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#1
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2520 Schematics?
Does anyone know where I can get 2520 schematics? I'm interested in
any revision anyone might have, right back to and including the Melcor 1731. I'm trying to understand the evolution of the part, and thereby gain some insight into the choices the designers made. Thanks. |
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#2
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2520 Schematics?
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#3
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2520 Schematics?
I'm only looking for schematics of the op-amp itself. I'd really like to
see original factory documents that detail any ECOs they implemented over the years. "Mike Rivers" wrote in message news:znr1081103165k@trad... In article writes: Does anyone know where I can get 2520 schematics? Oh, I probalby have two or three hundred around here. Maybe we can take up a collection. Or are you looking for one schematic of a particular unit with 2520 in its name that should be familiar to everyone? -- I'm really Mike Rivers ) However, until the spam goes away or Hell freezes over, lots of IP addresses are blocked from this system. If you e-mail me and it bounces, use your secret decoder ring and reach me he double-m-eleven-double-zero at yahoo |
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#4
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2520 Schematics?
SeventhCircle wrote:
I'm only looking for schematics of the op-amp itself. I'd really like to see original factory documents that detail any ECOs they implemented over the years. As I recall there really isn't much inside those things. There's really not much to ECO. I might expect some changes here and there as parts become available and need to be subsituted with equivalents, but there isn't a lot to change. If you have a bad one (and everybody seems to), pop one open and look inside. as I recall it's the usual three-transistor configuration. I forget if they have a push-pull drive stage or a constant current source for the input stage, but there's not a whole lot in there. You might also try Modular Audio Products, or the power supply guys who currently run the company. They made a 2520 equivalent too, and there is one person left who still knows all the MAP stuff and has docs. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
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#5
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2520 Schematics?
I've got one schematic that seems to have been the result of examining
several different units. It includes notes regarding the variations but no information regarding the dates or progression of the changes, or the reasoning behind them. I don't know who made this document. I'll e-mail it to you if you want it. ulysses In article , SeventhCircle wrote: Does anyone know where I can get 2520 schematics? I'm interested in any revision anyone might have, right back to and including the Melcor 1731. I'm trying to understand the evolution of the part, and thereby gain some insight into the choices the designers made. Thanks. |
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#6
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2520 Schematics?
Justin Ulysses Morse wrote:
I've got one schematic that seems to have been the result of examining several different units. It includes notes regarding the variations but no information regarding the dates or progression of the changes, or the reasoning behind them. I don't know who made this document. I'll e-mail it to you if you want it. I wonder if someone looking for the 2520 stuff wouldn't be better off getting the "open source" 990 info? -- ha |
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#7
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Oh, 600 posts in 24 hours. That must mean ...........
Roger and friends have forgotten this is RAP, not "**** You, I'll post
anything I want to." Well if he/they want to use the bandwidth to BS about politics and religion, then I guess it's OK for me to BS about their hijacking the newsgroup. I could always just paste in long meaningless blocks of text. Maybe post a binary or two just to show I have the same disregard for the others here. Regards, Ty (All qualities of life are demeaned when you have no respect for yourself) Ford For equipment reviews and other audio delights, try http://www.jagunet.com/~tford |
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#8
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2520 Schematics?
hank alrich wrote:
Justin Ulysses Morse wrote: I've got one schematic that seems to have been the result of examining several different units. It includes notes regarding the variations but no information regarding the dates or progression of the changes, or the reasoning behind them. I don't know who made this document. I'll e-mail it to you if you want it. I wonder if someone looking for the 2520 stuff wouldn't be better off getting the "open source" 990 info? The 990 is different. I think it's better personally, but it's different. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
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#9
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Oh, 600 posts in 24 hours. That must mean ...........
