All, I don't have the noise you describe, but it's logical to me that if the bolt that goes through the center of the transformer has any slack in it, it might cause a click or thump when cooling or heating. That may be why Elecraft used the bell washer under the bolt head to allow expansion and contraction of the transformer during operation.
Check the nut on the bottom side and see if you can pass a piece of paper between the bottom reinforcement plate and the nut while the power supply is cold Don't hold it upside down while you do this. If you can, the nut is not seated. It's easy to accidentally leave a self locking nut loose, due to the torque resistance from the locking material in the nut. Hope that helps. 73, Tom Amateur Radio Operator N5GE ARRL Lifetime Member QCWA Lifetime Member "If somebody has a bad heart, they can plug this jack in at night as they go to bed and it will monitor their heart throughout the night. And the next morning, when they wake up dead, there'll be a record." --Mark S. Fowler, FCC Chairman, 1981 - 1987 On Thu, 8 Dec 2011 12:37:37 -0500, Joe Word <[email protected]> wrote: >My KPA500 has developed a heat expansion pop. When it heats up and >then cools down I get a pop from inside the amp. It does this now >every time I make a SSB transmission. > >Anyone else experience this? If so, any resolution? > >Joe N9VX [snip] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
