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Old 18th March 2004, 01:49 AM   #1
afxdave is offline afxdave  United States
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Default 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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Old 18th March 2004, 07:41 AM   #2
Zombie is offline Zombie  Sweden
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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
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Old 18th March 2004, 06:16 PM   #3
afxdave is offline afxdave  United States
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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.
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Old 18th March 2004, 07:20 PM   #4
Zombie is offline Zombie  Sweden
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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
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Old 18th March 2004, 07:43 PM   #5
sam9 is offline sam9  United States
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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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