[ICOM] Re: IC781 Power Supply

[Lee Mairs (SAG)]

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
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>
>
>