Ty Ford wrote:
Roger and friends have forgotten this is RAP, not "**** You, I'll post anything I want to." Fit to be Ty'd, eh? Perhaps rightly so. Gimme that ol' time religion Gimme that ol' time religion Gimme that ol' time religion I'll go and start a war I'm uh gunna go oust the bad guys I'm uh gunna go oust the bad guys I'm uh gunna go oust the bad guys 'Cause God done tol' me so Git their weppuns of mass destruckshun Git their weppuns of mass destruckshun Git their weppuns of mass destruckshun Add 'em to my stash I'm uh gunna kil their wimmen 'n' childern I'm uh gunna kil their wimmen 'n' childern I'm uh gunna kil their wimmen 'n' childern Jus' so they'll know I'm tuff Can't find those doggone weppons Can't find those doggone weppons Can't find those doggone weppons But I nose they got 'em hid Must be in here somewhere Must be in here somewhere They must have 'em in here somewhere Sombody said they did Man, this is gunna cost a fortune Man, this is gunna cost a fortune Man, this is gunna cost a fortune An' it's takin' way too long I done said this war wuz over I done said this war wuz over I done said this war wuz over But another good man done gone Now th' gen'rul's gunna need more troops Hey th' gen'ril's gunna need more troops Yeh th' gen'ral's gunna need more troops 'Cause he ain't got enuff It ain't wurkin' out like I planned it It ain't wurkin' out like I planned it It ain't wurkin' out like I planned it Those bad guys know their stuff They just don't wanna listen They don't give a **** about Jesus They don't wanna show no mercy Those bad guys sure are mean I'll keep sluggin' for Halliburton Gotta keep my buddies aquirtin' Kepp mah 'telligents alurtin' Them dollars rollin' 'round This is all 'bout freedom This is all 'bout freedom This is all 'bout freedom Gunna show 'em what it means -- ha |
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#10
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Oh, 600 posts in 24 hours. That must mean ...........
Hank's parody is a perfect example of how pathetic this newsgroup has
become. Hank - and anyone else - I could care less about your political opinions. I do value the opportunity to read your AUDIO opinions. Ty - you're absolutely right. (hank alrich) wrote in message ... Ty Ford wrote: Roger and friends have forgotten this is RAP, not "**** You, I'll post anything I want to." Fit to be Ty'd, eh? Perhaps rightly so. Gimme that ol' time religion Gimme that ol' time religion Gimme that ol' time religion I'll go and start a war |
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#11
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Oh, 600 posts in 24 hours. That must mean ...........
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#13
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Oh, 600 posts in 24 hours. That must mean ...........
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#14
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2520 Schematics?
hank alrich wrote:
Justin Ulysses Morse wrote: I've got one schematic that seems to have been the result of examining several different units. It includes notes regarding the variations but no information regarding the dates or progression of the changes, or the reasoning behind them. I don't know who made this document. I'll e-mail it to you if you want it. I wonder if someone looking for the 2520 stuff wouldn't be better off getting the "open source" 990 info? The OP is the manufacturer of kits for vintage-styled preamps (good ones, at that) and sounds like he's interested in learning about the history and evolution of the classic circuit so he can understand why they made the changes they did, presumably to determine which ones gave performance enhancements and which were simply to improve cost, efficiency, or parts availability. Tim, why don't you come back and tell us what you're up to? Are you working on your own discrete op-amp module? ulysses |
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#15
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Oh, 600 posts in 24 hours. That must mean ...........
NoSpam Jones wrote:
Hank's parody is a perfect example of how pathetic this newsgroup has become. Hank - and anyone else - I could care less about your political opinions. I was aiming to have FUN, jiving with Ty, and have until that parody avoided the current shreds about the current state of the war in Eyerak. Everything that can be said has been said, many times over, the scenario is unfloding just like those who remember 'Nam said it would, and I accept that I can change nothing by arguing with war mongers who mistake themselves for liberators. I do value the opportunity to read your AUDIO opinions. You idiot! I know nothing about audio, and if you could hear my current project you'd realize that. g Ty - you're absolutely right. Well, I don't think so; I think Ty's neither right nor left, but somewhere in the middle. -- ha |
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#16
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Oh, 600 posts in 24 hours. That must mean ...........
