Good to know.    I have a  almost 30 year old 20A and a 15 year old 35A, 
but thus far never had a problem with either one.

73, Steve  KW3A

On 11/23/2015 10:31 PM, Butch Bussen wrote:
> Usually when those transisters fail, they short and the o v p kicks in.
> He needs to check voltage at the supply terminals and at the radio to
> see what is really going on.  I often replace those pass transisters
> with darlingtons for two reasons.  They don't take near as much drive
> current, less of a train on the driver transister.  This driver is often
> mounted on the board or on the bottom of the supply.  Other advantage of
> using darlingtons, such as ecg 247 or ecg 249, if I remember right, is
> they almost never short when they go bad.
> 73
> Butch
> WA0VJR
> Node 3148
> Wallace, ks.
>
>
> On Mon, 23 Nov 2015, Tom Behler
> wrote:
>
>> Steve:
>>
>> I know exactly where those transistors are on the RS35.
>>
>> I guess my growing suspicion is that something isn't as it should be in the
>> supply, and I'd rather be proactive, than reactive.
>>
>> Will let you know what I find out when I do the re-arranging this week-end,
>> maybe as early as Friday before the CQ WW DX contest!
>>
>> Tom Behler: KB8TYJ
>>
>>
>> -----Original Message-----
>> From: For blind ham radio operators [mailto:[log in to unmask]]
>> On Behalf Of Steve Forst
>> Sent: Monday, November 23, 2015 7:55 PM
>> To: [log in to unmask]
>> Subject: Re: Kenwood PS53 Power Supply Manual
>>
>> Tom,
>>
>> Sounds good.  As others have said, the supply is rated and was sold as a
>> match for a 100 watt transceiver.  It will work fine for you.
>>
>> Will be curious   to see  if it solves the problem.    I understand the
>> transistors on the Astron's can sometimes fail.  The 35A has 4 of them.
>>    You can feel them on the rear heat sink,  in the wide gaps between
>> the fins.  2 transistors in each gap.   Not sure if one or more of the
>> transistors failing would give  the symptoms you see, but perhaps.
>>
>> 73, Steve  KW3A
>>
>> On 11/23/2015 7:36 PM, Tom Behler wrote:
>>> Steve:
>>>
>>> Based on the specs for the PS53, and based on what you and others have
>>> shared, I am going to try the following approach, at least for now.
>>>
>>> I'm going to take the RS35 off line, and use the PS53 to run my TS590,
>>> the TW1, and MFJ998 auto-tuner.
>>>
>>> I have a switching power supply that will be quite adequate for the
>>> TMV71A, so will connect that rig to that supply separately.
>>>
>>> I probably won't get to this until the week-end, but I'll be sure to
>>> let everyone know what, if any difference I see in output power with
>>> this new configuration.
>>>
>>> Thanks to all for your patience as I continue to sort this through.
>>>
>>> Tom Behler: KB8TYJ
>>>
>>>
>>>
>>>
>>> -----Original Message-----
>>> From: For blind ham radio operators
>>> [mailto:[log in to unmask]]
>>> On Behalf Of Steve Forst
>>> Sent: Sunday, November 22, 2015 10:10 PM
>>> To: [log in to unmask]
>>> Subject: Re: Kenwood PS53 Power Supply Manual
>>>
>>> Tom,
>>>
>>> The TW-1 current draw is minimal.  The 998 auto tuner  needs 1.5 amps
>>> for tuning, but  while the tuning process is going on the radio is
>>> only putting out 10 or 15 watts, so current draw by the radio at this time
>> is
>>>     low.
>>>
>>>
>>> If running the amp, you are probably only driving with 50-60 watts,
>>> depending on band, so  plenty of headroom for the ps.
>>>
>>> If you are going to obsess about the power supply, maybe limit your
>>> barefoot operations to 80 watts.  The other station will never know
>>> the difference, and you will sleep better.
