Mullard CV4004 / 12AX7 New Production Preamp Vacuum Tube
The new production Mullard CV4004 / 12AX7 is a high gain, low noise 12AX7 variant with a short plate structure for reduced microphonics excellent for use in high gain Marshall pre-amplifier circuits or any combo amp where noise and microphonics can be a problem.
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I have tried this Mullard as well as the NOS CV4004. These tubes are more laid back than the Electro Harmonix. I prefer the sound of the Tung Sol because they are more vivid and have less detail retrieval in the treble region. But many people do favor these tubes.
reviewed by: Michael Emery
Tube neophyte, so reader beware. I recently entered the world of tubes with a Yaqin MS-12B preamp for my Rega P2 stock TT. After spending 20 hours listening to the stock Chinese tubes, I put the Mullards Ax7 and Au7’s in. The sound improvement was very noticeable. The mullards offerred a much more detailed sound. Crimson & Clover sounded flat until I put in the mullards to fully appreciate the song on my modest system.
reviewed by: 11g
This is my favorite new production tube! I’m running this in my Silverface Champ and it’s the closest to the JAN tube that was in it when I bought it.
reviewed by: Nick
I used these in a JTM45 in V1 and V2, very nice sounding pre amp tubes, lots of growl.
reviewed by: Rocky Singleton