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Before you believe what the tester is telling you, hook a DVM to the heaters as you are doing the testing, to be sure that the heater voltage is not dropping below 6.3 VAC, that's the problem my tester has, b&k model 490b, it does NOT have the power to light up a color roundie, and drops below 5 VAC, I have to rig up a separate 3 amp 6.3 VAC source to test them correctly.
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