Thing beside the tube

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audiophileboss

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on: September 14, 2013, 01:04:11 AM
There is something that looks like a knob beside the bigger(300b) tube. What is it?



Offline STURMJ

  • Sr. Member
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    • Posts: 279
Reply #1 on: September 14, 2013, 04:38:29 AM
Hum balance pot.