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For those who own MANLEY equipment there is a possibility to obtain the schematic for the device you own. All you have to do, is send a mail to MANLEY, and specify the model of your device, serial number, and the dealer from where you bought it, and request the schematics. You can find information about the procedure at MANLEY customer tech support. They will send you the schematics in PDF format.
I would be curious to see how they done the MASSIVE-PASSIVE. Anyone here has the MASSIVE-PASSIVE schematic ? Does anyone saw the schematic of the passive eq [EQ-500] designed by ART DAVIS and built by ALTEC LANSING and UNIVERSAL RECORDING ?
By the way, Jakob, I saw on your page the Gyratec XIV and it looks very similar to the MASSIVE. That is the company you are talking about?



anonymous Mon, 10/28/2002 - 13:56

Hi Chris,


I have'n´t their schematic yet, but I know a producer that owns one - so the next time he's in the studio, I'll try calling for a manual..

I had his open, and to my disappointment I found opamps in the input. They also say this in the mamual, if you read closely. But all this hype about esoteris inductors? In the Hi/lo-pass at least, they use standard inductors from - Farnell :)

I'm still working on the shelving stuff for this.

Jakob E

anonymous Mon, 10/28/2002 - 21:47

I'm interrested in the Massive Passive schematics, too. This is very funny, the Farnell inductor thing.. I've read the manual a dozen times (I find it nice reading) and there they really point out how very very important it is to design the inductors to make this and that.. And then they use the Farnell models. I quess it's about money, too. These inductors are cheap - and the DC resistance doesn't matter in shelving section as much.

I've been thinking about making a 18db hi/lo pass filters from capacitors and inductors only and add it to the parametric EQ I build one day. Just to remove some electronics..


anonymous Wed, 11/13/2002 - 08:51

I've got a couple things from a friend who will remain nameless. Since the place I work are Manley dealers and the stuff they make is absolutely awesome and Evana is paranoid (and maybe rightly so) I won't post them. I would, however, email them to someone (or even two) who would swear on their mother's grave not to post them but compare them to the Gates Sta-level or the Universal Audio Vari-Mu's. This with the whole intent on making a new DIY project out of it. Cloning the Manley would be hard anyway since the output tranny is pretty wacky.

anonymous Wed, 11/13/2002 - 11:49

Hi Kent

I'd luuurrve to see some of those.

David Manley used to live here in Johannesburg, owned a post production studio, & I have a pair of Leak TL12+ chassis that he modded & burnt out a lot of components on. They have an engraved plate on them with his name & address etc. Eve-anna is his daughter I believe.

Anyone for Trivial Pursuit?..


anonymous Wed, 11/13/2002 - 12:06


Check your email. For the rest of you: ask Jakob cuz sending these files is taking way too long... uhh, what files? Did I say files. Must have been my grocery list or something.

Pete, I heard Evana was his ex. Something like he flew the coop and left her with the biz although I would think there was an age difference. I could just be talking out of my ass since I'm just repeating non-reliable information.

kent (I hate 56k)

anonymous Fri, 11/15/2002 - 09:57

That Sowter looks like the ticket! It's listed at 20% NFB and I think I read somewhere that the Manley runs 19%. That's damn close and probably can be doctored a little. It's cheap too! It looks to me like the Gates is the Grandfather of all these and could be updated with a similar side chain section to the Manley without the odd transformer if necessary. I do like the simplicity of the Manley side chain.

Too much cool stuff and not enough time :(


vanimal Fri, 11/15/2002 - 10:13

Farnell inductors? We don't buy Farnell anything. Our Pultec output stage does not resemble an old Pultec at all and so, neither does its output transformer, which yes, we did design and we do build. The very first Manley mono Variable Mu design drew upon the Danish(!) DISA limiter for initial inspiration, but after ten years of building the Stereo Variable Mu, it really doesn't resemble any historic gear at all. It's its own thing.

Ya'll have some wild imaginations.

