[Amps] More pictures of solid state amp project posted

[Dan Levin]

Thanks Roger.

Between the transistors and the copper heat spreader, we are currently using
Arctic Silver 5, which appears to be the best high end PC overclocker
oriented thermal material around.  We believe that it is better than the
materials readily available from the more traditional heat sink vendors -
but are always open to feedback.

NB: Even using AS5 we calculate the temperature delta at this joint to be
around 20 degrees C!

Between the copper heat spreader and the aluminum heat sink, we are using
Aavid Ultrastick - an easy to apply traditional thermal grease.  The surface
area between the copper and the aluminum is so large that the interface
material is much less critical.  We calculate the temperature delta at this
interface to be around .3 degrees C - not worth caring about.

                         ***dan

P.S. Thanks to all for the notes about Google's warning that K6IF.com is
infected.  We are in the process of fixing this, and will send out another
note when it is clean.

> -----Original Message-----
> From: Roger (K8RI) [mailto:sub1 at rogerhalstead.com]
> Sent: Tuesday, July 01, 2008 4:22 PM
> To: Dan Levin
> Cc: amps at contesting.com
> Subject: Re: [Amps] More pictures of solid state amp project posted
> 
> Dan Levin wrote:
> > For those of you who are interested in our project to build an "open
> source"
> > solid state 1500 watt amplifier, a bunch of new pictures have been
> posted to
> > http://www.k6if.com/Gallery1/ .
> >
> > There are now albums that show:
> >
> > - The components (as yet only partially assembled) of the prototype
> cooling
> > system
> > - Details of building and mounting the EB-104 RF amplifier modules
> > - The completed prototype automatic input attenuator
> >
> > The rest of the project website is now hopelessly out of date, but we
> hope
> > to have it redone and usable in a week or two.
> >
> > As always, comments, suggestions, constructive feedback, offers of
> help,
> > etc. are most welcome.
> >
> That's one impressive project and one I'd be interested in tackling in
> the not too distant future.
> 
> I'm wondering about the heat sink, or heat transfer compound between
> the
> transistor and copper.  Are you using the silicone compound there as
> well?  With todays computers we have had to go to much more efficient
> compounds to keep the device temperature in safe limits. Naturally they
> are much more expensive, but a little goes a long way if you can
> tolerate electrically conductive materials.
> 
> 73 and keep up the good work,
> 
> Roger (K8RI)
> > The Project Gamma Team
> >
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