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TL-922 is buzzing but works perfectly	Reply
by HA5BZR on October 26, 2009	Mail this to a friend!
Dear Friends! I have TL-922,my linear is buzzing but only in SSB MODE,in CW MODE is ok.I checked the screws on the transformer,it is ok. The buzzing noise comes from left side of amplifier,in STBY (when no drive) is also buzzing,but linear works perfectly. My questions: 1.How can I test that my filament transformer causes the buzzing or other things? Is it good solution if I solder down the 2 yellow wires which go from filament transformer 11V output to the tubes? Because after soldering the filament transformer output will be free,no 14A current and without this big 14A maybe the transformer will no buzzing,I could decide this transformer causes the buzzing noise.If the buzzing don t stop,something else cause the buzzing,not the transformer,is itv 2.What will happen with the tubes if the tube don get 11V heater voltage and linear is POWER on?Can I damage the tube or not?Because anod Voltage is on the tube,but without 11V heating voltage?Is it problem for the 3-500Z tube? 3.Do you have a better or other idea? Thanks:Laszlo HA5BZR

RE: TL-922 is buzzing but works perfectly	Reply
by K4DPK on October 26, 2009	Mail this to a friend!
Laszlo Just pull out one of the tubes. They are in series, so that will remove the load from the filament transformer. Be careful when you start to plug it back in, and remember to drain the high voltage. Phil C. Sr. k4dpk

RE: TL-922 is buzzing but works perfectly	Reply
by HA5BZR on October 26, 2009	Mail this to a friend!
Dear K4DPK! Thanks the answer! I removed the 2 tubes but it is the same buzzing noise coming from left side of the linear. Is it possible that filament transformer is buzzing without tubes? What about if I don t give 220V primer voltage for the filament transformer? If I hear also buzzing ,I will know that it is not the filament transformer,other thing is buzzing. Is it good idea? Thanks:Laszlo

RE: TL-922 is buzzing but works perfectly	Reply
by K4DPK on October 26, 2009	Mail this to a friend!
Yes, that is what you should do next. Phil C. Sr. k4dpk

RE: TL-922 is buzzing but works perfectly	Reply
by KE3WD on October 27, 2009	Mail this to a friend!
A transformer that is delaminating can buzz because the plates of the core have become loose. Sometimes simply tightening the bolts at the four corners of the transformer can eliminate the delamination buzz. Other times it may take some resealing, which ideally should be done at a transformer shop but can be done by the do-it-yourselfer as well. First try that disconnection of transformer primary to see if it really is the transformer, of course.

RE: TL-922 is buzzing but works perfectly	Reply
by K1DA on November 3, 2009	Mail this to a friend!
I've had one for 20 years and it has always buzzed a little bit on voice peaks on the SSB high voltage position. No noise on CW or using it on SSB with the CW tap.

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