To clarify:

There are 14 x fourteen-pin custom inductors in the Massive that we designed and we wind in our in-house magnetics department. We design and wind all of our audio transformers and chokes, with the exception of one model of a very cool Lundahl tranny we use in the SLAM! and in the 16x2 Mixer. I have five winding guys on staff and you can see them in action here on our [[url=http://[/URL]="http://www.manleyla…"]factory tour[/]="http://www.manleyla…"]factory tour[/] page.

In addition to the 14 large inductors we make in the Massive there are also some off the shelf magnetic shielded ferrite inductors used for the smaller values needed, and why not? They are an excellent tool for the job and how much more expensive would you like that thing to be? As it is it is already too expensive and the price will be going up.

With the small value chokes we're talking about a few turns of wire around a fixed ferrite core so what is the difference whether we made that or bought it? There's nothing with those particular parts we could possibly do better by building them ourselves. We don't build capacitors or pots either. But the real important thing to do in the manufacturing process is select and match these kinds of parts, ain't it?

All the passive parts used in the Massive are measured, selected and matched for precise channel-to-channel accuracy. The band cards are built with pairs of matched cards with matched parts which are also further tested in QC to assure that each channel is a twin to its pal on the other side of the box.

As for the large inductors that we do make, there are several things we can do in building them that will make them better than what we could buy or what we could order from an outside supplier, such as precisely aligning the cores while measuring them as they are put on and locking them down so the values are consistant part to part. We take the time to do that while not all magnetics houses really pay attention to those kinds of things. Been there.

It is this kind of attention to detail that make that unit a precise instrument. There is much much more to a piece of commercially produced gear and the company behind it than just the schematic, guys.

There are many companies who will not provide any schematics to anybody. I am not a paranoid person. I am well confident in my company and my gear and our engineering abilities and the design decsions we make that I don't worry about a guy in Denmark wondering what's under the hood. I freely send out schematics to registered owners of our gear. If you guys want to sneak around, get friends to lie to me about their need for schematics and abuse that priviledge, well, you have to sleep with yourself at night and that's not my problem.

anonymous Fri, 11/15/2002 - 11:39


It is a pleasure to have you here. I have a great respect for your products. Please don't be upset. We are just curious to see how companies like yours design those great devices. I don't think we represent a threat to your company because we do these devices for ourselves, and as you said the final quality is in the quality of work, components and measurement. If you will look at all the projects here at GROUP DIY you will see that all the circuits are modified and the originals were just a source of inspiration. The GYRAF PULTEC has diferent amplifier stage and diferent transformers and STEFFENs PULTEC has no tubes or transformers. Or the 1176, or the SSL.
Even you have some products inspired from great old designs, and I don't think it is a shame to take great ideas and improve them. In analog electronics there is nothing new under the sun. We are now in the same position as you were at the beginning when you studied old designs.
Your devices are very expensive because of the manufacturing techniques and custom components, and I'm sure nobody can produce that quality at lower prices, so I don't see why schematics are a big secret. So if you agree that the schematics are not everything why bother.
It would be great if companies like yours would help us and give some inspiration.
Would you help us?

best regards

Kev Fri, 11/15/2002 - 11:41

Firstly let me say again that,
"I don't know what anyone is talking about"
However I did expect this thread to be noticed eventually. :rolleyes:

EveAnna, welcome to tech talk.

We don't buy Farnell anything.

Farnell is only a parts supplier and if the price was right and the part was good enough, you would. Here at tech talk we often use the phrase "Farnell part" to describe something that might be available from a Pro Supplier rather than a local enthusiast shop. It could be Farnell or RS or Digikey ... perhaps even Mouser. NO big deal. I often will be a number of the same items from a supplier and then pick the part with the spec most suited to my application. Some manufacturers call this " Pick and Place ". If that also means unwinding a few turns on an inductor made by another manufacturer. Common place with many Speaker and Cross-over builders.

It is this kind of attention to detail that make that unit a precise instrument. There is much much more to a piece of commercially produced gear and the company behind it than just the schematic, guys.

