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?
Long story short; what's a good replacement for the TL074/TL084 OP-AMPs?
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
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
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.
So, yes this is a quad and I'm still hunting for a 14-DIP replacement. Thank you.
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/folders/print/opa4134.html#pricingpackaging
Cheers,
Tom
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/folders/print/opa4134.html#pricingpackaging
Cheers,
Tom
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.
I'm sure there are other possabilities but these just now came to mind.
I've got a JBL 6230 power amp which uses two TL084 quads. Wondering the same thing: any recommendable drop-in replacements? My amp has them mounted in sockets (whoop whoop).
I know there have been changes in op amp technology since 2004. Anybody have a recommendation?
Looks like the AD713 could be a good choice. It's marketed as an upgrade for TL084: http://www.hep.uiuc.edu/cleo/trig3/boards/tile/vme021d_data_sheets/ad713.pdf
I know there have been changes in op amp technology since 2004. Anybody have a recommendation?
Looks like the AD713 could be a good choice. It's marketed as an upgrade for TL084: http://www.hep.uiuc.edu/cleo/trig3/boards/tile/vme021d_data_sheets/ad713.pdf
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Post the amp schematic so we can see what are those TL084 *actually* doing.
Without knowing that , suggesting "improvements" , specially audible ones, is similar to lamb guts or tea leaves adivination.
Without knowing that , suggesting "improvements" , specially audible ones, is similar to lamb guts or tea leaves adivination.
Ah, right. It's on page 31 of the service manual: http://www.jblproservice.com/pdf/Vintage JBL-UREI Electronics/JBL-6230_ 6260manual.pdf
In guitar amps, I believe this function is called a buffer or phase inverter.
In guitar amps, I believe this function is called a buffer or phase inverter.
Yei, I just desoldered a dozen AD713, will have to try to upgrade some basic power amps too 🙂 Got some TL054 too, anyone have any opinion on them. They are more expensive than the most basic TL opamps at least...if that means anything 🙂
There's little wrong with 084 and 074.
An op amp should faithfully reproduce what is on the input to the output (with set gain)
If it is changing it then it is faulty !
An op amp should faithfully reproduce what is on the input to the output (with set gain)
If it is changing it then it is faulty !
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