Electro-Harmonix 12AX7

Ultra-low noise thanks to unique spiral filament which eliminates cathode-to-filament induced hum on certain amps

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Ultra-low noise thanks to unique spiral filament which eliminates cathode-to-filament induced hum on certain amps
Best all-around choice and best value for 12AX7
ECC83/7025 equivalent
Many OEMs use relabeled Electro-Harmonix vacuum tubes in their amplifiers