MARK III PREAMP TUBE TESTING

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Joined
Dec 8, 2014
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Guys Need help checking preamp tubes on Mark III , Should I try this test on V1 using a pencil hitting the tube gently, and should V1 be dead silent when tapping the tube being tested using clean Channel on max volume? Or I ll hear the tapping in the speaker?

Any other suggestions to perform this test?
 
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