If any if these have been pressed on vinyl in the 80s or later, then yes, very likely some NE5532 has been involved at some point.
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Serious Question: How can Op Amp rolling improve the sound of an already well measuring device? Are that many confused? (Master Thread)
- Thread starter antcollinet
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I edited my post. Who'd want repressings of those?!? The originals are more or less superb.
You might find what you are looking for, or wonder about in the link below? Please note I am not an electronics engineer so please do not ask me in detail what they are talking about.
Reasons for implementing op-amps which are not unity-gain stable
The datasheet for the OP37 boasts that the device is a low-noise, high-speed, precision op-amp. However, one reason why one may choose to not use the OP37 is that it is not unity gain stable. That ...
electronics.stackexchange.com
Because the original pressings aren't numerous enough to meet demand, making repressings viable? Just a guess, but this is very commonplace for vinyl releases, often enough even for obscure electrotechno releases of the 90s and 2000s.
audio_tony
Major Contributor
The NE5534 is one of many opamps that is not unity gain stable, and requires external compensation when used with gains below x3.
There are special pins for compensation. The NE5532 is internally compensated and as such does not require external compensation and hence stable at unity gain.
From the Linear Circuit Design Handbook by Analog Devices, chapter 1.
OP
- Thread Starter
- #167
Actually no. Everything that can be heard can be measured.
The reverse is not true - not all differences that can be measured (or specified) can be heard. Things have to go seriously south before op amp differences (at least amongst those types intended for audio applications) are going to result in any audible differences. Pretty much only when an op amp turns out to be incompatible with the circuit it is put into and just doesn't work properly.
Bear in mind that in many applications, and particularly in line level applications such as used in power amps or DACs, performance of a circuit incorporating an op-amp is dominated by the circuit around the OA more so than the specific characteristics of the device.
Ah, I see. Looks like I was misunderstanding there. Basic implementation practice and requirements is not something I would personally call "unstable". Of course you may still assume a "better layman" level of understanding here on my part, so perhaps I took the "unstable" part too literally.
So I take it, competent implementation assumed, there still are no "unstable" opamps. Unless you really don't know what you're doing.
OP
- Thread Starter
- #169
Plus - any CD releases - even if not re-mastered will be going through some sort of studio gear.
That dosnt stop people from using them for audio.
JSmith
Master Contributor
That's ridiculous... poor form @AIYIMA. As poor as @Fosi Audio claiming one needs specific opamps for particular genres of music.Holy shit, this is what Aiyima themselves have to say about what it sounds like with different op amps in their A04 & A07!
It disappointing actually, as both are good companies that have made some excellent products and have even engaged directly with customers through forums etc. They really don't need to go down the snake oil path... a slippery slope.
It's a little amusing actually that some products used to often have a sticker warning the user that if they opened the device it would void warranty (it doesn't)... but now we have companies actively encouraging people to open their devices and start swapping opamps.
JSmith
Dimitri
Senior Member
Hey...whatever moves the product and pays the bills...
Purist's dunt uze no opamps or listen to recordins anyway
Its the circuit (feedback) that causes instability. Different OAs are internally compensated differently depending on the BW and slew rate desired. So swapping OAs, especially in low gain circuits can cause ringing or instability.
You can sell more devices that way when the device fails.
Who have we seen that knows what they are doing or have instrumentation to check their work? LoL.
Dimitri
Senior Member
and a few unnatributed quotes :
"...certainly learned why many audiophiles build massive op-amp collections. They’re a great way to tweak one’s system and come in all variety of sonic flavours."
"...Now we just need more audio manufacturers releasing portable products with swappable op-amps, so the next generation of audiophiles can discover what they’ve been missing..."
gospel for some, "sunday funnies" for others !
"...certainly learned why many audiophiles build massive op-amp collections. They’re a great way to tweak one’s system and come in all variety of sonic flavours."
"...Now we just need more audio manufacturers releasing portable products with swappable op-amps, so the next generation of audiophiles can discover what they’ve been missing..."
gospel for some, "sunday funnies" for others !
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Absolutely! That's what Victrolas are for!Purist's dunt uze no opamps or listen to recordins anyway
I mean, if you're gonna listen to Caruso, you want to hear him as the artist and recording engineer intended!
source: https://jeffsplace.positive-feedbac...me-1-1904-1920-the-nimbus-records-prima-voce/ (and not, apparently, actually a Caruso acoustic recording session, in full disclosure)
DreaminquE
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I guess I'm a little late I didn't expect the topic to be this big. I thought I could reach a conclusion with a short answer. Thank you to everyone who tried to help. Since such a topic is important to everyone. I think it should be on the homepage as the most searched topics. Just a suggestion.
I didn't expect the topic to be this big. I thought I could reach a conclusion with a short answer. Thank you to everyone who tried to help. Since such a topic is important to everyone. I think it should be on the homepage as the most searched topics. Just a suggestion.OP amp rolling is not front page material. It is subjective guess work with no science involved.I guess I'm a little late
Dimitri
Senior Member
What you said sounds bad. I'll try reading it with different op-amp
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