8mm Forum: Optical Sound on the GS1200

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Topic: Optical Sound on the GS1200

Paul Adsett
Film God

Posts: 5003
From: USA
Registered: Jun 2003

posted July 02, 2013 11:38 AM

Well I installed a new arm (with the metal insert) and it made no improvement in the optical sound situation at all. I have concluded that the optical sound design on the GS leaves a lot to be desired. I think things would have been a lot better if Elmo had left the pressure on the mag heads during optical playback, in order to stabilize the film passing over the optical head.
Anybody know the details of how Eumig tackled the optical sound design on their 800 series machine?

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The best of all worlds- 8mm, super 8mm, 9.5mm, and HD Digital Projection,
Elmo GS1200 f1.0 2-blade
Eumig S938 Stereo f1.0 Ektar
Panasonic PT-AE4000U digital pj

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Maurizio Di Cintio
Jedi Master Film Handler

Posts: 977
From: Ortona, Italy
Registered: Jan 2004

posted July 02, 2013 01:47 PM

Hi, Paul! If you apply a gentle pressure with a finger on the arm, opposite the area where the rubber roller is bolted, do you get any improvements? If so try increasing the pressure strength of the new arm.

Also check the lower black tensioner has proper tension.
Good luck

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Maurizio

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Lee Mannering
Film God

Posts: 3216
From: The Projection Box
Registered: Nov 2006

posted July 03, 2013 01:54 AM

Hello Paul. Some years ago I had a Eumig optical sound model and the sound was warbling all over the show. It took me what seemed forever to adjust it and it’s the only Eumig model I found to be really fussy (on optical obviously) on sound tracks played. My own GS machines I find excellent on optical and a whole different kettle of fish particularly with a much more powerful amplifier inside. It is amazing the sound quality that can be got from that minute optical sound track on 8mm and I fairly often run optical more as a curiosity due to some of the films that made the format. The French also had optical prints out and usually have excellent tracks.

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Paul Adsett
Film God

Posts: 5003
From: USA
Registered: Jun 2003

posted July 04, 2013 05:48 PM

Thanks for that info Lee. Good to hear that the GS1200 is in fact capable of very good optical sound. Clearly, my projector needs some adjustment of the capstan rubber roller pressure, or the small roller pressure to get everything just right for good optical playback.

--------------------
The best of all worlds- 8mm, super 8mm, 9.5mm, and HD Digital Projection,
Elmo GS1200 f1.0 2-blade
Eumig S938 Stereo f1.0 Ektar
Panasonic PT-AE4000U digital pj

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Hugh Thompson Scott
Film God

Posts: 3063
From: Gt. Clifton,Cumbria,England
Registered: Jan 2012

posted July 04, 2013 06:01 PM

Paul on replay, which is the test I did on mine many years ago,
was to place a little pressure on the sound unit,,which eliminated
any wow or flutter. I then replaced the rubber pressure roller
with the one from a ST1200. i have no skills in electronics or
engineering, I'm a builder for Christ's sakes, but substituting the
flat rubber roller for the "V" shaped roller of the GS solved the
problem of bad sound.
Since then it's been FUMEO for me

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