JFET Identification

partialresponse · 3rd February 2012, 05:54 AM

I'm trying to repair a C-J preamp damaged by ESD. I cannot identify one of the damaged JFETs marked "CAL JF 1182B" ("CAL" I believe is Calogic.) The device is paired with a CAL J177 which is a Calogic P-channel FET - so the device in question is the complementary N-channel device. But I cannot find any reference to this device online, although the J177 is readily available.

I'd appreciate any help.

Thanks
Kofi

EUVL · 3rd February 2012, 06:21 AM

The closest complementary to J177 is J113, also available from Calogic, among others.

Patrick

partialresponse · 4th February 2012, 06:45 AM

Yes, the characteristics of the J113 seem close to what the circuit was designed for. I will give these a try. But if anyone knows exactly what device the markings correspond to I'd like to know.

Thanks very much.

-Kofi

osscar · 4th February 2012, 07:21 AM

Hi,
Do not forget that different manufacturers have different pin-out for j113!

regards

o.

3rd February 2012, 05:54 AM	#1
partialresponse diyAudio Member Join Date: May 2005 Location: Santa Clara, CA USA	JFET Identification I'm trying to repair a C-J preamp damaged by ESD. I cannot identify one of the damaged JFETs marked "CAL JF 1182B" ("CAL" I believe is Calogic.) The device is paired with a CAL J177 which is a Calogic P-channel FET - so the device in question is the complementary N-channel device. But I cannot find any reference to this device online, although the J177 is readily available. I'd appreciate any help. Thanks Kofi

3rd February 2012, 06:21 AM	#2
EUVL diyAudio Member Join Date: Oct 2003	The closest complementary to J177 is J113, also available from Calogic, among others. Patrick __________________ xen-audio.com

4th February 2012, 07:21 AM	#4
osscar diyAudio Member Join Date: May 2009 Location: Riga, LV	Hi, Do not forget that different manufacturers have different pin-out for j113! regards o. __________________ Leach amp LM 3875 F5 LM1875 Le Monstre Leach amp2 OPA549 OBH8SE

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4th February 2012, 06:45 AM	#3
partialresponse diyAudio Member Join Date: May 2005 Location: Santa Clara, CA USA	Yes, the characteristics of the J113 seem close to what the circuit was designed for. I will give these a try. But if anyone knows exactly what device the markings correspond to I'd like to know. Thanks very much. -Kofi

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