Agreed, I think if one was to backtrack through tech talk you would find I have said this on a few occasions. It is a long process to take any design from prototype through to production line and still make the intended quality and profit required to keep it in production. I have had a few Manley unit's open and mostly I have been please with what I see. However I must say there was one box I was asked to fix that had a distinctly lower standard than the others. I suspect this wasn't a Manley and told the owner what I thought. A company like Manley have to contend with commercial 'rip offs' of their products. I am not likely to be able to afford a new Manley unit but second hand one day I might. If I win the lotto put me down for a shinny new Variable Mu. :D I can dream.

I don't worry about a guy in Denmark wondering what's under the hood.

If that's the guy in Denmark I am thinking of, then also think it a little unfair to single him out as he has not been driving the mood of this thread. He has enough of his own designs and variants to keep him busy. A look at another schematic is just part of the fun of seeing what others have done.

If you guys want to sneak around, get friends to lie to me about their need for schematics and abuse that priviledge, well, you have to sleep with yourself at night and that's not my problem.

I am sure it is not the intention of those here to deliberately lie. The Manley gear is well respected and one would expect that on occasion it will be used as a measuring stick by which others will be compared to. I can't sleep at night and all I want to do is get up and start soldering my next DIY project. ;)

It is clear you are upset. I apologise on behalf of tech talk and hope you will visit again under a better circumstance.

We luv our DIY,
and that ain't gonna change.

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vanimal Fri, 11/15/2002 - 12:41

No I'm not upset about anything other than wrong information about me or my products or my company getting posted for all eternity when it is so easy to avoid if people would just go look up the info on my website or email me for a verification on any question they have before they post. We are a very open company that way. It is easy for me to get over being upset by simply popping into all these groups to correct factual errors that people post about me or my products or my company.

No big deal. I'm all about just the facts, ma'am.

I have no problem with DIYers because as you said we all started by exploring historic gear. I just don't have unlimited resources to offer help to any guy who wants to build a home-brew of one of our pieces when we have thousands of paying customers who we should be devoting our attention to and plenty more gear to design, improve upon, and build. Anyone is free to be armchair manufacturer and think they are more clever than us. They probably are. It's a whole different world from building a coupla compressors in your lab to sell to your buddies to creating a respected world-wide distributed brand. Have at it. It's a lot of work.

As for commercial rip-offs, we don't have to contend with them any more than Mackie or Aphex did... there's a legal system in place for that kind of thing, and hopefully there are people on this planet left with some morals combined with a spark of creativity who know how to behave professionally.

cjenrick Fri, 11/15/2002 - 15:39

Just for fun, why not try to figure out the Manley Massive Passive from the information available on their website ?
Between the pictures of the curves and controls, plus the specs, you never know! Get this great free circuit simulator, S.I Metrix, from:
Then use the schematics of the regular Pultecs available on Jakob's site:
then splice and dice the filter sections , run them on the simulator, get the graphs and compare with the Manley. Then try to get the real schematic and see how you did! Too much fun!

anonymous Fri, 11/15/2002 - 16:29

Hi Gang,
Could I possibly get a copy of the schematics? One thing I'd be very interested in how the designers got the 5670 tube to behave properly in a compressor. Most of the other companies currently making a Vari-mu design seem to use the 6ES8/ECC189. Right Jakob....

Also I have around here somewhere a large JPEG file for the Langavin AM-16 mic pre if anyone is interested. That's the one that is direct coupled, fully balanced and has no caps in the signal path. Perhaps I could send it to someone who could turn it into a PDF for us all??

anonymous Sat, 11/16/2002 - 05:49

Hi EveAnna - and all you others..

First of all, I'm sorry if you felt that i was trying to diz your products. Dont get me wrong - that is very far from my purpose.

I deeply respect many of your designs, and specially that you've been able to make your way in today's hard world of producing pro audio gear. That is no simple task indeed.

