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Electro-Harmonix 12AX7, Matched TrioThe 12AX7EH provides high gain with ultra low noise and detailed, musical tone that rivals the most desirable NOS types Unique spiral filament eliminates filament to cathode induced hum common on amps that use Ac on the filamentsFeatures of Electro-Harmonix 12AX7, Matched Trio Matched Trio Matched for both gain a..