In Article ,
(hank alrich) wrote: Ty Ford wrote: Roger and friends have forgotten this is RAP, not "**** You, I'll post anything I want to." Fit to be Ty'd, eh? Perhaps rightly so. Damnit Hank, you have to post the chords on top so we can all play along.. G Gimme that ol' time religion C Gimme that ol' time religion G Gimme that ol' time religion D G I'll go and start a war I'm uh gunna go oust the bad guys I'm uh gunna go oust the bad guys I'm uh gunna go oust the bad guys 'Cause God done tol' me so Git their weppuns of mass destruckshun Git their weppuns of mass destruckshun Git their weppuns of mass destruckshun Add 'em to my stash I'm uh gunna kil their wimmen 'n' childern I'm uh gunna kil their wimmen 'n' childern I'm uh gunna kil their wimmen 'n' childern Jus' so they'll know I'm tuff Can't find those doggone weppons Can't find those doggone weppons Can't find those doggone weppons But I nose they got 'em hid Must be in here somewhere Must be in here somewhere They must have 'em in here somewhere Sombody said they did Man, this is gunna cost a fortune Man, this is gunna cost a fortune Man, this is gunna cost a fortune An' it's takin' way too long I done said this war wuz over I done said this war wuz over I done said this war wuz over But another good man done gone Now th' gen'rul's gunna need more troops Hey th' gen'ril's gunna need more troops Yeh th' gen'ral's gunna need more troops 'Cause he ain't got enuff It ain't wurkin' out like I planned it It ain't wurkin' out like I planned it It ain't wurkin' out like I planned it Those bad guys know their stuff They just don't wanna listen They don't give a **** about Jesus They don't wanna show no mercy Those bad guys sure are mean I'll keep sluggin' for Halliburton Gotta keep my buddies aquirtin' Kepp mah 'telligents alurtin' Them dollars rollin' 'round This is all 'bout freedom This is all 'bout freedom This is all 'bout freedom Gunna show 'em what it means -- ha For equipment reviews and other audio delights, try http://www.jagunet.com/~tford |
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#17
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Oh, 600 posts in 24 hours. That must mean ...........
In Article ,
(hank alrich) wrote: NoSpam Jones wrote: Hank's parody is a perfect example of how pathetic this newsgroup has become. Hank - and anyone else - I could care less about your political opinions. I was aiming to have FUN, jiving with Ty, and have until that parody avoided the current shreds about the current state of the war in Eyerak. Everything that can be said has been said, many times over, the scenario is unfloding just like those who remember 'Nam said it would, and I accept that I can change nothing by arguing with war mongers who mistake themselves for liberators. I do value the opportunity to read your AUDIO opinions. You idiot! I know nothing about audio, and if you could hear my current project you'd realize that. g Ty - you're absolutely right. Well, I don't think so; I think Ty's neither right nor left, but somewhere in the middle. -- ha But not balanced. More of a cascade or cascode thing. Ty Ford For equipment reviews and other audio delights, try http://www.jagunet.com/~tford |
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#18
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Oh, 600 posts in 24 hours. That must mean ...........
"hank alrich" wrote in message
.. . Everything that can be said has been said, many times over, the scenario is unfloding just like those who remember 'Nam said it would, and I accept that I can change nothing by arguing with war mongers who mistake themselves for liberators. The problem with comparing every conflict we enter with Vietnam is that every conflict we enter then has the potential of turning into another Vietnam; the more that drum is beaten, the more it's likely to happen. Support the war/Don't support the war, Republican/Democrat, it doesn't matter - there's something to be said about a self-fulfilling prophecy; and that something is that it's not a good thing for our country or the troops that are over there getting killed defending it ( please note that that's their mission, regardless of their political persuasion, they took an oath to follow orders). -- Neil Henderson Progressive Rock http://www.saqqararecords.com |
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#19
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Oh, 600 posts in 24 hours. That must mean ...........