Let me clarify a little on my earlier comments..

"..Farnell inductors? We don't buy Farnell anything.."

What I ment was, taking into account how much hype is given to the inductor issue in the MassPass manual and marketing, I was puzzeled to find quite a few off-the-shelf inductors (in the audio path, that is - not just in some voltage stabilizing circuit as I expected) when looking inside.

And quite large inductance values are seen here, not just "a few turns of wire around a fixed ferrite core". The whole HPF/LPF section (the image)seems based on these!

I know wery well that Farnell dosen't manufacture these inductors, only that they sell it.. Quite cheap indeed :)

I've never tried to imply that you ONLY used these cheap inductors; The "real" multi-tap inductors are hard not to notice when looking at the PCB's. And I'm sure that they're all made to your very best standards!

But does this mean that you're the only company that will be able to make them? I think not..

There seems to be a lot of hysterical hype surrounding inductors (and transformers) these days - to me it seems like it's merely a (modern) way of trying to protect one's designs, by claiming that some esoteric and secret knowledge is involved - and needed. With today's limited knowledge on this area, this is a simple way of copy protection..

And for DIY-purposes, this kind of hype is dangerous, as it is really misinformation keeping people from understanding real-world issues.

Which brings us to the next issue, the possible use of a Pultec output transformer for the VariMu comp..?

"..Our Pultec output stage does not resemble an old Pultec at all and so, neither does its output transformer.."

No, I know. I wasn't referring to your version of the oldie, but to the original one (or at least our local variant, Tubetec), for which companies like Sowther are still producing transformers.

Looking at the VariMu schematic it struk me, that the output transformer's current, vindings and ratios very much resembles that used in the Pultec output stage - at least in the Tubetech version that i have taken apart. The output stages have quite a lot in common...

So here's the question: In your opinion, would'nt the Pultec output transformer - e.g. the Sowther 9530 - make a good (not perfect) substitute for the VariMu output transformer if someone was stupid enough to try her luck at a DIY VariMu?

The input transformer wouldn't present a serious problem to substitute, I think..

Remember, that we're NOT doing commercial rip-off's here - merely gathering inspiration, like when you first found the DISA schematic. And yes, i know - and love - the DISA range also :)

In the good old days - actually not that many years ago - it was common to supply a schematic with your users manual, making it easier for (some) techs to understand what was going on in the equipment - allowing simple modifications if needed, and inspireing future DIY'ers.

I know that you at Manley supply schematics for customers in trouble - and that is a really good service. I have often wished that e.g. FocusRite or AMS would do that - it would make maintenance much easier.

But - forgive me if I'm wrong - you still sound like you're quite protective and worried about us DIY'ers getting hold on schematics or "real" information about your products:

"...If you guys want to sneak around, get friends to lie to me about their need for schematics and abuse that priviledge, well, you have to sleep with yourself at night and that's not my problem.."

Why should anyone sleep bad at night over this?

..Other than maybe the designer, that knows that he's charging way too much money for a piece of equipment that's in reality very simple and cheap to make on your own? - I'm definetely not thinking that this could be the case here, but the sheer energy you put in being protective tends to point in this direction. Less paranoid people than I could easily be lead to believe this..

To sum up: Dont be afraid of us DIY'ers. We all love and respect your work, and we'd all give our right hand for owning one of your products, not just a more or less clumsy copy..

But this love will - and does - reflect in a deep interest in what is really going on inside..

Best Regards

Jakob Erland
Gyraf Audio

anonymous Sat, 11/16/2002 - 08:39

EveAnna said:

We design and wind all of our audio transformers and chokes, with the exception of one model of a very cool Lundahl tranny we use in the SLAM! and in the 16x2 Mixer

Out of curiosity, in the SLAM! are you using the amorphous core LL1636? I'm thinking of using this sucker for some API 312 preamps built up from 325 cards. Then again, you probably use a different one, optimized for tube impeadances.

