Dual FETs for differential pair

jwb · 25th May 2003, 11:37 PM

I am fairly tired of matching IRF9610s! Has anyone here tried using dual FETs for this front-end? Fairchild and Zetex both have promising-sounding parts (e.g. NDS9948, ZXMD63). These devices are obviously highly temperature coupled and produced from the same wafer, so they should be matched fairly well.

But, do they sound good?

Tomo · 26th May 2003, 01:31 AM

Hey,

Aren't they too small?

T

jwb · 26th May 2003, 01:35 AM

I'm only trying to dissipate about 300mW.

Nicwix · 29th May 2003, 12:24 PM

See NP's reply to: ...what about using a dual MOSFET, rather than worrying about matching discrete pieces

Regards
Nic

Nelson Pass · 29th May 2003, 07:39 PM

We use 2SK389's and 2SJ109's a lot, and they work
really well. MCM sells them.

25th May 2003, 11:37 PM	#1
jwb diyAudio Member Join Date: Mar 2002 Location: San Francisco, USA	Dual FETs for differential pair I am fairly tired of matching IRF9610s! Has anyone here tried using dual FETs for this front-end? Fairchild and Zetex both have promising-sounding parts (e.g. NDS9948, ZXMD63). These devices are obviously highly temperature coupled and produced from the same wafer, so they should be matched fairly well. But, do they sound good?

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26th May 2003, 01:31 AM	#2
Tomo diyAudio Member Join Date: Jun 2002	Hey, Aren't they too small? T

26th May 2003, 01:35 AM	#3
jwb diyAudio Member Join Date: Mar 2002 Location: San Francisco, USA	I'm only trying to dissipate about 300mW.

29th May 2003, 12:24 PM	#4
Nicwix diyAudio Member Join Date: Dec 2001 Location: Sydney, Australia	See NP's reply to: ...what about using a dual MOSFET, rather than worrying about matching discrete pieces Regards Nic

29th May 2003, 07:39 PM	#5
Nelson Pass The one and only Join Date: Mar 2001	We use 2SK389's and 2SJ109's a lot, and they work really well. MCM sells them.

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