Electro-Harmonix 12AX7EH Preamp Tube

High gain preamplifier tube with ultra low noise and detailed, musical tone. Unique spiral filament eliminates filament to cathode induced hum common on amplifiers that use AC on the filaments.

Its detailed, musical tone rivals the most desirable NOS types Unique spiral filament eliminates the filament-to-cathode-induced hum common on amps that use AC on the filaments