Tom,
I agree with Butch - replace the pass transistors and the driver 
transistor and you are probably good for another fifteen years.  If 
you would move to Glen Ellyn or Wheaton I have a couple of competent 
friends who could do repairs, but the way it is you are too damned 
far away for a lunch-repair trip!
And didn't you say you had a 30 amp. switcher - should do all you 
need with headroom and fill in until you get the Astron fixed.  I 
have an extra Astron meterless 35 amp. supply you would be welcome to 
use, but mailing would be pricy!  But it's here if you would like to use it.
PatAt 06:46 PM 11/27/2015, you wrote:
>Butch, Pat, and all:
>
>Well, after last night's test of my RS35 transistors, where I discovered
>that the two transistors on the righthand side of the supply became much
>hotter than the left while running the 590 with 100 watts into a dummy load,
>I then decided to take some more power readings.  I took the readings both
>with the internal meter on the 590, and with my TW1.
>
>You may recall that, the other day, the readings were 75 watts out according
>to the TS590 meter, and 58 watts out according to the TW1, and the supply
>meter read 13.8 volts and said I was drawing around 11 amps.  This time, the
>readings were better, meaning that   My output power readings were much
>closer to full power according to both the TS590 meter and my TW1.
>
>I then asked my sighted XYL to take a look at the meters on the RS35 power
>supply itself.
>
>Even though the voltage seemed to be at a constant 13.8 volts while
>transmitting into a dummy load at 100 watts, my XYL noticed that after a few
>minutes, the current readings on the RS35 ammeter began to fluctuate.  They
>would fluctuate anywhere from 14 amps, to 18 amps.  When I checked the
>transistor heat sinks on the back of the supply for temperature, I again
>found the same variation--the left-hand ones were nice and cool, while the
>right-hand ones were almost too hot to touch.  Furthermore, my XYL noticed
>that when I touched the heat sinks, the amperage values on the meter
>fluctuated as well.
>
>I don't mean to be obsessive about this, but this supply is making me
>nervous.
>
>I think that I'm just going to bite the bullet and replace it, and then take
>my time working with someone in my local club to see if we can fix the
>supply so I can at least have it as a backup.
>
>I really would like to continue being able to run both my TS590 and TMV71A
>with my rigrunner, so will be sure to purchase a supply that would be
>adequate for the job.  I know some have recommended another RS35, and I
>might just go with that, since I would prefer a linear supply.  However, I'm
>always open to other recommendations if anyone has them.
>
>In the meantime, I've got one or two  backup options, including the TS53, to
>at least keep me on the air, both on HF and VHF/UHF.
>
>Tom Behler: KB8TYJ
>
>
>-----Original Message-----
>From: For blind ham radio operators [mailto:[log in to unmask]]
>On Behalf Of Butch Bussen
>Sent: Friday, November 27, 2015 6:09 AM
>To: [log in to unmask]
>Subject: Re: RS35 Transistors
>
>The hot ones are likely good as they are in series with the load, that is
>why those supplies are called series regulaters.  I'd replace all four from
>the same vendor so you have sort of a matched set.  Should be able to get
>those from mouser or some one.  You will also need some silicon grease.
>When you pull the transisters, watch for the thin mica insolater that is
>between the chassie and transister.  Some times these stay stuck to the
>chassie, or heat sink, and some times they come with the transister.  You
>don't want the transister actually touching the heat sink.  A small bit of
>silicon grease is used between insolator and transister and between
>tinsolator and heat sink to help with heat transfer.  I'll have to see if I
>can find the number, but if I were doing it, I'd go with darlingtons, I
>think e c g 247 or e c g 249 which are the same, but higher current.
>73
>Butch
>WA0VJR
>Node 3148
>Wallace, ks.