TL084/TLO74 replacements

afxdave · 18th March 2004, 12:49 AM

Hi, I have a TLO84/TL074 based phono preamp that I've been upgrading. I already switched in 1% metal fiml resistors along with polypropeline caps.

Long story short; what's a good replacement for the TL074/TL084 OP-AMPs?

Zombie · 18th March 2004, 06:41 AM

Are they quads? OPA4134
Is the power supply good?
Bypass V+/V- to ground with 0,1uF film caps close to the pins...

Others might recommend others types...

good luck
tom

afxdave · 18th March 2004, 05:16 PM

The idea is to simply remove the IC and drop in another one. I don't have space on the board to squeezy anything else in there. Unfortunately the OPA4134 isn't available in 14-DIP any more. I experimented by using 2X OPA4132 and the results were fair. The sound was very transparent, but didn't have as much bottom end as the TL084 did.

So, yes this is a quad and I'm still hunting for a 14-DIP replacement. Thank you.

Zombie · 18th March 2004, 06:20 PM

Hello
Try this page, it's a supplier in Sweden:
http://www.elfa.se/elfa/produkter/en/2017378.htm
Isn't it the SO14 your looking for?

Look here: http://focus.ti.com/docs/prod/folder...icingpackaging

Cheers,
Tom

sam9 · 18th March 2004, 06:43 PM

OPA4227 and OPA4228 come in DIP-14 per the TI datasheet. The "7" is optimised for unity gain while the "8" for gain>5. Both clain very low noise and distortion. They have limits on current seen at the input but I doubt that would be a problen when the source is a phono cartridge.

I'm sure there are other possabilities but these just now came to mind.

18th March 2004, 12:49 AM	#1
afxdave diyAudio Member Join Date: Jan 2004 Location: West Hartford, CT	TL084/TLO74 replacements Hi, I have a TLO84/TL074 based phono preamp that I've been upgrading. I already switched in 1% metal fiml resistors along with polypropeline caps. Long story short; what's a good replacement for the TL074/TL084 OP-AMPs?

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18th March 2004, 06:41 AM	#2
Zombie diyAudio Member Join Date: Feb 2003 Location: At home	Are they quads? OPA4134 Is the power supply good? Bypass V+/V- to ground with 0,1uF film caps close to the pins... Others might recommend others types... good luck tom

18th March 2004, 05:16 PM	#3
afxdave diyAudio Member Join Date: Jan 2004 Location: West Hartford, CT	The idea is to simply remove the IC and drop in another one. I don't have space on the board to squeezy anything else in there. Unfortunately the OPA4134 isn't available in 14-DIP any more. I experimented by using 2X OPA4132 and the results were fair. The sound was very transparent, but didn't have as much bottom end as the TL084 did. So, yes this is a quad and I'm still hunting for a 14-DIP replacement. Thank you.

18th March 2004, 06:20 PM	#4
Zombie diyAudio Member Join Date: Feb 2003 Location: At home	Hello Try this page, it's a supplier in Sweden: http://www.elfa.se/elfa/produkter/en/2017378.htm Isn't it the SO14 your looking for? Look here: http://focus.ti.com/docs/prod/folder...icingpackaging Cheers, Tom

18th March 2004, 06:43 PM	#5
sam9 diyAudio Member Join Date: Jun 2002 Location: Left Coast	OPA4227 and OPA4228 come in DIP-14 per the TI datasheet. The "7" is optimised for unity gain while the "8" for gain>5. Both clain very low noise and distortion. They have limits on current seen at the input but I doubt that would be a problen when the source is a phono cartridge. I'm sure there are other possabilities but these just now came to mind.

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