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[Yamamaya42]

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.

[timmy]

Originally Posted by Yamamaya42

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.

These 440 testers I have had for awhile now and all my other tubes in my sets tested good the heaters lit good only this one tube so I don’t think it would be the power that supply’s the heaters. The 440 testers on color is 7 vac