Common Source use.
Last time I tested Vishay IR's, the parts behaved the same as earlier.