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the_maniac
Joined: 10 Jul 2009
Posts: 111
Location: Austria - Europe
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| Posted: Sat Jan 22, 2011 10:52 am Post subject: |
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no the problem in my case and Revox case too are definitely the caps on the VDM ...
i am going to replace them next week with panasonic FC and put some glue on them
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the_maniac
Joined: 10 Jul 2009
Posts: 111
Location: Austria - Europe
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| Posted: Tue Jan 25, 2011 4:08 pm Post subject: |
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applied hot glue on the VDM Caps and the buzz is gone =)
thanks for the hint!
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the_maniac
Joined: 10 Jul 2009
Posts: 111
Location: Austria - Europe
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| Posted: Wed Jan 26, 2011 11:10 am Post subject: |
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bad news, the buzz is still here, the vdm connector had a bad connection so the buztt was gone but also the Vertical Deflection 
think i'm gonna trie Panasonic FC caps
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Sparky015
Joined: 12 May 2009
Posts: 1185
Location: Cleveland / Akron, OH
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| Posted: Wed Jan 26, 2011 12:27 pm Post subject: |
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I skipped straight to page three so I apologize if you've already done this or someone else has already recemmended this. If you haven't done so, put a ground strap from the two grounds that run between the convergence and ASTIG boards on the heat sink to a ground screw on the chassis as described in Mike Parker's section. All high pitched sounds went away when I did that on my machine, and the heat sink ran noticably cooler. You can try re-capping, but I honestly didnt notice a difference swapping out the the originals for high quality Nichicons.
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Revox
Joined: 13 Feb 2008
Posts: 158
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| Posted: Mon Jan 31, 2011 1:57 pm Post subject: |
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I Recaped this board and the buzz is still there!
I noticed that when i tuch the "little" caps around there (i think those yellow ones were very special) the buzz tone changes.
What to do know?
Fill the space around there with glue?
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Revox
Joined: 13 Feb 2008
Posts: 158
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| Posted: Mon Jan 31, 2011 2:43 pm Post subject: |
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Filled with glue and....
sh**** it is much louder than before!
When i put a metal screwdriver next to the caps, its getting louder. A plastic one has no influence on the noise.
The Picture below is not my VDM chematic, its an Old version of the VDM Board.
On the Picture you can see what caps i mean.
The Noise is nearly as loud as the Fans, and occur on all three yellow cabs.
I cannot find the right servicemanual for my Version (50-2330-02P) , but i think they must be 1u?
I am shure someone can help me out to choose the right substitution cause the seemed specail!
Working on the PJ, i noticed that the filament voltage is not stable. What a day of defeat yesterday.
I think the Filament voltage whent wrong for something about 40 hour, i hope this damaged my tubes not so much.
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