[Elecraft] KPA1500 Fan Noise Video posted

[Don Butler]

Paul …. The PS noise is minimal from my point of view.  The power supply fans do run continuously while the amp is switched on …. You can hear the PS fans at the beginning and end of the video when the fan speed is set at “0” .. all you’re hearing at that time is the PS fan … at power down right at the end you can hear when the PS fans stop.

Don, N5LZ


Sent from Mail for Windows 10

From: Paul Baldock
Sent: Saturday, June 2, 2018 8:38 AM
To: Don Butler; Elecraft at mailman.qth.net
Subject: Re: [Elecraft] KPA1500 Fan Noise Video posted

Does the power supply make any significant noise?

- Paul

At 11:01 PM 6/1/2018, Don Butler wrote:
>In response to N5ZC’s request  I just made 
>this short video to provide a listen to the 
>KPA1500's fans ... at least as they sound in my 
>shack.  Follow this link to view: 
>https://vimeo.com/273064144 In addition to the 
>KPA1500 the video also includes footage of my 
>Alpha 9500 and Icom PA1 
 each running with 
>their fans at maximum speed 
… to provide a 
>simple rather crude comparison. What do I 
>think?   I think that fan speed 1 and fan speed 
>2 on the KPA1500 are probably comparable to the 
>fans that are installed on the other amplifiers 
>as far as sound and efficiency are concerned and 
>likely provide a similar degree of cooling at 
>those speeds.   And, I think that fan speeds 3, 
>4, and 5 (which are indeed noisy) provide the 
>KPA1500 with enhanced cooling capability that is 
>simply not available on other amplifiers. Don, 
>N5LZ -----Original Message----- From: 
>elecraft-bounces at mailman.qth.net 
>[mailto:elecraft-bounces at mailman.qth.net] On 
>Behalf Of Richard Thorne Sent: Friday, June 01, 
>2018 5:55 PM To: Elecraft at mailman.qth.net 
>Subject: [Elecraft] KPA-1500 Fan Noise - YouTube 
>? 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 
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