Harold, I am not sure if that ferrite core will work in this application, nor can I say I have heard or seen such for an internal problem. With those older TR7's, the ferrite core solution sounds like a bandaid where surgery is required. If I had to venture a guess I would say it sounds more like a board seating issue to the mother board or a loose solder connection on one of the boards that creates the oscillation after the internal temperature rises and cause the boards to shift a little.
Ron / WB4HFN ----- Original Message ----- From: "hpolkscw" <[EMAIL PROTECTED]> To: [email protected] Sent: Thursday, December 4, 2008 10:02:58 AM GMT -05:00 US/Canada Eastern Subject: [Drakelist] TR7 audio oscillation I have a TR-7, serial, 45XX, that breaks into oscillation on both receive and transmit after some time warming up. However, it sometimes howls from startup. I remember reading some messages some time ago about a fix, which I think was a ferrite bead on a component leg. However, I cannot find this message after much searching, both on my computer and the archives. Can anyone point me in the direction of the message or provide the particulars of the modification. Thanks Harold N3HP _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
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