EveAnna Said:

It is this kind of attention to detail that make that unit a precise instrument. There is much much more to a piece of commercially produced gear and the company behind it than just the schematic, guys.

Of course! Everything from component selection to layout to construction technique impacts the final product. In a commercial product you have even more to consider, like "is the faceplate both classy and funky", and "does it meet the saftey standards of the target market"...and more, much more. I'm sure even the product manuals are carefully considered....I know the manual for my Langevin DVC is probably the best written one I've read.

EveAnna said:

It's a whole different world from building a coupla compressors in your lab to sell to your buddies to creating a respected world-wide distributed brand. Have at it. It's a lot of work.

I can imgaine the differences...they're staggering! After having built up some Neve 1272 clones from the ground up, I can honestly say that I could not build these units in a competitive manner at a cost competative with folks like Vintech, Phoenix, or Great River. There's too much 'by hand' construction in the units I build to be cost effective. Add to that, the hard to obtain parts, that I can get away with in a 'one-off' design as opposed to a true production unit. In a commercial design you need to consider parts sources, and assembly techniques (in my DIY gear I like to use 24 position panel mount rotary switches with components soldered directly to them...that would be prohibatively expensive in production I figure).

I think Manley has done a great job (with both the Manley line, and the Langevin line) at presenting a high quality product, at realistic price points. The Manley name is synonomous with class and quality, and that's a direct result of your business/manufacturing decisions. Hats off!

As far as schematics go, I like to review various designs, and try and figure out what makes them tick...I'm really a hack, and not a designer (yet), so my interests are in broadening my exposure to a variety of design techniques.

I like to look at designs, and spot potential areas for improvement. For example, I'm currently undertaking the construction of an SSL quad compressor loosely based on the Gyraf clone with some changes to the audio path that I think will result in a better sounding compressor for mix-bus applications, yet still maintain the SSL aggressiveness.

Anyways, I've said much about nothing...good to see you drop by EveAnna. It's nice to see commercial product designers (like youself, Dan Kennedy, Geoff Tanner, Fred Forssell, and George Massenburg) on the 'net. Good luck with your 'rat infested' house (got that from your web site). I've got a couple of cats I could send you if you need help
(one of them could really use the exercise).



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anonymous Sat, 11/16/2002 - 09:05

At first, sorry that I messed up with my posting and text and everything, I quess there's an empty post below this one. :mad:

To EveAnn:

As so many of us are saying here, we definately do NOT want to make commercial products - some maybe want to sell a few copies folks or so, but mostly we just want to create items for our own use. Its just way too much fun to make gear for your very own custom use. For example, I build my stuff from parts of VERY high quality -not going to madness, but useably HQ. I like the idea of not having to compromise in costs because I don't have to worry about the selling price - and I can also build and edit features to my units that I need and no other unit can give.

Why? Because we can, and it's not even that hard!

I love getting new schematics - it's a great source of inspiration. I was particularly interested in the sidechain circuit of the VARI-MU.

And EveAnn, I think you're being a little rude here saying things about "some guy in Denmark wondering what's under the hood" -just because someone doesn't own a big company doesn't mean that he can't be a very very good designer.


vanimal Sun, 11/17/2002 - 20:40

A few things:

Ya'll are a clever bunch. No doubt. I never meant any insult by saying "I don't worry about a guy in Denmark wondering what's under the hood." What I do worry about is him posting misinformation based on what "seems to be" going on under the hood.

And quite large inductance values are seen here, not just "a few turns of wire around a fixed ferrite core". The whole HPF/LPF section (the image)seems based on these!

The whole HPF/LPF filter section is not based on the "store-bought" inductors. The LP section is and those use much smaller values than the Manley-wound multi-tapped chokes, milli- and nano-Henries as opposed to lotsa-Henries.

Onto magnetics "hype"... firstly I don't know anything about the oldie Pultec output stage nor whether that specific Sowter would work in our Variable Mu. That's for you guys to figure out what you can buy or make for your output stage. We already have an output tranny that we make.

