[ICOM] Re: IC781 Power Supply

[n6lrv at cox.net]

Lee,
Rob Sherwood's kit is available at this link;
http://www.sherweng.com/IC781Fan.htm
Gary
---- "Lee Mairs (SAG)" <lmairs at sagcorp.com> wrote: 
> Can someone point me to the Sherwood mod mentioned below?  My 781 has 
> been going strong for about 15 years.  I'd hate to lose it now.
> 73 de Lee
> KM4YY/8
> 
> 
> 
> mel martin wrote:
> >> The PSU was designed for the Japanese 100V mains supply. When fed from 120V
> >>     
> > mains, the shunt-regulator dissipation increases by a whopping 44%!
> >
> > Hi Adam...
> >
> > A while back someone actually ran temperature tests on the 781 power supply.
> > I think the data was on this reflector... At least a link to it. I
> > distinctly remember that the rise in ambient temperature with a 120V mains
> > supply as opposed to a 100V supply was trivial. The obvious conclusion is
> > that the mains supply not is not the issue... The power supply also ran far
> > too hot at 100V... So all those 781s out there running on Variacs are at
> > risk. What is needed is additional cool air. I use the Sherwood Engineering
> > kit... And it works very well.
> >
> > I wish I still had the reference. Perhaps someone can provide it.
> >
> > ----
> > Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
> > Icom Users Net: Sundays, 1700Z, 14.316 MHz
> > Icom FAQ: http://www.qsl.net/icom/
> >
> >
> >   
> ----
> Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/