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Old 28th August 2011, 11:52 PM   #31
timwebb is offline timwebb  United States
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0.5 ohms
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Old 29th August 2011, 12:00 AM   #32
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The transformer appears to be shorted. Do you see any windings that appear to be darkened?

If not, try twisting the transformer while measuring the resistance. Does the resistance ever go significantly higher?
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Old 29th August 2011, 12:06 AM   #33
timwebb is offline timwebb  United States
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yes it does the resistance goes very high.
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Old 29th August 2011, 12:11 AM   #34
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You'll need to find the short. Do you have a current limiting resistor?
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Old 29th August 2011, 12:17 AM   #35
timwebb is offline timwebb  United States
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yes.
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Old 29th August 2011, 12:27 AM   #36
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Insert the resistor between the B+ line and the amp's B+ terminal. Connect the ground from the power supply to the secondary center tap. Make no other connections to the amp. Apply power and twist the transformer. You should hear it arc and you should see a spark where the short is. You'll need to insulate it at that point.
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Old 29th August 2011, 12:30 AM   #37
timwebb is offline timwebb  United States
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doing it now.
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