Sowter is a great company and we used to use Sowter small signal trannies before we started up our own in-house magnetics shop. We set up own own winding facility because we were using more and more trannies (big and small) and chokes, getting into more and more special designs and the biggest advantage of having the shop in-house for us is absolute quality control. We see each layer going on and know exactly what's happening inside. In production manufacturing, when you buy transformers from any outside vendor things can and do change over the years, and sometimes not always in the direction you would like them to. The only way you can find out is cut one open every once in awhile and wonder "Hey, where did 7 sections of this 19 section output transformer go?" True case in point, (not Sowter in that case.)
So having this facility in-house results in consistancy in quality for us.

It certainly does not save us any money making them ourselves, with five winding guys, all the machines, all the inventory of wire, bobbins, and lams to keep in stock. It is not cheaper for us to make our own audio trannies and chokes.

Secondly, having everything right here means we can really go crazy with experimenting with new designs, materials, and winding techniques. When you are prototyping a new design with an outside house, you go back and forth a few times and each proto takes several weeks and after a few of 'em you just take it and move on, cuz you gotta keep moving or the design will never get finished. When we're working on a new transformer, we run calcs, then give winding diagrams to Joe and in a few hours we have a proto in our hands ready to measure and listen to. OK, didn't like that one, let's try... and the next day we try something else. The last tube amp output tranny we did, we ran through 19 protos in the space of about 5 weeks and got that sucker really dialled in. It's a great piece of work.

The third advantage is speed, and that does make things go smoother when we can't afford to get hamstrung on one part. I have a great guy, Joe, who runs that department and builds what we need when we need 'em so production runs smoothly.

But does this mean that you're the only company that will be able to make them? I think not..

Sure. Reichenbach, Jensen, Sowter, or Lundahl would be able to make anything we make. No problem for them. They already supply most audio transformers for the rest of the pro audio boutique manufacturers. They have their esoteric and secret knowledge, and we have ours. I am not debating that our trannies are better or worse than anything else on the planet, but I will say that there definitely is plenty of hard work, science, and esoterica that is used in developing good audio transformers, and producing them on a large scale, for anybody. We all have our different bag o' tricks.

We do think that our in-house winding department is worthy of some marketing mention because of what I typed above. I wouldn't call it "hysterical hype" but I do think that making our audio magnetics is an integral part of our design process, manufacturing abilities, and quality control and that does set us apart from just about every other pro audio boutique manufacturer I can think of. It's interesting, it is different, and so we market that. Why not?

Again, what suits ya'lls DIY needs is different from what we as a manufacturer need.

And lastly about dishing out schematics, and helping DIY'ers, I promise you, it is less about paranoia and more about resources, namely my personal time, of which I just don't have enough.

Gotta go. I hafta be on a plane to Japan for InterBee in a few hours...

Kev Sun, 11/17/2002 - 21:41

thanks for dropping by again.

I do feel honored and a little surprised.

Thanks for the info on the in-house winding expert Joe. I work in the Equipment Construction Department of a National TV Broadcaster. In fact at the moment I think I am the whole department. The numbers in the section fluctuate depending on what is being built or installed. Everything from OB trucks and Control rooms to simple cabling jobs or adapter boxes. I often get called the expert just because there is nobody else to blame. ;)

I know what it is like to have high stock levels and the accountants complain like crazy on stock levels. They would prefer I zero base everything but that just increases my lag time to delivery. Everything in the TV business is wanted yesterday and we need to respond to that.

Getting manufactures to supply materials as specified can be a art in itself. We had some triax cable tested and approved and the manufacturer went a head and made and delivered many kilometres of it. It was useless. BUT we didn't find out until much of it was cut up and terminated and many hours spent. It was all returned and we had to go again. We recycled as much of the triax connectors as we could ... within safety guidelines.

