9 pin miniature preamp tube (Amplification Factor = 100). This Slovakian tube is full bodied and bright with lots of depth and color. It's like the 12AX7-S-JJ on steroids, keeping the definition and adding a lot of bite and brightness. In overdrive, it keeps its well defined bite and brings out the highs. For more information about our 12AX7 tubes, see our tech corner article on 12AX7s.

Electro-Harmonix 12AY7/6072

9 pin miniature preamp tube (Amplification Factor =100). This ubiquitous Chinese tube is straightforward and bright. Its high gain gives it some bite, too. In overdrive, it brings out the highs and offers easy access to harmonic sustain. For more information about our 12AX7 tubes, see our tech corner article on 12AX7s.

9 pin miniature preamp tube (Amplification Factor = 100). This is the ubiquitous Chinese 12AX7 with added selection. The gain is high and the American "Ruby Tubes" must be filtering out the noisiest ones. For more information about our 12AX7 tubes, see our tech corner article on 12AX7s.