About a year and a half ago I replaced the whole board on my VHF
MSR2000 110 watt NCD PA. (My PA had more problems than just the
transistors) I used the PA board out of a 110 watt mitrek mobile.
It took me an afternoon to do it as I recall. I had to remove the
power control circuitry and change some values of some resistors on
the input side of the mobile PA, but it still works great today with
a nice clean output.
MSR2000 PA's are notorius for failing, especially the NCD units. You
could not back the power down enough and still maintain a clean
output, no matter how much air you blew on and out of the PA. The CD
units faired a little better, but those darn ham operators could fry
them too! Ha! Ha!
Gary KB7TRP
--- In Repeater-Builder@yahoogroups.com, Neil McKie <[EMAIL PROTECTED]>
wrote:
>
> People have been wondering why I seem to 'collect' all those old
> used Motorola and GE radios. I usually 'collect' them at
swapmeets
> when the sellers can't give them away (except to me.)
>
> I finally unloaded almost all of the tube gear except one - even
> donated a GE MT-16 to a friend in the San Francisco Bay area
> sometime back.
>
> Why not? The manufacturers quit supporting them years ago.
>
> I have Motorola back to the later Motracs, Mocom-70's, Micors
and
> Mitreks.
>
> I have RCA to Series 700.
>
> I have GE in Mastr-Pro (very nice radio) Exec II and Mastr II.
>
> Those here who have seen my garage will ... groan ...
>
> Get down to your local ham swapmeet and start catching up. Of
> course, you'll raise the price to me ... but the parts will be
used
> by someone and not hit the scrap yard.
>
> Neil - WA6KLA
>
>
> skipp025 wrote:
> >
> > Do what most of us are doing, buy used Motorola
> > radios of the same era/type and lift the transistors
> > from surplus radios.
> >
> > I purchased 40 used mitrek 110 watt radios for
> > replacement UHF MSR PA Modules. Although the
> > remove and replace process takes some 3 plus
> > hours of serious work, the much lower cost
> > offsets the financial pain.
> >
> > The same would apply with with the VHF pa, which
> > also depends on whick of the 3 or 4 known VHF
> > PA versions you have.
> >
> > Ebay and the surplus radio dealers are good part
> > sources.
> >
> > cheers,
> > skipp
> > skipp025 at yahoo.com
> > www.radiowrench.com/sonic
> >
> > > > Anyone know where I can find MSR2000 finals?
> > > > I have a high band VHF MSR2000 with 2 blown
> > > > finals (one set), and would like to replace
> > > > all 4 if I can find a set of replacement transistors....
> >
> >
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