Re: Noisy/hissy EDP (revisited)

["Jim Shepherd" <jmshepherd@hushmail.com>]

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Hi Joe,

I too had a similar problem with my double stack of cream colored
Echoplexi. One unit, in this case, the 2nd one I bought exhibited a
nasty rumble/hiss at the end of the loop. The original unit behaved
as it always had, no problems. Mine are configured as a Stereo set
as described in the manual using the brother sync jack and midi.
Annoying, and I could never figure it out. Both properly installed,
all units in the rack isolated from each other with plastic tabs...
I either incorporated the noise into the song or just left the
second unit off and repatched the feed.

What ended up fixing the problem for me was an upgrade to LoopIV
rom chips. I really don't see how upgrading the firmware got rid of
the rumble/hiss on the one unit. Perhaps Kim would have some
insight. Maybe it perhaps had more to do with pulling the EDPs from
the rack and having to reinstall them again.

I hate leaving it at that, because this is not voodoo, just the
application of appropriate, known technology. I just don't have the
test equipment (or the time) to investigate it... especially since
now both units are behaving themselves.

You might want to upgrade to LoopIV anyway, it's sweet having all
the new features.

On Fri, 23 Sep 2005 19:39:49 -0700 joe rut <joerut@lycos.com>
wrote:
>Hey there-
>
>I know this was a source of discussion on the list some time ago,
>but I've spent a couple hours searching/reading in the archive and

>I can't
>find anything that seems to have resolved this problem.  I'm using

>the cream-colored Oberheim EDPs with Loop III, 5.0.
>
>The problem:
>My loop is full of hiss.  I tap record once.  I tap it a second
>time to end the loop and there is a lot of hiss.
>This occurs even with nothing plugged into the EDP inputs
>This occurs even with input knob set to zero.
>With feedback set to zero, the hiss does not die away, but stays
>steady.
>
>This does not seems like an "improper gain staging" issue.  One of

>my EDPs does this and the other does not.  With both EDPs set
>identically, one is super hissy, one is only mildly (and
>acceptably) hissy.  (eg: A) With all knobs at 100% and no inputs
>into the EDPs, or B)
>input= Zero, output = any audible setting, mix and feedback = 100%

>and no inputs into EDPs.)
>
>The only visible difference between the two EDPs is that the hissy

>unit has a power switch with just a white dot on it, while the
>other
>actually says "on/off".  Could one of these be from a different
>manufacturing run in which there were different (noisier) parts
>used?  Is this
>a problem that can be addressed by replacing certain parts?
>
>Anybody else had this experience and found a way to address it?
>
>Thanks
>
>Joe Rut
>
>--
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