| KLe |
Hi All
Just wondering if you could advise me on the best opa604a opamp replacement?
thanks
:) |
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| KLe |
I believe that the AD-825 is a good replacement ... anybody know any others ...
:) |
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| jcx |
as always ...it depends
if the cirucit takes advantage of the unusually high supply V capability of the 604 you may have difficulty finding any suitable replacement |
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| KLe |
Hi jcx
circuit voltage is +/-15VDC
:) |
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| myhrrhleine |
| quote: | Originally posted by KLe
Hi All
Just wondering if you could advise me on the best opa604a opamp replacement?
thanks
:) |
What is your criteria for 'best'
Low distortion?
low noise?
overall sound?
etc. |
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| KLe |
| quote: | Originally posted by myhrrhleine
What is your criteria for 'best'
Low distortion?
low noise?
overall sound?
etc. |
Hi myhrrhleine
Hi PSRR, low noise and overall sound, most probably, although I am really interested in what people consider to be their best alternative and why they think so.
I have looked at the AD825 and the Burson Audio Opamp, which also seems to be an excellent drop in replacements.
The PS requirement is +/- 15VDC. I am sure that there are many other alternates out there, so, I would love to hear your thoughts.
:) |
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| PMA |
| OPA627, OPA827, AD825, OPA134. To me, all of them sound better than the OPA604. |
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| KLe |
| quote: | | OPA627, OPA827, AD825, OPA134 |
Hi Pavel
Which one is your favourite or do you have another that you prefer?
thanks
:) |
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| myhrrhleine |
| quote: | Originally posted by PMA
OPA627, OPA827, AD825, OPA134. To me, all of them sound better than the OPA604. |
I concur.
I think i'd go with the '827 if I could manage the package, otherwise the '134 would be my choice.
The '827 could also be a hf oscillation problem tho. The '134 would be better in that regard imo. |
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| YFW |
| OPA627,Cello Pallette Pre use it. |
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| KLe |
| quote: | Originally posted by myhrrhleine
I concur.
I think i'd go with the '827 if I could manage the package, otherwise the '134 would be my choice.
The '827 could also be a hf oscillation problem tho. The '134 would be better in that regard imo. |
Hi myhrrhleine
Interesting choices ... why would you choose the OPA827 and OPA134 over the OPA627 or AD825?
thanks
:) |
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| KLe |
Hi all
Is the LM4562 a dropin replacement for the opa604a. Here's a quote from Bob Pearse
| quote: | | This precision amplifier, the LME49720, (also known as an LM4562) not only tests good, but it sounds good. The distortion is not only down somewhere below 0.15 ppm at 25 Hz, but it keeps improving at frequencies up to 1 kHz. It was designed as a precision audio amplifier, but is well suited for many other precision opamp functions, with the best, lowest distortion in the industry. The thermals found in most other bipolar transistor op-amps have been banished by excellent layout. Distortion as low as -159 dB has been observed as an inverter, even driving a 2 kilohm load. |
thanks
:) |
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| chicago_mike |
Hey peeps:)
I have swr amp with quite a few od the TL072's. I put a couple of the 2604's in as replacements...
But as a drop in replacement, what would you guys recommend:
Quiet operation is most important, then audio quality, but I think most newer stuff is nicer then the TL072???
And is ebay a safe place to get them or who do you guys order from?
Thanks!:)
Mike |
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| bear |
In the mean time it was trivial to hear the difference between the two similar and recent National "ultra-super-low" distortion opamps for me. I think one of them is the one mentioned by Pease, and both have virtually identical specs (would love to see the actual, real schematic, eh? :rolleyes: )
I was not happy at all to hear any difference between them, and worse to not like one of them in a big way at all...
...and no I did not get to do a meaningful measurement on either... but one would think that you couldn't do squat to hear any difference between those two, right??
So, I'm not so fast to suggest opamps myself... seems like a whole lot depends on where they are and what they are trying to do as far as the sound that comes out...
_-_-bear |
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| KLe |
Hi Bear, which ones are you talking about?
thanks
:) |
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| lumanauw |
| Why LM6172 sounds quite different than LM4562? LM6172 sounds too "thin". Both have great spec. Which one should be the "right sound"? |
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| bear |
| quote: | Originally posted by KLe
Hi Bear, which ones are you talking about?
thanks
:) |
Sorry, don't have the numbers in front of me.
I'd have to make an effort to look in the right places and round them up... both had the same 0.000000000000000000x% (exagerrating) THD specs from National...
The idea remains the same, regardless. As lumanauw said, which one is "right" and why the heck should they have any audible sonic difference in the first place??
Just pick the one(s) that sound best, imho.
Forget about what anyone says about them, unless they sound good, then what good is it?
_-_-bear |
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