My thought is that the cold transistors are gone and the other two 
are being overworked.  All four of mine are about the same temp., not 
at all too hot to touch.
Wiser heads can let us know if something has impacted these 
transistors or if they went over the hill on their own.
Nice follow through Tom.
PatAt 08:32 PM 11/26/2015, you wrote:
>Hi, everyone.
>
>
>
>Well, after a great Thanksgiving family dinner, at which I ate way too much,
>I came back home, and did some further testing of my RS35 power supply with
>my TS590, and think I have further confirmed a problem with at least two of
>the transistors in the supply.
>
>
>
>At the suggestion of Pat, Butch, and possibly others, I connected my TS590
>to a dummy load, and put it in transmit mode at 100 watts for about 3 to 4
>minutes.
>
>
>
>As you may know, there are four transistor sockets on the back of the
>supply.
>
>
>
>After several minutes at 100 watts into the dummy load, the two transistor
>sockets on the left-hand side of the supply were rather cool, with the
>bottom one being the coolest.
>
>
>
>However, the two transistor sockets on the right-hand side of the supply
>were almost too hot to touch.  To me, this does indicate that there is
>something going wrong with the transistors, in that I would think they
>should all feel equally hot or cold to the touch.
>
>
>
>Would anyone want to comment on exactly what this might mean, in terms of
>which transistors might be failing?
>
>
>
>It would seem to me that the ones that were almost too hot to touch would be
>the problematic ones, but I'm obviously not an expert on this kind of thing,
>so thanks as always for your patience.
>
>
>
>Tom Behler: KB8TYJ
>
>