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12AX7
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==Gallery== <gallery> File:Electro-harmonix 12AX7EH.JPG|Electro-Harmonix 12AX7EH File:ECC83 var.jpg|Various brands of 12AX7, with measuring tape to indicate size File:Dubulttriode darbiibaa.jpg|Tungsram ECC83 during operation File:Philips 12AX7WA tube.jpg|Philips JAN 12AX7WA (Joint Army Navy) </gallery>
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