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Boutique Bi-polars?
Boutique Bi-polars?
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Old 2nd December 2002, 12:05 PM   #1
setmenu is offline setmenu
diyAudio Member
Join Date: May 2002
Location: UK
Default Boutique Bi-polars?

Just wondered about this since there are 'exotic' caps, resisters
wire etc .
How about bi-polars etc I do not recollect hearing of super
expensive active 'audiophile' components?

I suppose this sort of thing would be harder to market as a simple
upgrade etc.

Do forgive me if this has been covered before [most likely buried
somewhere here!]or seems an ill informed question as I am new to this field.

Just curious as to what people have to say say in light of the recent tweak threads regarding skinning caps, solder ,silver etc.

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Old 2nd December 2002, 04:24 PM   #2
jcarr is offline jcarr  United States
diyAudio Member
Join Date: Jul 2002
Location: Tokyo, Japan
Some semiconductor manufacturers will make custom FETs for you, if you wave enough money in front of them.

You can also get raw BJT, JFET, MOSFET et al dies and have these exotically repackaged. Again the outcome depends on how much money you are willing to spend.

Even IRF offers special hermetically sealed can versions of certain MOSFETs, some radiation-hardened; others with internal BeO themal pads that allow the device to be mounted directly to an electrically conductive heatsink.

Devices like the IRFM240, IRFY240c, IRFM9240, IRFY9240c (to name a few that could be used in Pass Labs designs) go for something like US$50~60 each, if I recall correctly.

hth, jonathan carr
http://www.lyraconnoisseur.com/, http://www.lyraaudio.com
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Old 26th December 2005, 04:19 AM   #3
angel is offline angel  Norway
diyAudio Member
Join Date: Oct 2003
Location: Norway
InterFET and a few others specialize in this sort of thing: low quantity orders of custom JFETs (in their case, others supply bipolars or what have you).
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