You might remove one of the end bells and try inserting something between the bobbin and the laminations at the end. Maybe that is a mite loose.
Jim/W5JO > On Wed, Dec 23, 2009 at 10:39 AM, AirRadio <airra...@dsl.pipex.com> > wrote: >> I have a mains transformer in my latest boatanchor, it is rattling >> like mad, eventually goes away after an hour or so, I thought about >> dropping it in a can of varnish, anyone cured one before, any luck or >> waste of time? > > Sounds like it abates once things settle in thermally.The simple > approach I'd try first Max is to check the tension on any securing > bolts through the transformer laminations or chassis. Sometimes that > takes care of it. Other methods include removing the transformer and > re-sealing the laminations it in hot varnish, or isolating the > transformer from the chassis on rubber bushings. The latter is not a > good idea IMO due to safety concerns with internal shorts which would > otherwise become apparent when the case is grounded to the chassis. > > Gary WZ1M is a member of this list and has a transformer rebuilding > business, so he can certainly provide you with some pointers. I think > Don K4KYV and a few others have successfully dealt with similar > problems with success. It might be as simple as tossing he transformer > in the oven for a while on its own if tightening the bolts doesn't > cure it. > > ~ Todd, KA1KAQ/4 > Please help support this email list: http://www.qsl.net/donate.html > ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
