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Old 19th May 2012, 07:30 PM   #1231
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maybe you can get 1cm cut off of th sinks? thats the easy way

does the noise change with volume? and have you tryed with differnt sources?
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Old 19th May 2012, 07:31 PM   #1232
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by wengtech View Post
too bad, the height of chassis is not fit for 15cm, only 14cm.
that is why i lay them down, but it true the heat was trapped inside.
so i need a modification here.
do you have enough deepness for 3 of them , as I said previously , rotated for 90 ?

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....

yes, both.
sound like "bees" when the volume set to half, no music.
very little, but however i must eliminate them.
what sort of volume , with or without the source ?

do you have a scope ?
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Old 19th May 2012, 07:42 PM   #1233
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ZM. are yo thinking of making the sinks as a tunnel and use a slow fan?
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Old 19th May 2012, 07:47 PM   #1234
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exactly , same as was the case with amp originally in that case/box

there is no other way .........
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Old 19th May 2012, 07:54 PM   #1235
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ZM. i have some doubt that the chassis is 450+mm deep. but is sure is 300+mm deep
that will work if the boards is not way over 300mm wide
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Old 20th May 2012, 03:38 AM   #1236
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Quote:
Originally Posted by AudioSan View Post
maybe you can get 1cm cut off of th sinks? thats the easy way

does the noise change with volume? and have you tryed with differnt sources?
noise doesn't change with the volume.

Quote:
Originally Posted by Zen Mod View Post
do you have enough deepness for 3 of them , as I said previously , rotated for 90 ?

what sort of volume , with or without the source ?

do you have a scope ?
3sink rotated need 45cm and my chassis only 40cm.
the bees occur with the source, when i disconnect the source it is gone.
i use old pioneer cdplayer.

Quote:
Originally Posted by AudioSan View Post
ZM. i have some doubt that the chassis is 450+mm deep. but is sure is 300+mm deep
that will work if the boards is not way over 300mm wide
yes you are right not enough deep.
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Old 20th May 2012, 05:45 AM   #1237
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Old 20th May 2012, 06:02 AM   #1238
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Originally Posted by wengtech View Post
sound like "bees" when the volume set to half, no music.
very little, but however i must eliminate them.
Sounds like transformer buzz. Good grounding will help (ground the "body"/leg of the EI trafo properly) but when the trafo must operate very hard (close to its full capacity) there is nothing you can do to make it buzz-free.

Such looking trafo are common in my area too. They are written with "A" (ampere) capacity. But they performance is much lower than that, and is easily buzzing with class-A constant current draw. But if you're trafo is not hot then it is okay I guess.
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Old 20th May 2012, 06:20 AM   #1239
Jay is offline Jay  Indonesia
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Originally Posted by wengtech View Post
yes you are right not enough deep.
A slight improvement without having to cut anything is by turning the heatsink up side down (the pcb will be underneath). This way you give more room at the bottom and also less heat trapped.

The heatsink and the mosfet is capable of handling the heat, but using such L-shaped aluminum you have to make sure that the heat will quickly transferred from the mosfet --> L-profile --> heatsink --> air.

I have never used L-profile for class-A amp! If I have to I will use double L-profiles. Connections between heatsinks must be tight using compound after sanding the heatsink on level surface (I use glass surface). One of my amp is using similar intermediate profile but made of copper, not Al.
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Old 20th May 2012, 12:22 PM   #1240
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Quote:
Originally Posted by wengtech View Post
noise doesn't change with the volume.



3sink rotated need 45cm and my chassis only 40cm.
the bees occur with the source, when i disconnect the source it is gone.
i use old pioneer cdplayer.



yes you are right not enough deep.
it seams your bees is are a product of a groundloop in the signalway
do you have another source to try?
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