[Elecraft] KPA1500 Power Supply Fan Noise

[Dave]

It is the LED board in the PS.

Dave wo2x

Sent from my iPad

> On Jun 27, 2020, at 7:55 PM, exbpi at comcast.net wrote:
> 
> Hi Steve,
> 
> Thanks for the update.
> 
> So, this is the LED board on the amp, not the power supply? Guess we don't
> know at what serial number the change was made?
> 
> Mike
> K7PI
> 
> 
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On
> Behalf Of STEPHEN R ZUMBRUN
> Sent: Saturday, June 27, 2020 16:39
> To: elecraft at mailman.qth.net
> Subject: [Elecraft] KPA1500 Power Supply Fan Noise
> 
> Hello, all and Happy Field Day. Say I just wanted to comment about Elecraft
> service and the help they provided me to make a mod to my KPA1500. My
> KPA1500 power supply fan was rather noisy. I had seen discussion on the
> reflector about this so I contacted Doug at Elecraft service. He ask if I
> could solder.  I informed him I could and he sent me a new 22 ohm, 3 watt
> resistor and i swapped it out with the 10 ohm, 3 watt resistor on the LED
> board of the power supply. I am much pleased with the sound of the power
> supply fan now after the modification. My amp is an early serial number and
> the new amps come with the 22 ohm resistor on the LED board. So...if your
> power supply is a bit noisy you might consider this mod and contact Doug at
> Elecraft Service. The Elecraft part number of the resistor is E500128. 73,
> Steve W0SZ.
> ______________________________________________________________
> 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 exbpi at comcast.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 rocketnj at gmail.com