[GE] Mastr III Power amp update

[Chris Boone]

The brick could be intermittent..have seen that in other gear before......(I
hate when it happens too! :)
Usually heat stress cracks the substrate internally...and when warm or hot,
they go south...after cooling down, they work again.
Could use a hot air gun to heat it up and see it fails under hi temp...

Chris
WB5ITT

> -----Original Message-----
> From: ge-bounces at mailman.qth.net [mailto:ge-bounces at mailman.qth.net]
> On Behalf Of n griggs
> Sent: Sunday, November 14, 2010 8:19 PM
> To: ge at mailman.qth.net
> Subject: [GE] Mastr III Power amp update
> 
> An update on the Mastr III power amplifier....and I HATE when this
happens:
> 
> I opened the cover and checked for anything burnt or smelly - nothing but
a
> little dust.  I wiped the dust off, connected the cables and power meter
and
> powered the repeater up - 100 watts power!  (I HATE when that happens!)
> So....i'm going to let it cook and check it every so often to see if it
quits.  Oh
> and the M57719 is flat against the heat sink with plenty of grease on it.
> Someone on another list said they had a few that weren't flat against the
> heatsink due to the module having a slight warp.  A little milling took
care of it
> they said.
> 
> 
> Neal KC4YCM