If it cannot be tested with a multimeter it cannot possibly be any good. First rule of the diyer 
I removed all but one of the black disks
I do not believe they are ordinary disks
they are too heavy and jelly like
I do believe they are something like what Scott mentioned before
I believe they are something on the older side because one of the mods uses Signetics NE530 op amps which are on the older side
I still don't see how they can really do anything in the way they are used
now if the PC board rested on strips of this material I could see how they could insulate against chassis vibrations
I do not believe they are ordinary disks
they are too heavy and jelly like
I do believe they are something like what Scott mentioned before
I believe they are something on the older side because one of the mods uses Signetics NE530 op amps which are on the older side
I still don't see how they can really do anything in the way they are used
now if the PC board rested on strips of this material I could see how they could insulate against chassis vibrations
That 7805 regular is non original too I think
Here are some internal photos
https://www.dutchaudioclassics.nl/philips_cd650_cdplayer/
Here are some internal photos
https://www.dutchaudioclassics.nl/philips_cd650_cdplayer/
See?
Things like this boogered-up mess is most definitely due to.... PARANOIA!..... OBSESSIVE-COMPULSIVE-BEHAVIOR!
In simple terms, some poor nutbag spent too much time on the internet reading nonsense from other "guru's"
Things like this boogered-up mess is most definitely due to.... PARANOIA!..... OBSESSIVE-COMPULSIVE-BEHAVIOR!
In simple terms, some poor nutbag spent too much time on the internet reading nonsense from other "guru's"
Yes, that's what audio "mod" gadget sellers feed on. Their products are like the incredible, exotic herb pills that offer longer, healthier lives and after-market bits and bobs that are claimed to give you more fuel economy or at least make your car look or sound like it goes faster.
The whole concept of mods is to promise something extra to feel superior to the masses out there who just have plain vanilla products. Adverts use carefully massaged wording to stroke the ego and lower our defences against what we know to be suspect info. Spending on the products gives you something to crow about on social media too but once you're over the new toys or admit to yourself that they don't quite do what you hoped, its back to the humdrum of searching catalogues for newer bits and bobs that actually do something - anything that makes some kind of difference will do.
How to avoid being a serial dupe? Quit reading ads that promise physical impossibilities for expensive chunks of foam rubber or over-painted waste components that would otherwise be consigned to landfill. Then start reading serious topics like audio electronics - perhaps even a formal physics study course for background and learn some facts and reasons rather than wallow in consumer BS advertising, just like other consumers out there .
As a matter of interest, I understand there really is documented evidence that vibration affects audio amplifiers but damping just the components isn't the remedy - the PCB mounting system is what transfers most of the vibrational energy to the electronics and that's what a few manufacturers already treat without being specific about the results. Perhaps because domestic sound levels are too low to be a serious problem.
The whole concept of mods is to promise something extra to feel superior to the masses out there who just have plain vanilla products. Adverts use carefully massaged wording to stroke the ego and lower our defences against what we know to be suspect info. Spending on the products gives you something to crow about on social media too but once you're over the new toys or admit to yourself that they don't quite do what you hoped, its back to the humdrum of searching catalogues for newer bits and bobs that actually do something - anything that makes some kind of difference will do.
How to avoid being a serial dupe? Quit reading ads that promise physical impossibilities for expensive chunks of foam rubber or over-painted waste components that would otherwise be consigned to landfill. Then start reading serious topics like audio electronics - perhaps even a formal physics study course for background and learn some facts and reasons rather than wallow in consumer BS advertising, just like other consumers out there .
As a matter of interest, I understand there really is documented evidence that vibration affects audio amplifiers but damping just the components isn't the remedy - the PCB mounting system is what transfers most of the vibrational energy to the electronics and that's what a few manufacturers already treat without being specific about the results. Perhaps because domestic sound levels are too low to be a serious problem.
I was passing a wedding procession here on Saturday, and the music level caused by the truck caused resonance in my car...must have been more than 2 kW RMS from those things.
There is a custom here that a music system mounted on a vehicle plays music, the people behind dance on the way to the wedding. Sometimes in festivals too. Think loud repetitive bass, screeching falsetto vocals.
Live bands are fading away now.
Vehicle can be a cart to a light truck (11 ton GVW class).
They have speakers mounted at the back, think up to 5 foot speaker banks with huge- relatively speaking - speakers, each has 4 - 6 units of 10-15" speakers.
Typically, 4 to 8 will be on the back, driven by appropriate amps, on a truck, the carts use smaller speaker banks.
You are unlikely to be able to listen to such loud music at home for any length of time.
If you wish, look it up in military specs, the toughest would be for rockets / missiles, and sonar equipment in submarines.
Think springs, controlled density foam, and methods to actually measure the results.
At home, not likely to be needed, another OCD /snake oil theory in my opinion.
There is a custom here that a music system mounted on a vehicle plays music, the people behind dance on the way to the wedding. Sometimes in festivals too. Think loud repetitive bass, screeching falsetto vocals.
Live bands are fading away now.
Vehicle can be a cart to a light truck (11 ton GVW class).
They have speakers mounted at the back, think up to 5 foot speaker banks with huge- relatively speaking - speakers, each has 4 - 6 units of 10-15" speakers.
Typically, 4 to 8 will be on the back, driven by appropriate amps, on a truck, the carts use smaller speaker banks.
You are unlikely to be able to listen to such loud music at home for any length of time.
If you wish, look it up in military specs, the toughest would be for rockets / missiles, and sonar equipment in submarines.
Think springs, controlled density foam, and methods to actually measure the results.
At home, not likely to be needed, another OCD /snake oil theory in my opinion.
Those dots could simply be three layer foam, used in the wadding for plastic jar lids.
LDPE film / LDPE foam / LDPE film, it is extruded in 2 - 4 foot wide sheets, then the wads are punched out on presses.
Or, just heat one with a soldering iron and see, could be bitumen sheet, the kind used for waterproofing!
Or making bitumen washers, used here to hold roofing sheets to the metal support.
That is worth pennies, the skill is in convincing somebody to pay dollars for it...
LDPE film / LDPE foam / LDPE film, it is extruded in 2 - 4 foot wide sheets, then the wads are punched out on presses.
Or, just heat one with a soldering iron and see, could be bitumen sheet, the kind used for waterproofing!
Or making bitumen washers, used here to hold roofing sheets to the metal support.
That is worth pennies, the skill is in convincing somebody to pay dollars for it...
To the OP: try posting your pics and query on the "Tweaks/DIY" subforum of AudioAsylum. I bet some of those folks there will know what those things are - and a few will probably have used them. Fair warning: out-there stuff like carbon fiber mains receptacle covers, and the color of wire insulation are treated are serious/significant SQ upgrades there. But the threads can be a fun read.
cheers, Derek
cheers, Derek