Trying to repair a Keithley 616 with a bad ranging board. It needs two
parts. One is a dual channel J-FET and is marked ITS30092; the other is
an op-amp with the markings ITS6214. Does anyone know of a cross, or even
who the manufacturer is? (Must be before my time...)

Thanks for any help!

On Wed, 07 May 2008 13:11:38 -0400, JW <none at (no spam) dev.null> put finger to
keyboard and composed:

Trying to repair a Keithley 616 with a bad ranging board. It needs two
parts. One is a dual channel J-FET and is marked ITS30092; the other is
an op-amp with the markings ITS6214. Does anyone know of a cross, or even
who the manufacturer is? (Must be before my time...)

Thanks for any help!

I'm guessing they are specially selected Intersil parts.

Have a look at the IT500-IT505 dual N-channel J-FETs:
http://www.datasheetarchive.com/pdf/1824055.pdf

Maybe someone has an Intersil catalogue or databook from around that
time (early 1980s ???).

On Fri, 09 May 2008 07:51:20 +1000 Franc Zabkar
fzabkar at (no spam) iinternode.on.net> wrote in Message id:
iur6249jf7tva5b2lunkgdjldmlvpcj4jh at (no spam) 4ax.com>:

On Wed, 07 May 2008 13:11:38 -0400, JW <none at (no spam) dev.null> put finger to
keyboard and composed:

Trying to repair a Keithley 616 with a bad ranging board. It needs two
parts. One is a dual channel J-FET and is marked ITS30092; the other is
an op-amp with the markings ITS6214. Does anyone know of a cross, or even
who the manufacturer is? (Must be before my time...)

Thanks for any help!

I'm guessing they are specially selected Intersil parts.

Have a look at the IT500-IT505 dual N-channel J-FETs:
http://www.datasheetarchive.com/pdf/1824055.pdf

Maybe someone has an Intersil catalogue or databook from around that
time (early 1980s ???).

Thanks Franc, Intersil makes sense. It's starting to look like I'll need a
donor unit.

On Fri, 09 May 2008 11:00:30 -0400, JW <none at (no spam) dev.nul> put finger to
keyboard and composed:

On Fri, 09 May 2008 07:51:20 +1000 Franc Zabkar
fzabkar at (no spam) iinternode.on.net> wrote in Message id:
iur6249jf7tva5b2lunkgdjldmlvpcj4jh at (no spam) 4ax.com>:

On Wed, 07 May 2008 13:11:38 -0400, JW <none at (no spam) dev.null> put finger to
keyboard and composed:

Trying to repair a Keithley 616 with a bad ranging board. It needs two
parts. One is a dual channel J-FET and is marked ITS30092; the other is
an op-amp with the markings ITS6214. Does anyone know of a cross, or even
who the manufacturer is? (Must be before my time...)

Thanks for any help!
I'm guessing they are specially selected Intersil parts.

Have a look at the IT500-IT505 dual N-channel J-FETs:
http://www.datasheetarchive.com/pdf/1824055.pdf

Maybe someone has an Intersil catalogue or databook from around that
time (early 1980s ???).
Thanks Franc, Intersil makes sense. It's starting to look like I'll need a
donor unit.

I would think that you could refer to the schematics in the manual ...

http://www.keithley.com/support/data?asset=5258

... and find a modern op-amp and dual J-FET with much better specs.

See http://www.intersil.com/products/pt/parametric_table_13437.asp

You may even be able to get a free sample:
http://www.intersil.com/samples/index.asp

Here are two dual N-channel J-FETs that may fit the bill:
http://www.linearsystems.com/datasheets/LS843-5.pdf
http://www.linearsystems.com/datasheets/LSK389.pdf

Here are more choices:
http://www.linearsystems.com/products.html#GlossD

You can request samples here:
http://www.linearsystems.com/contact_us.html

- Franc Zabkar