As far as the HPF/LPF sections and the guy from Denmark is concerned, we often have discussions here about how some things might be made. Many times we only have pictures to go by. We use terms like "looks like it ... " and " Farnell or RS component" to help put things into a bit of perspective that we in different countries can understand. The guys in the USA have it sweet. Gear all over the place and at great prices. Down-under here in Australia we don't get to see all the classy stuff. It took years before I saw a Distressor and have never flipped the lid. Still have not seen a RNP and not likely to soon either. The Digidesign MidiO only arrived a couple of weeks ago and as far as Manley goes ... the prices are intense. When I win the lotto I'll sign up for a VariMu. :D We use what resources we can and try to make the most of them.

In broadcast, I do get to see a few things early like the Euphonics and AMS Neve gear and a prototype Sony HD camera .... a few years back. now.

As far as DIY is concerned ... I'm an addict. I build at work and then I continue to build when I get home and even in my sleep. I have encouraged Group DIY to field questions here at tech talk and not to disturb the pro's like Joe Malone and Dan Kennedy. They have been very helpful but they need to be left alone to get on with earning a quid. I'm sorry if any of the Group DIY members have taken much of your time. However I would be surprised if they have taken any of your time at all.

I promise if we do have a legit question I'll come to you direct but only after we have thrashed it out here first and concluded we do have a question worth fielding. Some time back we had a Joe Meek question. The VC1Qsc was marketed as a Transformer'd Mic-pre. The instruction book made reference to the TX but there was no TX. A place on the circuit board for the TX but there had been some mod and a change of mind by the Meek crew. Ted Fletcher gave me a little of his time and told me of the new current sense (cs) idea and we talked about op-amps for a few emails. A charming and very smart man. In the end I didn't quite understand his current sensing bit.
Perhaps one day it will sink in .

Kev Mon, 11/18/2002 - 00:15

Originally posted by EveAnna Manley:
Oh I've been hanging around since Fletcher turned me onto it way back when...

of course !
but I was referring mainly to tech talk not just RO's top two forums .... ( the new designing the future is pretty interesting at times).

tech talk was almost closed at one stage and RO in general went through a few changes. Many of the originals moved on to the new playgrounds at ProSound and Gearslutz.

Things are pretty relaxed around here these days.

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anonymous Mon, 11/18/2002 - 10:13

After coming back to this long thread over the weekend I was a bit shocked at the way it turned. After debating with myself whether to post anything I figured I started this mess so I'd better at least say something.

First, my apologies to EveAnna about mispelling her name (I was just guessing off the top of my head on that one). Also, thanks to the few (our very small few) guys for respecting my wishes and NOT posting the schem to be whored out for any Joe blow to download. I suppose I am going out on a limb to trust the 4 or 5 guys to keep it to themselves and learn from it. Like it or not, it's become an historic circuit as well. I guess I took the Ponchus Pilate approach to give it to Jakob alone and be done with it. Lastly, my main thoughts and feelings on the subject. Manley makes the finest audio gear you can buy. PERIOD. The best sounding for the things they were designed for. The best constructed (I don't know why they even give out schems to the owners cuz they never break). And some of the greatest customer service in the industry. I'm not being a kiss-ass - if you've ever used it you would know.

Now I can go back to tinkering in my basement and hope my next little project actually works when I turn it on and I don't get electrocuted.


anonymous Mon, 11/18/2002 - 10:25

There are enough schematics on the net to design a knockoff of any EQ. Having a Schematic of the Massive Passive will not really do anyone any real good. Just pick the freq. points desired and start building filters.

Did you guys know that you can pull filter sections out of the EQP1A and MEQ5 and change termination loads there buy allowing manipulation of inductor/cap values and just sum the filters back togeather with a traditional summing node.

Start small on proto boards with op-amps to make things easy. Then after the filters start sounding good just replace the op-amps with tubes or transistors as personal taste directs. Heaven forebid you just may find yourself actually learning some real electronics rather than just copying someone elses sweat.

Don't get me worng! I am all for learning from other designs BUT There IS ENOUGH ON THE NET NOW!

Lounge Guy