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Author Topic: The Fairchild Thread  (Read 101268 times)

phantom309

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Re: AnaMod to Exhibit Analog Modeled Stereo Limiter
« Reply #15 on: March 31, 2009, 10:13:33 AM »

In lat/vert mode, the stereo signal is matrixed, separately limited and recombined in the matrix to stereo output. Left/Right bypasses this matrix.


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ssltech

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Re: AnaMod to Exhibit Analog Modeled Stereo Limiter
« Reply #16 on: March 31, 2009, 11:03:11 AM »

Yes, basically like using the Jensen M/S splitter & recombiner circuit... but with a pair of un-linked limiters in between.

The CLEVER part of doing it that way is that they do it using the transformers which the unit already uses, instead of putting MORE stuff in circuit.

Really, The 670's circuit beauty to me is that it's basically an input transformer, a (monster-paralleled equivalent) dual-triode and an output transformer. -The signal path is just as elegantly simple as that.

Keith
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MDM (maxdimario) wrote on Fri, 16 November 2007 21:36

I have the feeling that I have more experience in my little finger than you do in your whole body about audio electronics..

phantom309

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Re: AnaMod Stereo Limiter
« Reply #17 on: March 31, 2009, 11:30:39 AM »

heh.

Sometimes I marvel at my own density...it never occurred to me to use the 670 to process M/S.
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phantom309

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Re: AnaMod Stereo Limiter
« Reply #18 on: March 31, 2009, 12:09:42 PM »

so, no, that won't work...I had my own misconception about how that input works. Not worth the trouble to bypass the INPUT to the matrix.
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phantom309

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Re: AnaMod Stereo Limiter
« Reply #19 on: March 31, 2009, 12:45:11 PM »

While we're on this subject, have any of you guys (especially Larry J, Dave A and Keith) noticed more distortion on transients in Lat/Vert mode?




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Mike Cleaver

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Re: AnaMod Stereo Limiter
« Reply #20 on: March 31, 2009, 05:18:10 PM »

I almost hate to suggest we "borrow" an idea from another but much less authoritative "audio" board but how about a "New Products" section where manufacturers can post ONE blurb about their new creation and then may answer questions posed by forum members?
The ONE post idea doesn't take away from the advertising component, which during these tough economic times may not be viable for some of our smaller equipment builders.
If they want to further trumpet their product, let them buy a banner ad as others have.
And just to throw a wrench into the argument, how do posters feel about the "New Microphone" thread in this forum?
I'm fascinated by it and wish I could afford one of the mics.
The information on how it was developed, how parts are being sourced and assembled and the new original finish are things I want to know about.
I don't see how the Anamod post is any different but maybe we should consider a "New Products" forum or subcategory.
That way, possibly everyone will be happy.


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jetbase

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Re: AnaMod to Exhibit Analog Modeled Stereo Limiter
« Reply #21 on: March 31, 2009, 05:27:31 PM »

RMoore wrote on Tue, 31 March 2009 18:43

fwiw - I can imagine there is a market for a unit in this price range which can do the 670 thing..


What is 'the 670 thing'? I know they're revered, but I've never come across one to be able to use it.
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Haolemon

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Re: AnaMod Stereo Limiter
« Reply #22 on: March 31, 2009, 08:13:15 PM »

I haven't seen a single review of the 660.  Have any been published?  It is odd, since this thing has been out for over a year IIRC.
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Brian Kehew

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Re: AnaMod Stereo Limiter
« Reply #23 on: March 31, 2009, 11:50:15 PM »

I have yet to meet a single person (or married person) that prefers the 670 to a 660 as far as function. Most seem to like a good 660 better. The 670 doesn't seem to be just "two 660s", although that may be a result of setup/care. Is the anamod like "two Anamod 660s 500-series" or a modeled version of the 670? Who would know? ... and are they wearing Beatle boots?


BTW - the inevitable "this is not as good as" comments will come up - of course it's not. Ha - of course not, it's DIFFERENT thing with similarities of form and function a consumer can understand...

Anamod stuff seems great in each incarnation, I just wish they would make pizza smaller and cheaper, but nearly as good as the original.
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wwittman

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Re: AnaMod Stereo Limiter
« Reply #24 on: April 01, 2009, 12:09:34 AM »

okay, you might have met a single, married, person

I admit I almost always have SEEN (and so used) 670s,.

but I never preferred the 660 to the 670.

I suppose it's possible I didn't get enough experience with one to develop a preference.


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William Wittman
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Bob Olhsson

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Re: AnaMod Stereo Limiter
« Reply #25 on: April 01, 2009, 11:33:58 AM »

I never cared for how lateral/vertical mode muffled the sound on ours.

wwittman

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Re: AnaMod Stereo Limiter
« Reply #26 on: April 01, 2009, 02:22:49 PM »

well THAT'S true. I never used the Lat/Vert mode.

but in the left/right mode, I have no feeling the 660 sounds better

just half as many channels
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William Wittman
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MDM,

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Re: AnaMod Stereo Limiter
« Reply #27 on: April 01, 2009, 02:41:03 PM »

the 660 had different transformers, did not have the resistor network that the 670 had..

the resistor network would interfere with the way the transformers interface with the next stage.

the output tranny on the 660 I saw had a 20K input impedance and could tolerate some mA unbalanced, which would translate to a more 'solid' sound.. compared to an output TX which does not tolerate unbalanced current in the windings.

I understand from a post here a long time ago that the 670 used UTC A-series transformers for the output?
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wwittman

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Re: AnaMod Stereo Limiter
« Reply #28 on: April 01, 2009, 03:51:15 PM »

maybe.

but in practise, having them side by side, I never noticed I preferred the 660 or that it sounded better.

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William Wittman
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Nobtwiddler

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Re: AnaMod Stereo Limiter
« Reply #29 on: April 01, 2009, 05:43:20 PM »

Hey Dave;
                Maybe this will help.
As you know I don't own a REAL Fairchild, but I do have the ADL 670 version.
Which is supposed to be a clone.

Anyhow, recently I was working with a producer in my joint,  who wanted to use the 670 in Lat/Vert mode.
We switched the unit over, and noticed a distortion that wasn't audible in the stereo mode?

Tried a few different things, reducing input gain, different source material, release times, etc, etc, etc...
Always with the same result...
So in the end, we used it in the Stereo mode and moved on.

So the next day I called Anthony DeMaria to come over and take a look.
He brought his scope,a box of original new tubes, checked them and changed all the tubes, even in the power supply....!
(let me tell ya at this point I began to sweat!.....$$$$$)
But, (thankfully for me)  the same thing happened.

So I had him take the unit with him for further testing.

Long story short, he took the 670 over to Ken McKims shop and the two of them tried to figure this out.
After a day or two, and still no idea what was going on or why, Anthony rented an original Fairchild from one of the rental places in NYC. This unit had just been checked and calibrated so it was supposed to be up to spec.

Within a few minutes of them using this unit along side the ADL 670, they noticed that the original Fairchild did the same thing, and exhibited the very same type of distortion artifacts that my ADL did.

At this point they figured it was one of those quirks that the Fairchild is know for.
So after a few days of comparison testing, Tony brought the unit back to me.
When I asked him, what was the problem he said, heck if I know, I didn't design the damn thing, I just copied it~!

So I guess your unit is operating correctly



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