This is topic ELMO OPTICAL SOUND PROBLEM in forum 8mm Forum at 8mm Forum.

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Posted by Thomas Smith (Member # 1889) on November 08, 2011, 10:49 AM:
i have a elmo st 1200hd the problem is background music and sound okay, but main dialogue is muffled and sometimes noisy
this varies on different prints,i have cleaned optical lens
both ends but one was hard to get to,optical bulb has been in
projector since i bought it in around 1977 ?
is the problem that i need a new optical bulb any info thanks
Posted by Osi Osgood (Member # 424) on November 08, 2011, 01:14 PM:
It might actually be the fault of the optical soundtrack as well. While some are rock steady in thier performance (I speak of the soundtrack), others can have a lot of pop, hiss and others fault in them.

Now, some of that can be cured with a very good cleaning of the film. Since the optical track is printed on, as is the film image, there is no harm done with a really good cleaning. Those optical tracks will make very clear each and every bit of dust that happens to find it's way onto that optical track.
Posted by Thomas Smith (Member # 1889) on November 08, 2011, 03:55 PM:
hello osi i will try that but i dont think all films would need
cleaning ? i will also try a new optical bulb thanks
Posted by Winbert Hutahaean (Member # 58) on November 08, 2011, 04:39 PM:
Hi Thomas, did you hear the sound like people speaking in the water??

if so you have the same problem with me here:;f=1;t=006402#000003
Posted by Thomas Smith (Member # 1889) on November 09, 2011, 06:22 AM:
hello winbert yes does sound as if under water have you found
the fault with your projector ? i will buy a new optical lamp
and clean optical lens and films if problem continues i will
stick to mag super 8 films
Posted by Winbert Hutahaean (Member # 58) on November 09, 2011, 06:42 AM:
Thomas my projector shows that only for certain films. So I guess the optical lamp need to be re-aligned. But I don't bother because I don't have that many optical films and moreover magnetic sound is more superior than optical.

Posted by Osi Osgood (Member # 424) on November 09, 2011, 01:55 PM:
Thomas, try to things ...

1. View the film as it passes through the optical lense area.

a. Is the optical lense "flickering" (like a flame?), that could mean that it is indeed getting neqar to expiration.

b. If the lamp's burning is steady and rock on solid, does the film, as it passes over the optical lamp, vibrate? (have a bend?). That is, is the passage smooth over the optical lamp or a "bumpy ride"?

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