8mm Forum


  
my profile | my password | search | faq | register | forum home
  next oldest topic   next newest topic
» 8mm Forum   » 8mm Forum   » Grounding your projector. Static noise on Beauer T610, and crackling slider.

 - UBBFriend: Email this page to someone!    
Author Topic: Grounding your projector. Static noise on Beauer T610, and crackling slider.
Matthieu van der Sluis
Master Film Handler

Posts: 373
From: Barendrecht, The Netherlands
Registered: Aug 2017


 - posted April 05, 2018 02:32 AM      Profile for Matthieu van der Sluis   Author's Homepage     Send New Private Message       Edit/Delete Post 
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?

 |  IP: Logged

Mike Spice
Master Film Handler

Posts: 421
From: none of your business
Registered: Jun 2017


 - posted April 06, 2018 10:22 AM      Profile for Mike Spice     Send New Private Message       Edit/Delete Post 
is it a hum or a buzz

a hum could be an earth problem, a buzz could be a capacitor leaking

 |  IP: Logged

Tom Photiou
Film God

Posts: 4837
From: Plymouth U.K
Registered: Dec 2003


 - posted April 06, 2018 03:10 PM      Profile for Tom Photiou     Send New Private Message       Edit/Delete Post 
The T610 i owned for a short while had crackling sliders and a lot of hum. Worse than the Eumigs. Thankfully, i stuck with Elmo.

 |  IP: Logged

Matthieu van der Sluis
Master Film Handler

Posts: 373
From: Barendrecht, The Netherlands
Registered: Aug 2017


 - posted April 07, 2018 07:54 AM      Profile for Matthieu van der Sluis   Author's Homepage     Send New Private Message       Edit/Delete Post 
I have also an Elmo GS1200, still not converted, so the Bauer is brighter and the light whiter which gives more beautifull colors.
Sound on the Elmo is indeed better.
Depending on what movie and reel size, I use Bauer or Elmo.
I regrat I didn't go for the Beaulieu 708 back than, so I had the best of both worlds.
Large reels, bright picture, great sound, perfect one time focus.

 |  IP: Logged

Oliver F. R. Feld
Master Film Handler

Posts: 447
From: Berlin, Germany
Registered: Jan 2010


 - posted April 07, 2018 08:16 AM      Profile for Oliver F. R. Feld     Send New Private Message       Edit/Delete Post 
Matthieu,
thanks for this marvelous definition of the wonderful Beaulieu 708!
I have the same problem with my Bauer T 600.
It’s extra disturbing when You use extern speakers.
I also think that it is an earth problem; but how to solve it?

 |  IP: Logged

Matthieu van der Sluis
Master Film Handler

Posts: 373
From: Barendrecht, The Netherlands
Registered: Aug 2017


 - posted April 07, 2018 12:16 PM      Profile for Matthieu van der Sluis   Author's Homepage     Send New Private Message       Edit/Delete Post 
I've made a sound record for this.
I've put the sound level all up
Here's a link to my Google Drive upload.
https://drive.google.com/file/d/1mqVGa77ixq3HMdr5-_8WUp85IrgOUvsy/view?usp=sharing

There is no film in the projectors while recording this.

[ April 09, 2018, 12:01 PM: Message edited by: Matthieu van der Sluis ]

 |  IP: Logged

Matthieu van der Sluis
Master Film Handler

Posts: 373
From: Barendrecht, The Netherlands
Registered: Aug 2017


 - posted April 09, 2018 12:04 PM      Profile for Matthieu van der Sluis   Author's Homepage     Send New Private Message       Edit/Delete Post 
I refreshed the link and hope it works now.

I also thought of trying a earted socket hahaha, and this helps a lot, but it is not taking the humming all away. When sound levels are high, there is still some noise.

 |  IP: Logged

Paul Browning
Phenomenal Film Handler

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


 - posted April 09, 2018 12:17 PM      Profile for Paul Browning   Email Paul Browning   Send New Private Message       Edit/Delete Post 
Temporarily remove the earth wire from the mains plug, and see if this cures it. If it does, you probably have a hum loop, due to too many earths connected at one point somewhere on the chassis, but its does sound like a leaky smoothing cap on the power supply.

 |  IP: Logged

Steve Klare
Film Guy

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


 - posted April 09, 2018 12:21 PM      Profile for Steve Klare   Email Steve Klare   Send New Private Message       Edit/Delete Post 
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...

 |  IP: Logged

Matthieu van der Sluis
Master Film Handler

Posts: 373
From: Barendrecht, The Netherlands
Registered: Aug 2017


 - posted April 09, 2018 12:42 PM      Profile for Matthieu van der Sluis   Author's Homepage     Send New Private Message       Edit/Delete Post 
Using a earthed socket helps a lot, but for that I needed a longer cable, to reach that.
The rest of the bit humming that is left, is just beautyfully exoplaned by Steve.

I think it is more striking to me when I just used my Elmo, and than switch over to the Bauer.
Light is better, sound is wors.
I keep forgetting that till it's there haha.

 |  IP: Logged

Steve Klare
Film Guy

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


 - posted April 09, 2018 12:48 PM      Profile for Steve Klare   Email Steve Klare   Send New Private Message       Edit/Delete Post 
-see what's happening here? More comparative hum!

Put the Elmos away for a couple of weeks and see if it "improves"!

It's easy to forget the most complex part (and important part) of the whole sound and viewing chain is the human nervous system.

(I have films that look really awful after a couple of glasses of wine, but that could be just a focus problem!)

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

 |  IP: Logged

Matthieu van der Sluis
Master Film Handler

Posts: 373
From: Barendrecht, The Netherlands
Registered: Aug 2017


 - posted April 09, 2018 12:56 PM      Profile for Matthieu van der Sluis   Author's Homepage     Send New Private Message       Edit/Delete Post 
Whuhahahaha, Steve your kiling me.
Next film needs to be with a bottle of whiskey.

 |  IP: Logged



All times are Central  
   Close Topic    Move Topic    Delete Topic    next oldest topic   next newest topic
 - Printer-friendly view of this topic
Hop To:

Visit www.film-tech.com for free equipment manual downloads. Copyright 2003-2019 Film-Tech Cinema Systems LLC

Powered by Infopop Corporation
UBB.classicTM 6.3.1.2