The Ei ECC83 / 12AX7 is modeled after the famous "flat plate" Telefunken pre-amp audio tube. Although no longer in current production, the Ei 12AX7 / ECC83 tube is in stock now. This batch was originally intended for OEM so the bottles are not labeled with the "Ei" brand. The Ei 12AX7 tube is best suited for professional and home audio applications. The exception is guitar amps; although the tone is great, we will not guarantee microphonic performance in those types of amps and would strongly suggest that you try another 12AX7 type. There is no warranty when used in guitar amps. From our review of this tube: "...they are very musical sounding with lots of gain and a very low noise floor. When playing the guitar you could really get the benefit of their dynamic range. They can reproduce soft passages accentuated with a sharp punch and you don't have to go near the volume controls." Note to audiophiles: these tubes cannot be used with California Audio Labs products. 
Other Ei tubes
 12AX7 TypesClick image to enlarge Availability: Out of stock. |
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