A couple things to check. If you are comfortable taking the top off, 
check voltage across the caps.  Check output voltage with no load and 
turn supply off and take readingas as it dropps down.  If the cap is 
good and the regulator is working, it will hold for a while.  Usually if 
the pass transisters go, they short which fires the ovp circuit.  On 
many I have rebuilt I've used darlingtons as they usually open instead 
of short.
73
Butch
WA0VJR
Node 3148
Wallace, ks.


On Fri, 1 Jun 2012, Tom Behler wrote:

>    Thanks, Colin.
>
> I'm not too handy with soldering components and the like, so I may have to
> go the purchasing route.
>
> Perhaps if someone wants to use this one as a back-up, as John suggested
> earlier, I could make a deal and sell it at a nicely discounted price.  The
> supply is over 14 years old, and has been used rather hard, so the fact that
> caps, a regulator, or something may be starting to fail is not totally
> surprising to me.
>
> Again, I'll think on this for a few days.
>
> Keep those thoughts and ideas coming!
>
> 73 from Tom Behler; kB8TYJ
>
> ----- Original Message -----
> From: "colin McDonald" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Friday, June 01, 2012 10:21 PM
> Subject: Re: Could it be time to replace My old trusty Astron RS35 Power
> Supply?
>
>
>> could be, probably the caps, but it also sounds allot like a regulator
>> failing.
>> if the voltage is wandering all over the place like that, then the
>> regulator
>> isn't doing it's job, and that isn't just some caps.
>> I can see maybe a few volts of fluctuation when a load is put on the
>> supply
>> if the caps were going...but he said down to 2 or 3 volts? that's a
>> regulator.
>> Probably a pretty cheap fix if you want to go that route Tom...maybe
>> trickier to fix yourself if your not used to soldering etc...but the
>> regulator components are pretty simple.
>>
>> 73
>> Colin, V A6BKX
>> ----- Original Message -----
>> From: "John Miller" <[log in to unmask]>
>> To: <[log in to unmask]>
>> Sent: Friday, June 01, 2012 8:15 PM
>> Subject: Re: Could it be time to replace My old trusty Astron RS35 Power
>> Supply?
>>
>>
>>> It's probably the capacitors going in it, that happens after a while and
>>> they're easy to replace only held to the board with a couple screws.
>>> Parts
>>> can still be gotten. I know a few who've had that problem. If you decide
>>> to
>>> get a new one, probably another of the same thing is your best bet or
>>> going
>>> up on the amperage though I used to run all that and then some off mine
>>> and
>>> it never complained. If you get to the point you just don't want to deal
>>> with it and do want to buy something else, Let me know, if my front steps
>>> don't cost too much I'll buy it off you and fix it up for a backup.
>>> ----- Original Message -----
>>> From: "Tom Behler" <[log in to unmask]>
>>> To: <[log in to unmask]>
>>> Sent: Friday, June 01, 2012 9:54 PM
>>> Subject: Could it be time to replace My old trusty Astron RS35 Power
>>> Supply?
>>>
>>>
>>>> Hi, folks.
>>>>
>>>> I know we have had similar discussions on the list before, but tonight I
>>>> feel I have discovered something that may be of interest to others.
>>>>
>>>> Basically, over the past few days, I have found that even when
>>>> transmitting
>>>> on the resonant frequency of an antenna with a 1.0 to 1 SWR, my TS590
>>>> seems
>>>> to fold back to an output power of approximately 50 watts.  These power
>>>> readings have been obtained from both the meter on the TS590, and my TW1
>>>> talking watt meter.
>>>>
>>>> I thoroughly checked all coax and DC power connections, but everything
>>>> seemed ok.
>>>>
>>>> I measured the power supply's voltage first with no load, and it was
>>>> 13.35
>>>> volts consistently.  However, when I transmitted in RTTY mode with 100
>>>> watts, thereby putting a full load into the circuit, the DC voltage
>>>> readings
>>>> started fluctuating all over the place.  They ranged from a high of 10
>>>> volts, to as low as 2 or 3 volts.  Then, on a whim, I connected the
>>>> Kenwood
>>>> PS53 power supply that I got with the Kenwood 570 I purchased from the
>>>> estate sale in our area, and the output power readings were a very solid
>>>> 100
>>>> watts, even when the rig was keyed down continuously for several
>>>> minutes.
>>>>
>>>> I know there is a way to adjust the voltage in the RS35, but with the
>>>> foldback of the ts590, and the fluctuations in voltage readings, I'm now
>>>> getting a bit nervous about using the RS35 as my main supply.
>>>>
>>>> Does anyone have any thoughts or similar experiences to report?
>>>>
>>>> If I do need to be in the market for a new power supply, I have several
>>>> requirements:
>>>>
>>>> 1.  I'd like it to be a linear supply
>>>>
>>>> 2.  I'd like it to be something that could deliver at least 40 amps
>>>> continuously through my rigrunner, because I sometimes run the TS590, my
>>>> TMV71A, and my TMV7A packet set-up simultaneously.
>>>>
>>>> If anyone has specific suggestions regarding a supply that I might wish
>>>> to
>>>> consider, please let me know.
>>>>
>>>> 73 from Tom Behler: KB8TYJ
>>
>
>