Re: [Elecraft] Humming KPA500

2017-09-03 Thread Richard Lamont
On 02/09/17 15:52, Clay Autery wrote: > Loose PS transformer? The assembly manual for the kit suggests that, although it isn't necessary, if you have a torque wrench you should tighten it to 55 inch-pounds. 73, Richard G4DYA __

Re: [Elecraft] Humming KPA500

2017-09-03 Thread F5vjc
Switching or variation of load on your AC supply? On 3 September 2017 at 00:43, pkhjr via Elecraft wrote: > Mine does the same thing. I opened it up last year and could not find > anything loose. Would like to get it resolved. > > Tex ka5y > > > > -- > Sent from:

Re: [Elecraft] Humming KPA500

2017-09-02 Thread pkhjr via Elecraft
Mine does the same thing. I opened it up last year and could not find anything loose. Would like to get it resolved. Tex ka5y -- Sent from: http://elecraft.365791.n2.nabble.com/ __ Elecraft mailing list Home:

Re: [Elecraft] Humming KPA500

2017-09-02 Thread Clay Autery
Loose PS transformer? __ Clay Autery, KY5G On 9/2/2017 9:40 AM, Dauer, Edward wrote: > KPA500 started a new routine today after several years of perfect operation. > It emits an audible hum at a frequency of 60 Hz with a rise and fall time of > 3 to 4 seconds. It’s just

[Elecraft] Humming KPA500

2017-09-02 Thread Dauer, Edward
KPA500 started a new routine today after several years of perfect operation. It emits an audible hum at a frequency of 60 Hz with a rise and fall time of 3 to 4 seconds. It’s just loud enough to be annoying. It continues whether the front panel power switch is on or off. It ceases only when