8mm Forum: Are metal spools ok for magnetic sound?

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Topic: Are metal spools ok for magnetic sound?

Melvin England
Jedi Master Film Handler

Posts: 707
From: Hull, East Yorkshire, UK
Registered: Feb 2016

posted February 16, 2017 02:13 PM

I have just purchased some films with magnetic sound, but are on metal / aluminium spools. Would this affect the quality of the sound with regards to erasing the sound track at all,please?

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"My name is for my friends!"

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Paul Browning
Phenomenal Film Handler

Posts: 1006
From: West Midlands United Kingdom
Registered: Aug 2011

posted February 16, 2017 02:23 PM

Only permanent magnets like on big speakers will effect magnetic film stripe both paste and laminated. These could be erased from such objects come too close to the film track. I've not heard of any metal reel or aluminium reel erasing a film sound track, metal can become magnatised if left on a permanent magnet on say a grinding machine, but even these can be de-magged with a special tool.

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Steve Klare
Film Guy

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

posted February 16, 2017 02:25 PM

No, especially so with aluminum reels since this is a non magnetic material.

I guess a steel reel could become slightly magnetized, but these fields are pretty weak compared to ones the film may experience from other stuff like a transport motor or an internal speaker, and we don't worry about those either.

I've got some films that have probably been on steel reels for 30 years and they sound fine.

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

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Melvin England
Jedi Master Film Handler

Posts: 707
From: Hull, East Yorkshire, UK
Registered: Feb 2016

posted February 16, 2017 02:41 PM

Thanks very much for that. I just had this vision of waking up one day,starting the projector, volume full blast and nothing there except hiss!

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"My name is for my friends!"

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Andrew Woodcock
Film God

Posts: 7477
From: Manchester Uk
Registered: Aug 2012

posted February 16, 2017 05:46 PM

Won't happen Melvin, not unless you keep your steel (not aluminium) reels close to a 1 Tesla Neodymium Magnet!

By then, I suspect you'd have bigger issues to worry about! [Big Grin]

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