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#1
06-02-2007, 09:33 PM
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Admiral vertical and horizontal nutso
My Admiral set (model C2256 N) that I watch frequently went nuts tonite. ( its the one in my avatar) I turned it on and vertical and horizontal were both out of sync. Picture is not dim, audio is fine. I have read about high voltage reduction and such but an old tv repair book I have refers to a clipper. You think I am on the right track?
Dan 
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#2
06-02-2007, 10:14 PM
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Does the tube chart show a Sync Separator tube?
That might be a good place to start, try wiggling around first to make sure it's seated (unplug set!)
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#3
06-03-2007, 01:48 PM
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Eric, tube chart shows sync sep & vert osc. tube V401 which is a 12AU7 tube. Did a continuity check on with 4,5, and 9 pins all check good on continuity.
Dan
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#4
06-03-2007, 02:05 PM
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Now, discovered sync disc tube v403 which is a 6AL5 tube to have continuity in pins 3 & 4. Tube was still cold after a test of tv. Hope that is it.
Dan
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#5
06-07-2007, 04:53 PM
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Tubes came via UPS today. I ordered 3 tubes that I suspected could be faulty. The one and only I did not check, cause it was a real pain to reach was the culprit. 3rd IF & SYNC. INV tube 6U8 was the bad one. Tested bad too once I took it out. Set works great now! My first actual tv repair,, gotta start somewhere. But I have a question, why does that tube have a metal shroud around it?
Dan
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#6
06-07-2007, 11:58 PM
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it has a shield to prevent detuning to surrounding electromagnetic interference.
plain and simple it keeps things stable by preventing the tube from picking up unwanted noise. Glad you found the problem.
__________________
Jordan
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