Mine is rather noisy. At 40 cms it increases the room noise by 4-5 dBs. > Il giorno 19 ott 2024, alle ore 15:18, Leo Reynolds via R-390 > <[email protected]> ha scritto: > > Is it normal for a R-390A power transformer to hum audibly? Not through the > speaker, though there is a little there too, but through slight chassis > vibration. It is there from the instant of turning on power and changes > slightly as the rectifier starts conducting and B+ flows. It is easily > audible in the shack, as if it were a small AM broadcast transmitter minus > the blower. > > Thanks, > > Leo Reynolds > K4LDR > > > > ______________________________________________________________ > R-390 mailing list > Home: http://mailman.qth.net/mailman/listinfo/r-390 > 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
______________________________________________________________ R-390 mailing list Home: http://mailman.qth.net/mailman/listinfo/r-390 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
