8mm Forum: GS-1200 sound help needed

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Topic: GS-1200 sound help needed

Steven Sigel
Jedi Master Film Handler

Posts: 701
From: Massachusetts
Registered: Jun 2003

posted June 14, 2012 01:50 PM

I've got a GS-1200, the optical sound is fine, but when playing magnetic sound, if the volume is low, it's o.k., but if you turn it up, there is a squeal almost like a feedback loop. Any ideas? Thanks!!

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Hugh Thompson Scott
Film God

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

posted June 14, 2012 01:56 PM

Hi Steve,for what it's worth,have you checked all the switches
at the rear of the machine,like "off" and "neutral" and theres nothing causing a short across the soundhead wiring.

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Steve Klare
Film Guy

Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003

posted June 14, 2012 02:33 PM

My ST-1200HD was vulnerable to this problem because of the switch activated by the record key. Working the switch used to fix it, then even this wouldn't work anymore and I soldered a short across the contacts that were supposed to be closed circuit in playback mode and removed the wire to the contacts for record mode. (Don't really want to know what happens if they are both closed at the same time...)

It's been quiet ever since, but I suppose I really should get a new switch and fix it for real....

--------------------
All I ask is a wide screen and a projector to light her by...

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Paul Adsett
Film God

Posts: 5003
From: USA
Registered: Jun 2003

posted June 14, 2012 03:05 PM

Make sure the PA switch is OFF.

--------------------
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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Steven Sigel
Jedi Master Film Handler

Posts: 701
From: Massachusetts
Registered: Jun 2003

posted June 14, 2012 03:06 PM

I believe I did check all the switches, but I will give it a try again...

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Gary Crawford
Jedi Master Film Handler

Posts: 979
From: Manassas, VA. USA
Registered: Jun 2003

posted June 15, 2012 06:49 AM

I have that problem with my Gs every so often....I found that , for some reason, the record function switches on at the same time the playback function is on....so when you turn up the volume on playback...it essentially creates feedback on itself. I usually just keep pushing in the back record button and the front panel two red record levers.....and eventually the record function kicks out and all is well again. I also mess with the P.A. switch as well. I've never failed to get it straighened out. Hope this helps.
Gary

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Steven Sigel
Jedi Master Film Handler

Posts: 701
From: Massachusetts
Registered: Jun 2003

posted June 15, 2012 09:47 AM

Thanks Gary..
I'll go play with it tonight and see what I can manage...

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Gary Crawford
Jedi Master Film Handler

Posts: 979
From: Manassas, VA. USA
Registered: Jun 2003

posted June 18, 2012 11:04 AM

hope you had some success on getting that squeal out of there. On mine, it seems to be either one channel or the other...not both. and since it has to do with the record function kicking in while in playback, the squeal goes away in opitcal playback....at least that's been my experience.

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