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Dueling Heathkits
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12-29-2016, 12:32 PM
jr_tech
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Join Date: Sep 2009
Posts: 4,520
Possibly open filament... if you don't have a tube checker, check the filament resistance between pin 2 and pin 7, it should be around 2 ohms or less. I just measured one at 1.78 ohms.
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