[Elecraft] K3/100 power supply

[Mike Fatchett W0MU]

I have been running my K3's on a Samlex SEC 1223's for quite some time 
.  I have never had any issues with fan noise or switching noise.

I just purchased a Powerwerx  SS-30DV.  While someone said that 
Powerwerx has said that you could turn up the voltage, I submitted a 
ticket asking for the information to do this and they responded that 
this was not an option.  I bought it for our upcoming trip to J6 for the 
size and extra current capability.  I like the binding post on the back 
and the powerpole connectors on the front.

I have an Astron switching supply that would shut down on 20m from what 
I can only suspect is rf yet non of the other switchers have done this.

On 4/14/2011 9:40 PM, Doug Person wrote:
> Samlex are not reliable?  They are sold re-labled by Kenwood.  My two
> have been around for 2 decades, in constant use nearly every day.  They
> power everything in my shack.  If you look hard enough, you can find
> people with complaints about everything ever manufactured.  I guess if
> my Samlex failed, I would just fix it.  They aren't really that
> complicated.  The Powerex is well made, but I don't find the fan to be
> that bad.  The smaller the supply the more critical it is to cool.  The
> Powerex fan is just above the background noise.  The bottom line is that
> nothing is 100% reliable.  Even stuff installed on spacecraft.
>
> Doug -- K0DXV
>
> On 4/14/2011 8:40 PM, n5ge at n5ge.com wrote:
>> I use two 100 amp supplies here that are made by Walt Williams W5YUO  They are
>> quiet and bullet proof, but if you want one you will have to come to Texas, as
>> he only sells local and only makes them on order.
>>
>> They are very heavy, so shipping would be a problem...
>>
>> Tom
>> N5GE
>>
>> On Wed, 13 Apr 2011 16:51:03 -0700 (PDT), VK5ABQ<shanewh at gmail.com>   wrote:
>>
>>> Thank you for all your replies but I've found negative comments about most
>>> (the power supplies that is....
>>> boom boom)
>>>
>>> I found the following complaints/restrictions -
>>> Powerwerx : noisy fan
>>> Diamond 3000: poor reliability on later models
>>> Astron: Linear's are only suitable for 110VAC not 240. Some complain about
>>> fan noise and interference on their switchers.
>>> Samlex: poor reliability
>>> Barrett: $700.
>>> Kenwood: generates electrical interference on 80 and 160m.
>>>
>>> XP Power's CCM250 (sold by Amtex,
>>> http://www.amtex.com.au/power_pdf/CCM250.pdf) still looks interesting as it
>>> is convection cooled, weighs 780g and is very small. The 15V model can be
>>> trimmed down to 14.55V but I this may still be too high? Also only rated for
>>> 16A continuous and 20A peak. Cost is $380 and lead time 7 weeks. Yes,
>>> interest has diminished.
>>>
>>> Conclusion: I'll put off buying the K3/100 for now until I can bothered to
>>> have another look for an electrically and audibly quiet 20A power supply
>>> suitable for 240V.
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