[Elecraft] KPA-1500 Fan Noise - YouTube ?

[hawley, charles j jr]

Some years ago we cooled a PDP11 by putting the fan remote and running a dryer hose to the computer. How about putting the fan in the basement and the rig on the desk where it’s handy?

Chuck Jack 
KE9UW

Sent from my iPhone, cjack 

> On Jun 1, 2018, at 7:57 PM, Michael Walker <va3mw at portcredit.net> wrote:
> 
> Bill is correct
> 
> You have to move air to cool down those devices and it takes fans to do
> it.  Water cooling might work if you wish to modify it.  :)
> 
> But, there is no free lunch as was mentioned.  Be prepared that any 1500
> watt LMDOS amp requires cooling but since there is no tube, they are built
> in smaller boxes, so you get smaller fans that have to move more air.
> 
> The B26 is somewhat quieter I think, but they worked on some things to make
> it quieter like extending the fan out the back so there is less disturbed
> air when it hits the fan blades.
> 
> They aren't that loud and if were good headphones, you won't notice at all.
> 
> my 2 cents, Mike va3mw
> 
> 
> On Fri, Jun 1, 2018 at 8:32 PM, Bill Stravinsky via Elecraft <
> elecraft at mailman.qth.net> wrote:
> 
>> Rich
>> 
>> You pretty much hit the nail on the head about solid state amps.  As they
>> say there's no free lunch.  Solid state has made great strides in high
>> power ampsbut its still solid state and a p/n junction or some form
>> thereof.  1500 watts of heat in those junctions has to be cooled down or it
>> won't be long before it needsnew parts.
>> Depending on your operating habits (contesting, casual, or whatever) there
>> will be varying degrees of fan noise.  The higher the duty cycle the higher
>> thefan requirements.  Pick your poison, a small light weight amp easy to
>> move around or one you need a fork lift to pick up.  I prefer tube amps for
>> a few reasonsand have the Acom 2000a (and an Alpha 89 that now sits in the
>> living room temporarily) but I'm still glad I got the kpa1500 at least so
>> far.
>> The kpa sits nicely on top of the Acom without causing the table they sit
>> on to crash to the floor in pieces, hi.  I'm surprised nobody has made a
>> you tube ofthe amp in operation actually.  But there are only just over 200
>> of the new amps out there.  Good luck with your investigation, Rich.
>> BillK3WJV
>> 
>>    On Friday, June 1, 2018, 8:00:29 PM EDT, Richard Thorne <
>> rthorne at rthorne.net> wrote:
>> 
>> This fan noise issue has me concerned to the point that I’m considering
>> cancelling my order.
>> 
>> While the amp won’t be on my operating desk, it will be on a rack next to
>> my operating desk.  Remoting the amp is not an option. Quite frankly I have
>> no interest in remoting the amp.
>> 
>> Is there anyone out there that has a KPA-1500 willing to post a YouTube
>> video so we can hear the fan in action and judge the noise for ourselves?
>> 
>> From the research I’ve done it appears that if you want a solid state amp,
>> regardless of make, you need to be prepared for fan noise.
>> 
>> Thanks
>> 
>> Rich - N5ZC
>> 
>> Sent from my iPhone
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Elecraft at mailman.qth.net
>> 
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to k3wjv at yahoo.com
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Elecraft at mailman.qth.net
>> 
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to va3mw at portcredit.net
>> 
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to c-hawley at illinois.edu