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Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
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| Posted: Wed Jul 01, 2009 10:04 am Post subject: |
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Thanks, that is very interesting  .
When you said that at 75 Ohms the circuits work better, what does it mean exactly ? The video signal going through them, would be cleaner ?
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1031
Joined: 22 Mar 2006
Posts: 657
Location: Finland
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Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
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| Posted: Wed Jul 01, 2009 12:21 pm Post subject: |
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What are usually the number of hours of use before caps begin to increase their impedance?
If I say that mine have 12 000 hours, do you think it is the time to change  ?
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Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
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| Posted: Wed Jul 01, 2009 12:22 pm Post subject: |
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What are usually the number of hours of use before caps begin to increase their impedance?
If I say that mine have 12 000 hours, do you think it is the time to change ?
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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1031
Joined: 22 Mar 2006
Posts: 657
Location: Finland
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Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
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| Posted: Wed Jul 01, 2009 1:36 pm Post subject: |
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Ok. I will start with the big caps on the Power Supply, all the caps of th RGB switcher and RGB analog input boards.
What are the other boards which would have an influence on the picture quality ?
What about the 3 video amp boards?
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Wed Jul 01, 2009 4:38 pm Post subject: |
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| Corleone88 wrote: | | What about the 3 video amp boards? |
Absolutely, you will see a sharpness increase, color saturation, less noise (snow), etc.
A cap doesn't go bad from just high run hours, they dry out from just sitting ion the shelf. That's why they have a date-code on them. IT's like canned vegetables, they don't last forever. 
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Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
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| Posted: Thu Jul 02, 2009 9:30 am Post subject: |
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Does the caps voltage needs to be exactly the same for a replacement?
I have for example 100microF 25V to replace 100microF 16V and 470microF 35V to replace by 470microF 16V?
Is it OK?
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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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| Posted: Thu Jul 02, 2009 10:58 am Post subject: |
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| Corleone88 wrote: | Does the caps voltage needs to be exactly the same for a replacement?
I have for example 100microF 25V to replace 100microF 16V and 470microF 35V to replace by 470microF 16V?
Is it OK? |
Yes, it's ok.
For input bipolars you can also try small plastic caps (0.1-1uF) in parallel with el-bipolars, those should help with high freq signals.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
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| Posted: Thu Jul 02, 2009 3:54 pm Post subject: |
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What are input bipolars? The electrolytic caps on the port 3 RGB board?
What are el-bipolars?
Is 40KHz (1080i@72Hz) a high frequency ?
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1031
Joined: 22 Mar 2006
Posts: 657
Location: Finland
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Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
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| Posted: Thu Jul 02, 2009 6:29 pm Post subject: |
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Ok thanks. But where are the input bipolars?
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