8mm Forum: GS 1200 sound question

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Topic: GS 1200 sound question

Larry Arpin
Jedi Master Film Handler

Posts: 953
From: Sunland, CA, USA
Registered: Dec 2006

posted December 17, 2013 12:44 PM

I just had a weird thing happen. When I turned on my GS it made a high shrill sound through the speakers. But it soon went away and I was able to watch my film. This morning I tried it again and the shrill came back. Then went away again. Is there something going out if anyone knows?

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Steve Klare
Film Guy

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

posted December 17, 2013 01:23 PM

I've had similar problems with my ST-1200HD, they have always gone away after I work all the audio related switches. Last time I remember it being the track selection switch.

This last time I was hooked into my amp and speakers, I'm lucky I didn't kill half the dogs in the neighborhood!

(Wife yelled down the stairs: "What are you DOING down there!!?)

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

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David Ollerearnshaw
Phenomenal Film Handler

Posts: 1373
From: Penistone Sheffield UK
Registered: Oct 2012

posted December 17, 2013 01:34 PM

I'm also getting noise on my GS. This seems to stem from the mag/opt switch it gives a very loud 'thud' every time you change it. Also I think this is also related to why the mag sound is not too good at the moment.

I must admit I hadn't used it for ages.

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I love the smell of film in the morning.

http://www.thereelimage.co.uk/

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Lee Mannering
Film God

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

posted December 17, 2013 01:42 PM

It’s usually related to switches. I spent a happy afternoon this year going over my GS machines with some ..

‘SERVISOL SUPER 10’

It is a very good quality switch cleaner/ lube and made a huge difference. Minor servicing of any cine projector is a must as with cinema projectors folks.

Depending on use I also clean the magnetic sound head and rubber film guides with

‘SERVISOL VIDEO 40’ head cleaner as well.

Perhaps a job new year for us all and on any sound cine projector?
Happy Chrimbo.

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Steve Klare
Film Guy

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

posted December 17, 2013 01:49 PM

The problem we run into here is switch contacts are metallic, and metals develop oxides. Above a certain voltage level it's a "don't care" because the oxide films can't withstand the voltages and they break every time you close the switch.

-then you get some flea power audio circuit and it doesn't bust the oxide films other then the mechanical action of the switch.

There's a simple solution: use switches with gold plated contacts.

I said "simple", I didn't say "cheap".

If it was an airliner or a medical instrument it would have the gold contacts, a consumer movie projector? No...

-and that's why 30 years later we are still losing audio and working switches.

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

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Larry Arpin
Jedi Master Film Handler

Posts: 953
From: Sunland, CA, USA
Registered: Dec 2006

posted December 17, 2013 03:20 PM

Thanks guys. I have electrical contact cleaner and will try that. Hopefully it won't come back.

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