Electro-Harmonix 12AX7 EH Preamp Vacuum Tube


The 12AX7EH provides high gain with ultra low noise and a detailed - musical tone that rivals the most desirable NOS types. Unique spiral filament eliminates that filament-to-cathode induced hum common on AC-powered amps. This tube can be used in phase inverters / preamp sections / driver sections - It really does well in all applications.

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Price is for a single tube with standard testing.

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    Given the low price of these tubes it's easy to overlook them. In my experience they are excellent performers. I've used them in two different audio systems with great results. They're on the warm side. They work very well in a application where the goal is a warm musical tone. I actually preferred them to a couple of NOS 12AX7 tubes. Don't be fooled by the low price. These are excellent tubes. Order the low noise/microphonics for the best result, and get them from Tube Depot.

    reviewed by: Gary