>>>
>>> I think this supply will suit your needs, but don't think I would  add
>>> more stuff to be powered at the same time.
>>>
>>> 73, Steve KW3A
>>>
>>> On 11/22/2015 9:48 PM, Tom Behler wrote:
>>>> Steve:
>>>>
>>>> Thanks for the Universal Radio link.
>>>>
>>>> I'll definitely check it out.
>>>>
>>>> I run the TS590, my MFJ 998 auto-tuner, and my TW1 off the RS35 via a
>>>> rig runner.  My thought is to run those devices with the PS53, if I
>>>> can get away with it.  Of course, my ALS600 has its own separate
>>>> power
>>> supply.
>>>>
>>>> I also have the TMV71A connected to the RS35 via the rigrunner as
>>>> well, but I do have a little switching power supply I could power
>>>> that
>>> with if needed.
>>>>
>>>> May ultimately have to bite the bullet and buy a new power supply,
>>>> but don't want to do that unless it is absolutely necessary.
>>>>
>>>> At the same time, I don't want to risk damaging any equipment, and
>>>> creating bigger problems.
>>>>
>>>> Tom Behler: KB8TYJ
>>>>
>>>>
>>>> -----Original Message-----
>>>> From: For blind ham radio operators
>>>> [mailto:[log in to unmask]]
>>>> On Behalf Of Steve Forst
>>>> Sent: Sunday, November 22, 2015 9:34 PM
>>>> To: [log in to unmask]
>>>> Subject: Re: Kenwood PS53 Power Supply Manual
>>>>
>>>> Tom,
>>>>
>>>> Here is a link to  the Universal Radio page on the discontinued power
>>>> supply, with some basic specs:
>>>>
>>>> http://www.universal-radio.com/catalog/hamps/2816.html
>>>>
>>>>
>>>> I'm not sure what the 16 amp  raiding you are finding on the unit
>>>> represents.  As a comparison" My old Astron RS-20 was rated at 16
>>>> amps continuous (I think until the cows come home) and  rated at 20
>>>> amps for a shorter duty cycle.  You shouldn't have any problem with
>>>> your
>>> supply.
>>>>        Maybe running 100 watt RTTY would put a strain on it, but  CW
>>>> is less of a duty cycle, and SSB even less.
>>>>
>>>> I think you run other stuff off  your main station supply, so  a 35
>>>> amp unit is probably better, but for what you are trying to do  now in
>>>> testing, just   hook it up  and see how it goes.
>>>>
>>>>
>>>> I would try and reconnect with as much of the existing wiring as
>>>> possible to the new supply, so you are comparing apples to apples.
>>>>
>>>> 73, Steve KW3A
>>>>
>>>>
>>>>
>>>> On 11/22/2015 9:10 PM, Tom Behler wrote:
>>>>> Hello, everyone.
>>>>>
>>>>>
>>>>>
>>>>> I tried to do a google search for the manual for the Kenwood PS53
>>>>> power supply, in order to get the specs on the unit, but ran into an
>>>>> interesting problem.  The manual is a scanned image file on the two
>>>>> web sites I found, and when I tried running it through the Jaws
>>>>> Convenient OCR process, the conversion process stopped in mid-stream.
>>>>> Then, I tried sending the file
>>>> to
>>>>> roboBraille, and got a message saying the conversion process could
>>>>> not
>>>> occur
>>>>> because the document was "read protected".
>>>>>
>>>>>
>>>>>
>>>>> Once again, if someone has a text version of the manual, please send
>>>>> it my way.
>>>>>
>>>>>
>>>>>
>>>>> [log in to unmask]
>>>>>
>>>>>
>>>>>
>>>>> In the meantime, I'll keep seeing what I can do here.
>>>>>
>>>>>
>>>>>
>>>>> Tom Behler: KB8TYJ
>>>>>
>>>>>
>>>>>
>>>>
>>>
>>
>>
>