Re: white paste
- From: "Ralph Mowery" <rmowery28146@xxxxxxxxxxxxx>
- Date: Sun, 23 Apr 2006 20:42:16 GMT
"Lostgallifreyan" <no-one@xxxxxxxxxxx> wrote in message
news:Xns97AED87027969lostgallifreyangmail@xxxxxxxxxxxxxxxx
"I.F." <dai.ode@xxxxxxxxxxxx> wrote in
news:E9R2g.57197$Nh7.51688@xxxxxxxxxxxxxxxxxxxx:
<Maestro Mysterieux> wrote in message
news:jkmn42p137mgtvpvtqgdep1o6gtv2dv4o1@xxxxxxxxxx
Hi,
I disassembled a guitar amp, in order to re-solder a bad solder
joint. Now, I need to put it back together.
The PC board has a metal plate screwed onto it.
That plate also screws on to the metal chassis.I disconnected the
plate from the chassis in order to get at the bottom of the PC board.
Between the plate and the chassis is some sort of white paste.
I want to get some more of it so that I can put on better coat; but I
have no idea what it is, what it is for, or where I can get some.
Please advise.
Alan
The white paste is heatsink compound, which is silicon grease loaded
with magnesium oxide. In the UK I find the easiest brand to get hold
of is servisol from Maplin, any electronic component distributor worth
dealing with should stock an equivalent product.
Mmmm, goop. :)
Once you get it, remove the old with a lightly parafin-soaked rag. (Or
white spirit), taking care not to rub against plastics which could build a
dangerous static charge of you did so.
Then apply as little of the goop as you need, Don't be tempted to over do
this, it's hard to squeeze out the surplus, and you'll get some VERY
overheated transistors in a guitar amp if you make that film too thick. If
the heatsink surfaces are very flat, a thin semitranslucent smear is all,
if they're standard extrusions, make it slightly thicker, definitely a
milk-white smear, but no more.
I second the very thin layer. It is not a very good conductor of heat, just
beter than air. The object is to fill in all the tiny spaces where you do
not actually have metal to metal contact. If too thick , then it will act
as a heat insulator and the transistor will actually run hotter.
.
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