Hi Hank!
I can't believe you called me names! Sniff, sniff...You've hurt my feelings...I thought liberals were concerned about not hurting people's feelings... (hank alrich) wrote in message ... NoSpam Jones wrote: Hank's parody is a perfect example of how pathetic this newsgroup has become. Hank - and anyone else - I could care less about your political opinions. I was aiming to have FUN, jiving with Ty, and have until that parody avoided the current shreds about the current state of the war in Eyerak. Everything that can be said has been said, many times over, the scenario is unfloding just like those who remember 'Nam said it would, and I accept that I can change nothing by arguing with war mongers who mistake themselves for liberators. I do value the opportunity to read your AUDIO opinions. You idiot! I know nothing about audio, and if you could hear my current project you'd realize that. g Ty - you're absolutely right. Well, I don't think so; I think Ty's neither right nor left, but somewhere in the middle. |
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#20
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Oh, 600 posts in 24 hours. That must mean ...........
NoSpam Jones wrote:
I can't believe you called me names! Sniff, sniff...You've hurt my feelings...I thought liberals were concerned about not hurting people's feelings... I'm not a liberal; maybe that's the problem. That damn Ty Ford posted off topic into the middle of a perfectly good and potentially useful thread about API 2520 opamp schematics. Now look what's happened. This place is just goin' t' the schoeps. -- ha |
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#21
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Oh, 600 posts in 24 hours. That must mean ...........
Ty Ford wrote:
Damnit Hank, you have to post the chords on top so we can all play along.. Since yer alreddy typin' 'em in there, what makes you think to trick me into havin' t' type 'em, too? Capo up, good buddy. You know, I can think of a few times buildin' fence when I'd've been delighted to do 600 posts in 24 hours and just get it the hell over with. -- ha |
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#22
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Oh, 600 posts in 24 hours. That must mean ...........
In Article ,
wrote: "hank alrich" wrote in message . .. Everything that can be said has been said, many times over, the scenario is unfloding just like those who remember 'Nam said it would, and I accept that I can change nothing by arguing with war mongers who mistake themselves for liberators. The problem with comparing every conflict we enter with Vietnam is that every conflict we enter then has the potential of turning into another Vietnam; the more that drum is beaten, the more it's likely to happen. Support the war/Don't support the war, Republican/Democrat, it doesn't matter - there's something to be said about a self-fulfilling prophecy; and that something is that it's not a good thing for our country or the troops that are over there getting killed defending it ( please note that that's their mission, regardless of their political persuasion, they took an oath to follow orders). -- Neil Henderson Progressive Rock http://www.saqqararecords.com Careful Neil, you may be reassigned to Roger's group. Ty :0 For equipment reviews and other audio delights, try http://www.jagunet.com/~tford |
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#23
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Oh, 600 posts in 24 hours. That must mean ...........
Audio is boring?
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#24
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Oh, 600 posts in 24 hours. That must mean ...........
In rec.audio.pro, (Ty Ford ) wrote:
In Article , (hank alrich) wrote: Ty Ford wrote: Roger and friends have forgotten this is RAP, not "**** You, I'll post anything I want to." Fit to be Ty'd, eh? Perhaps rightly so. Damnit Hank, you have to post the chords on top so we can all play along.. G Gimme that ol' time religion C Gimme that ol' time religion G Gimme that ol' time religion D G I'll go and start a war This is great, I'm gonna have to take it to the next jam nite, both the original and the filk versions are getting old, they're so "Second Millenium." Everyone will love it, they're all a bunch of... can I use the L word here, or will the FCC come after me? With apologies to Tom Paxton, and I think he'd understand, "I am changing my name to Haliburton..." -- ha For equipment reviews and other audio delights, try http://www.jagunet.com/~tford ----- http://mindspring.com/~benbradley |
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#25
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2520 Schematics?
