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Topic: Grounding your projector. Static noise on Beauer T610, and crackling slider.
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Matthieu van der Sluis
Master Film Handler
Posts: 373
From: Barendrecht, The Netherlands
Registered: Aug 2017
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posted April 05, 2018 02:32 AM
Like the title sais, the T610 has a Static humming noise. When sound on the film is loud, i can't hear it, but without film or films with bad softer sound it's very destracting, and I need to keep the soundlevel low.
I've send this projector to van Eck for service, and replacing the belt, and normally they do a complete replacement servicepackage on this projector, for what is defective. Does the projector need to be grounded somehow? Can I fix this somehow? Or is this something that is normal on the T610?
Also I still have one cracling slider. Can I fix this, just by spraying contact cleaner in it from outside into the sliders slot?
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Steve Klare
Film Guy
Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003
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posted April 09, 2018 12:21 PM
To a certain extent this can be what our ears are used to from a piece of audio equipment.
If you turn on modern audio gear, you would really have a hard time pulling up hum. I have a Sony Amp that's not even that new: if I crank the volume up to levels that would be downright ear-splitting if there was a signal passing through, I may get a little hum.
If you fire up a TV or stereo or movie projector from 40 years ago, it sounds much worse. It probably always did, but hum was just part of day to day life back then and it was OK.
I'll give you an example of how this works: I run my projectors through an amp with a hum-rejection filter in between. When I go somewhere I have to leave all the external audio equipment home. (need room for other people and their luggage!) and I run on the internal speaker.
The first night I run this way it sounds absolutely awful! There is hum and hiss. A couple of nights later it's fine.
What changed?
Nothing but my own internal tolerance for the hum and hiss.
It's easy (and logical) to blame old capacitors for the hum we hear. Early on I went this route and replaced the filter cap on one of my machines with a brand new one of even larger value.
Did it help?
-maybe, but not nearly as much as I hoped it would. I think to a certain extent we are up against what 1970s designs could offer. Even if it's as good as it ever could be, it might not be that great by modern expectations (Try driving a fifty year old car: yes it's fun, but a little bit scary!)
The solution is either to grow 1970s ears or go external sound system and clean up the signal before you amplify it.
An old friend of mine had an even better solution: he decided to like the hum.
-He said it gave the sound "character".
-------------------- All I ask is a wide screen and a projector to light her by...
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