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  #1  
Old 02-07-2020, 08:02 AM
iong iong is offline
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Zenith 25mc33 Hot Fly

My flyback on Zenith 25mc33 gets too hot after 2 hours. You can smell the wax. Horz output cathode current is good. Changed HV. Reg. and crt bias is not high. Don't know what's wrong. Is this a shorted fly?
Thank you,
Perry
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  #2  
Old 02-07-2020, 08:51 AM
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zeno zeno is offline
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Every shorted FBT I remember gave no raster. If it were the FBT
it should show high cathode current since the H. out would be
running into a non resonate circuit. Best test is to totally unhook it
& ring it with an analyst. A PIA to do !
Just how hot does it get ? Can you hold it, does it get squishy ?
Maybe it just smells old ?

73 Zeno
LFOD !
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  #3  
Old 02-07-2020, 08:58 AM
iong iong is offline
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You can't hold it after two hours and the wax is soft. Going to try a different 3AT2 Rect today.
Thank you,
Perry
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  #4  
Old 02-07-2020, 09:27 AM
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Electronic M Electronic M is offline
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See my post in your Lin coil thread.
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  #5  
Old 02-07-2020, 02:53 PM
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oldtvman oldtvman is offline
Larry Melton (oldtvman)
 
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I have one extra NOS flyback for my 25mc33, as you well know these are impossible to come by. I'd sell it for 199.00
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  #6  
Old 02-07-2020, 04:43 PM
iong iong is offline
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Thank you but I already have an extra fly. This TV was repaired for a friend. My 25MC33 has a working Horz. Eff. coil but the plastic is broken where it presses into the chassis and is taped up and tucked inside. If you have an extra I could use one.
Thank you,
Perry
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