I just got a very collectable Philips CD650 CD player.
I opened it up and someone put a whole lot of what what seem like foam rubber disks on IC's capacitors and the board itself. I have looked at other pictures of this model and these disks are not there. I have never seen disks like this before.
My question is what purpose could they possibly serve (and what are they )????
I opened it up and someone put a whole lot of what what seem like foam rubber disks on IC's capacitors and the board itself. I have looked at other pictures of this model and these disks are not there. I have never seen disks like this before.
My question is what purpose could they possibly serve (and what are they )????
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The previous owner (rightly or wrongly) has been trying to damp vibrations of the components to which the disks are attached.
very good answer ! I get the feeling some other changes might have also been made, the player works and sounds fine at least.
Well, at least they can do no harm - apart from maybe leaving a sticky residue if you try to remove them!
whoever did that also did some incredibly complex miniature upgrades to the OP amps in addition to some other mods I need to research
those heat sinks are on top of several components and then plugged into the new op amp sockets
I do not know yet what the two black towers behind them are
those heat sinks are on top of several components and then plugged into the new op amp sockets
I do not know yet what the two black towers behind them are
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Most of the information on this model is for the Magnavox version sold in this country as the model 650, I am digging deep to get answers, there are lots of mods for this model
One of the many nonsense ideas floating around is that capacitors/resistors/transistors/ICs "vibrate" and that hugely affects Sound 🙄
Consequently,many non-solutions have been offered for this non-problem.
One of them included some kind of repurposed Mom´s nail enamel or similar, claiming a beneficial Sound effect, go figure.
Those unnecessary foam pads may be supposed to be the same.
Like Enzo often says:"take two placebos, they work twice as well" 😊😊😊
PS: for those brave enough, I copypaste some of the BS accompanying that little enamel bottle:
https://steinmusic.com/project/maestro-laquer-cd-plus-ccs/
Consequently,many non-solutions have been offered for this non-problem.
One of them included some kind of repurposed Mom´s nail enamel or similar, claiming a beneficial Sound effect, go figure.
Those unnecessary foam pads may be supposed to be the same.
Like Enzo often says:"take two placebos, they work twice as well" 😊😊😊
PS: for those brave enough, I copypaste some of the BS accompanying that little enamel bottle:
https://steinmusic.com/project/maestro-laquer-cd-plus-ccs/
still trying to figure out what those 4 black components are
they have the shape of a power resistor
the ends look like epoxy
they have no markings
they are sets of 2 in parallel
they are where the capacitors should be, the standard mod at that spot is a pair of WIMA caps
they have the shape of a power resistor
the ends look like epoxy
they have no markings
they are sets of 2 in parallel
they are where the capacitors should be, the standard mod at that spot is a pair of WIMA caps
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Perhaps they are simply foil capacitors that have been painted black - in an attempt to output a darker sound! 😉
Well actually adding weight to the top of the large capacitors could make them more likely to experience vibration fatigue as there's more mass to store resonant energy. Some silicone rubber goop around the base to support large components and damp resonances is a better fix for that...
mmaghakian:
I suspect they're Marigo dots. Stereophile went berserk over them in the early '90s; the dots were described as made of multi-layer constrained energy-absorbing materials which, by converting unwanted vibrations into heat, would improve the sound of everything they were attached to. Marigo is still in business; see http://marigoaudio.com/z-dot-application/. In any event, I doubt they're doing any harm.
Check out Marigo's other products while you're at it; rather entertaining in my book.
Regards,
Scott
I suspect they're Marigo dots. Stereophile went berserk over them in the early '90s; the dots were described as made of multi-layer constrained energy-absorbing materials which, by converting unwanted vibrations into heat, would improve the sound of everything they were attached to. Marigo is still in business; see http://marigoaudio.com/z-dot-application/. In any event, I doubt they're doing any harm.
Check out Marigo's other products while you're at it; rather entertaining in my book.
Regards,
Scott
From a different point of view they are insulators and stop heat getting out so the parts will get hotter.