Justin Ulysses Morse wrote in message om...
hank alrich wrote: Justin Ulysses Morse wrote: I've got one schematic that seems to have been the result of examining several different units. It includes notes regarding the variations but no information regarding the dates or progression of the changes, or the reasoning behind them. I don't know who made this document. I'll e-mail it to you if you want it. I wonder if someone looking for the 2520 stuff wouldn't be better off getting the "open source" 990 info? The OP is the manufacturer of kits for vintage-styled preamps (good ones, at that) and sounds like he's interested in learning about the history and evolution of the classic circuit so he can understand why they made the changes they did, presumably to determine which ones gave performance enhancements and which were simply to improve cost, efficiency, or parts availability. Tim, why don't you come back and tell us what you're up to? Are you working on your own discrete op-amp module? ulysses Hi guy´s, This schematic ulysses talk about I think I have see in i Recording.org forum post for a time ago, I can not find this post but I have save my answer to this post, and here it is: (Bo Hansén wrote to recording.org) I have see "this" before but I don´t know if this is the first API 2520 after the Melcor 1731. I know that the API 2520 under 1980´s when Datatronix own API not have exact this circuit but a simular design, and what I remember this 2520 begin with a PNP differential pair with a current sourse that draw aprox. 50uA in each transistor, then a other NPN differential pair (no current sourse) that have aprox. 250uA in each transistor that feed the upper and lower "common emitter" PNP/NPN stage with aprox. 5 mA current through the output transistors bias diodes (the upper PNP have a 1:1 phase reverse NPN transistor before the base)and at last a complementary class A/B emitter follower with 5 ohms emitter resistors that have aprox. 15 mA quiescent current. Pretty like this schematic you show here, but with different polarity on the differential pairs and the current sourse on the input pair. This op-amp has a pretty usal circuit design that was very ordinary for this time around 1960/70 for industrial/instrumentation application. The 2520 is not a fast op-amp compare with to day´s op-amps,(TL071/5534 around 15V/uS) it have only a slew rate of 3V/uS with a result of aprox. 30-50 kHz bandwith for full output swing, but the 2520´s strenght was the output current competent, it can easy drive a output transformer with 75 ohms primary, and according my comprehension is that a part of the famous API sound. (the other part is the old 2503 quadfilar output transformer) --Bo |
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#26
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Oh, 600 posts in 24 hours. That must mean ...........
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#27
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Oh, 600 posts in 24 hours. That must mean ...........
haligonab stevieb_at_spamsux._iglou_dot_com wrote:
Hank waxes poetic. Should make a nice addition to the next compilation! Glad you like it; but it's nowhere near as good as "They Can't Get Bin Laden", a guacalypso piece almost as long as "Abdullah Bulbul Amir". (Man, we're need to _step_ on it if we're gonna keep up this sicks hunnerd posts ever twennyfore hours and not disappoint Ty!) -- ha |
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#28
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Oh, 600 posts in 24 hours. That must mean ...........
