Mr Gromer LNA-1 opamp - 2SC2239BL equivalent

robmil · 5th December 2011, 10:04 AM

Hi Chaps

My stumbling block is low noise transistors. I

robmil · 5th December 2011, 10:11 AM

great...pressed send while the diyaudio site was doing some work.

basically, I'd like to drop in the Sam Gromer SG LNA-1 into my dynavector P75 stage to see what if any improvements I might get. I'm using a Denon 304 (0.18mV) and with the P75 using the LT1115 the noise levels are OK.

Problem is that the SG opamp uses the 2SC3329BL which is now discontinued.

What to do? Is there any other ultra low noise design out there that DOESN'T use discontinued parts. The JE990 uses the LM394. I need something that is OK with low output moving coil cartridges, down to 0.18mV.

thanks guys

Terry Demol · 5th December 2011, 10:30 AM

Quote:

Originally Posted by robmil

great...pressed send while the diyaudio site was doing some work.

basically, I'd like to drop in the Sam Gromer SG LNA-1 into my dynavector P75 stage to see what if any improvements I might get. I'm using a Denon 304 (0.18mV) and with the P75 using the LT1115 the noise levels are OK.

Problem is that the SG opamp uses the 2SC3329BL which is now discontinued.

What to do? Is there any other ultra low noise design out there that DOESN'T use discontinued parts. The JE990 uses the LM394. I need something that is OK with low output moving coil cartridges, down to 0.18mV.

thanks guys

Do some searching around here and through data sheets

2SC2545 / 46 / 47
2SA1083 / 84 / 85

Haven't measured them but data sheet shows similar specs.

cheers

T

dchisholm · 12th December 2011, 08:52 AM

Quote:

Originally Posted by Terry Demol

2SC2545 / 46 / 47
2SA1083 / 84 / 85

The datasheet on Renesas' website is marked "Not Recommended for New Design", so make your once-for-all-time purchases soon . . .

Dale

Samuel Groner · 13th December 2011, 07:10 AM

Quote:

The JE990 uses the LM394.

I've given you a perfect replacement here: Samuel Gromer low noise opamp

Also a lot of other low noise parts are given in this thread.

Samuel

homemodder · 14th December 2011, 03:51 PM

Try 2sa1207 or 2sa1208, hfe might be slightly lower but noise figures are very close to the hitachi parts, very low Rbb.

5th December 2011, 10:04 AM	#1
robmil diyAudio Member Join Date: Jun 2004 Location: London	Mr Gromer LNA-1 opamp - 2SC2239BL equivalent Hi Chaps My stumbling block is low noise transistors. I

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5th December 2011, 10:11 AM	#2
robmil diyAudio Member Join Date: Jun 2004 Location: London	great...pressed send while the diyaudio site was doing some work. basically, I'd like to drop in the Sam Gromer SG LNA-1 into my dynavector P75 stage to see what if any improvements I might get. I'm using a Denon 304 (0.18mV) and with the P75 using the LT1115 the noise levels are OK. Problem is that the SG opamp uses the 2SC3329BL which is now discontinued. What to do? Is there any other ultra low noise design out there that DOESN'T use discontinued parts. The JE990 uses the LM394. I need something that is OK with low output moving coil cartridges, down to 0.18mV. thanks guys

14th December 2011, 03:51 PM	#6
homemodder diyAudio Member Join Date: May 2006	Try 2sa1207 or 2sa1208, hfe might be slightly lower but noise figures are very close to the hitachi parts, very low Rbb.

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