Thread: B&K 667 issue
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Old 06-05-2018, 06:29 AM
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timmy timmy is offline
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Join Date: Jan 2011
Location: ferndale ny
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12au7 heater is 12 volts so it shouldn't be to difficult to figure out the heater connections. Lookup the tube where the heater connections are then check how much voltage the tester is putting out. Seems like only one side of the tube heater is working, make sure both sides of the tube is wired for the 12 volts.
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