Heatsink Damping?!

[jag]

Copied from this thread. Should, probably, be a new thread:

Originally posted by Faber
Great Job!
I will do the same thing for my Aleph-X :-)

I don't know why I forgot the use of wood in the past, but I think that it's useful especially when you have to put the amp in a room that is not dedicated to listening

Thank you for your Idea!

Bye ! Fabrizio

A quote from the Zen4 article:

"The amplifier is not very susceptible to noise pickup, and you can get good results enclosing it in a wooden chassis."

After I realized the amount of tooling required for aluminum-smithery, there was no choice. And, I am very happy that I did that. Infact I am having trouble with the other large metal surfaces - heat-sinks - I can hear them It started with a strange muddling of the highs. Now, the Zen is not supposed to do that! So, I put the Adcom back in - it was still there - must be the room. Do the standard room test - clap, listen; clap, listen - something is definitely wrong. And, what is the change to the room? The new Zen, go near it and clap again - offcourse you can hear the cursed things! Throw a blanket over it - and it is gone. But, the Zen will commit suicide if you leave the blanket over it for more than 30 minutes - will now have to find a proper location for it. Oh, what a relief that the front and back, atleast, are wood. No one else has seen this problem?!

[Nelson Pass]

MuuuHahahahahah.....

[Circlotron]

I once saw a picture of a Zundapp motorcycle that had little rubber blocks between the tips of the aluminium cooling fins on the cylinder head. These were to stop them ringing and making other sounds. Is this the kind of thing you are talking about?

[jag]

Originally posted by Circlotron
I once saw a picture of a Zundapp motorcycle that had little rubber blocks between the tips of the aluminium cooling fins on the cylinder head. These were to stop them ringing and making other sounds. Is this the kind of thing you are talking about?

That's probably what it is... my living room is devoid of any glass or metal surfaces (except a small TV - 27"). There is stuffed furniture placed at critical locations. The large heat-sinks are the only large hard surfaces and they add their (unpleasant) character to the room. After fiddling with placement, I have them tamed down (and they are now inaudible at reasonable volume).

Maybe, I should play with some rubber blocks... sounds like a good idea (now that you mention it, I think I have seen them too). On some models I have also seen a band (of some black metal) going across all the fins and kind of holding them together.

[Digi]

Originally posted by Nelson Pass
MuuuHahahahahah.....

Damn that is priceless, haha

Rob

[wuffwaff]

Mark Levinson (Madrigal) also put rubber blocks between the heatsink fins on their 331/2/3/4/5/6.


Oh and I once had a Zündapp with those rubber blocks, sounded very nice


william

[jag]

Originally posted by wuffwaff
Mark Levinson (Madrigal) also put rubber blocks between the heatsink fins on their 331/2/3/4/5/6.
william

Do you have any pictures that you can post. This is the only decent picture I can find for 336, and I do not see any rubber blocks there. The sinks are not even that big:

[jag]

See that band in the fins, that's what I was talking about. Any noise/vibration engineers out there?

[lieven]

the fins on both of my rotax carting engines broke even with these reinforcements.
Note that vibrations on these fins (3000-15000 Hz) are alot more violant than I expect on an amplifier.

Often I see layers of blue silicone encircling the fins to prevent resonating.

Same thing: fixing a harley by searching for lost bolts, hehe.

[wuffwaff]

Jag,

will take a picture when I´m at my parents for christmas.
I can remember how they talked about this in the product description and especially mentioned it.

william