[Hallicrafters] SR-400A PA cathode resistors

[rbethman]

Walt,

While I've never owned or operated an SR-400A, my $0.002 worth, is my 
gut telling me that you nee3d not only to replace them again, BUT to 
replace them with a HIGHER wattage version.

They are apparently dissipating at a higher wattage level than what has 
been in there.

It could be a design flaw - OR - the preceeding owner replaced them with 
a lower dissipation set.

Bob - N0DGN

Walt Cates wrote:
> On virtually all of the 400A's I have worked on the 13 ohm resistors in the cathode ckts have been discolored. They measure from 19 to 25 ohms. I have always replaced them and went on. My 400A which I restored only about a year ago had the same "problem" when I got it. After one year and probably less than 10 hours of actual TX time the power has began to drop off. I opened it today and you guessed it the 13 ohm resistors are way out of tolerance again. I haven't determined if this is the cause of the power drop off yet. But, I thought I would quarry the group to see if there have been any changes or improvements that I haven't heard of.
>
> Best Regards, Walt Cates, WD0GOF, http://www.myhamshack.com/WD0GOF/<http://www.myhamshack.com/WD0GOF/>
>
>