Think you can work in a verse using "Nutron Bomb", " and, "we can still get
the oil". What is the radiation half-life on one of those firecrackers anyway? Tom "haligonab" stevieb_at_spamsux._iglou_dot_com wrote in message ... On Wed, 07 Apr 2004 14:39:59 GMT, (hank alrich) wrote: Ty Ford wrote: Roger and friends have forgotten this is RAP, not "**** You, I'll post anything I want to." Fit to be Ty'd, eh? Perhaps rightly so. Gimme that ol' time religion Gimme that ol' time religion Gimme that ol' time religion I'll go and start a war I'm uh gunna go oust the bad guys I'm uh gunna go oust the bad guys I'm uh gunna go oust the bad guys 'Cause God done tol' me so Git their weppuns of mass destruckshun Git their weppuns of mass destruckshun Git their weppuns of mass destruckshun Add 'em to my stash I'm uh gunna kil their wimmen 'n' childern I'm uh gunna kil their wimmen 'n' childern I'm uh gunna kil their wimmen 'n' childern Jus' so they'll know I'm tuff Can't find those doggone weppons Can't find those doggone weppons Can't find those doggone weppons But I nose they got 'em hid Must be in here somewhere Must be in here somewhere They must have 'em in here somewhere Sombody said they did Man, this is gunna cost a fortune Man, this is gunna cost a fortune Man, this is gunna cost a fortune An' it's takin' way too long I done said this war wuz over I done said this war wuz over I done said this war wuz over But another good man done gone Now th' gen'rul's gunna need more troops Hey th' gen'ril's gunna need more troops Yeh th' gen'ral's gunna need more troops 'Cause he ain't got enuff It ain't wurkin' out like I planned it It ain't wurkin' out like I planned it It ain't wurkin' out like I planned it Those bad guys know their stuff They just don't wanna listen They don't give a **** about Jesus They don't wanna show no mercy Those bad guys sure are mean I'll keep sluggin' for Halliburton Gotta keep my buddies aquirtin' Kepp mah 'telligents alurtin' Them dollars rollin' 'round This is all 'bout freedom This is all 'bout freedom This is all 'bout freedom Gunna show 'em what it means Hank waxes poetic. Should make a nice addition to the next compilation! |
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#29
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Oh, 600 posts in 24 hours. That must mean ...........
"haligonab" stevieb_at_spamsux._iglou_dot_com wrote in message ... On Wed, 07 Apr 2004 14:39:59 GMT, (hank alrich) wrote: Ty Ford wrote: Roger and friends have forgotten this is RAP, not "**** You, I'll post anything I want to." Fit to be Ty'd, eh? Perhaps rightly so. Gimme that ol' time religion Gimme that ol' time religion Gimme that ol' time religion I'll go and start a war I'm uh gunna go oust the bad guys I'm uh gunna go oust the bad guys I'm uh gunna go oust the bad guys 'Cause God done tol' me so Git their weppuns of mass destruckshun Git their weppuns of mass destruckshun Git their weppuns of mass destruckshun Add 'em to my stash I'm uh gunna kil their wimmen 'n' childern I'm uh gunna kil their wimmen 'n' childern I'm uh gunna kil their wimmen 'n' childern Jus' so they'll know I'm tuff Can't find those doggone weppons Can't find those doggone weppons Can't find those doggone weppons But I nose they got 'em hid Must be in here somewhere Must be in here somewhere They must have 'em in here somewhere Sombody said they did Man, this is gunna cost a fortune Man, this is gunna cost a fortune Man, this is gunna cost a fortune An' it's takin' way too long I done said this war wuz over I done said this war wuz over I done said this war wuz over But another good man done gone Now th' gen'rul's gunna need more troops Hey th' gen'ril's gunna need more troops Yeh th' gen'ral's gunna need more troops 'Cause he ain't got enuff It ain't wurkin' out like I planned it It ain't wurkin' out like I planned it It ain't wurkin' out like I planned it Those bad guys know their stuff They just don't wanna listen They don't give a **** about Jesus They don't wanna show no mercy Those bad guys sure are mean I'll keep sluggin' for Halliburton Gotta keep my buddies aquirtin' Kepp mah 'telligents alurtin' Them dollars rollin' 'round This is all 'bout freedom This is all 'bout freedom This is all 'bout freedom Gunna show 'em what it means Hank waxes poetic. Should make a nice addition to the next compilation! and how is this and diffrent , I see no recording related text. or do you think your off topic is more acceptable than Rogers off topic? George |
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#30
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Oh, 600 posts in 24 hours. That must mean ...........
George wrote:
and how is this and diffrent , I see no recording related text. You missed "Halliburton"; they make nice mic cases. (You are hereby docked six points for taking this **** seriously. Bad George!) -- ha |
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