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racked console channels help (audix 35102)
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I'm Painting Again
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PostPosted: Wed Mar 22, 2017 8:38 pm    Post subject: Re: racked console channels help (audix 35102) Reply with quote

another thing I noticed is that the ground pins on the XLRs do touch chassis ground they're they type with the little tab you solder to the jack housing
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floid
re-cappin' neve


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PostPosted: Wed Mar 22, 2017 8:43 pm    Post subject: Re: racked console channels help (audix 35102) Reply with quote

It's not that the extra stage alters the response, but that the output of this stage may not like seeing that transformer's inductive load. It forms an LCR filter, the heart of many a passive eq.
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I'm Painting Again
zen recordist


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PostPosted: Wed Mar 22, 2017 8:55 pm    Post subject: Re: racked console channels help (audix 35102) Reply with quote

sort of makes sense .. I'm trying to keep up / understand what yr saying


For reference

it's the version 03 35102 - written in pen on the back of the modules frame - I see one NE5 something IC on the D253 card

my cards say

D253 issue B AND issue F printed on the board with the mic and line xfrmrs .. like huh?

and

D258 issue D on the card with the wasp switches
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floid
re-cappin' neve


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PostPosted: Wed Mar 22, 2017 9:09 pm    Post subject: Re: racked console channels help (audix 35102) Reply with quote

Here is the schematic i'm referencing
https://groupdiy.com/index.php?topic=28892.0
There are 2 pages. The first is more of a block diagram. In the very upper RH is a representation of amp five, the output, with pin numbers that correspond to the numbers on your transformer schematic.
On the second page is an actual schematic of amp five, in the middle on the left, which shows the caps and resistors I referenced.
The first thing I would try is desoldering the transformer and making temporary connections at those points to an output jack. If the frequency response is no longer skewed, this is the culprit.
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zen recordist


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PostPosted: Wed Mar 22, 2017 9:21 pm    Post subject: Re: racked console channels help (audix 35102) Reply with quote

I will try as that sounds DIY able

BTW thanks so much for taking the time to help.

I would think that the pro audio company that racked these would not have sent them out not representing 1/2 the spectrum .. but I guess it's possible

I sent an email to someone who's company (or old company) did the racking about the issue and I'm waiting to see if they weigh in

it's the schem for the v02 that's posted there and I have v03 ..not sure how different it is
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zen recordist


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PostPosted: Wed Mar 22, 2017 9:47 pm    Post subject: Re: racked console channels help (audix 35102) Reply with quote

ok so i desoldered the three wires from the transformer and connected them directly to the input of the analyzer - and same skewed response
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