Mulard 12AX7 ECC83 Review

Review – Mullard 12AX7 / ECC83 Reissue Tube

4:05 pm

The Mullard 12AX7 / ECC83 Reissue is a nice tube but in my opinion better suited to home audio than guitar amps. The tubes have well balanced triode pairs and a very even flat response. Compared to a Tung Sol it sounds a bit flat, but so does a NOS Mullard. Microphonics is not an issue despite the larger that average plate structure. The transconductance on my sample was the same as two NOS samples I measured. Not really high gain at all, but a real good noise floor and a nice smooth tone that doesn’t encourage ear fatigue the way some preamps can be.

The Tung-Sol 12AX7 is my favorite preamp for guitars because it accentuates highs and lows. The Mullard 12AX7 adds virtually no tone coloring and is smoother sounding to my ear than a JJ ECC83S. For hi-fi gear the Mullard will likely be a winner but there are better choices for guitar amps for less money.

2 Responses

  1. Philippe
    Philippe at |

    Thanks for this article.

  2. Gregg Kervill
    Gregg Kervill at |

    Many thanks you your analysis John. Most of my 30 years R&D was with transistors, but I do know the difference between a KT88 and a KT44! Memories of someone in a local shop being sold a KT88 to replace a dead KT44 – yes really – I don’t know what would be worse – the lope-sided response or the dc component through the output transformer.

    These days I’m using retirement to complete some books and other projects – I know that one day I’ll drop my TUBE MP and so upgrading the tube and keeping the original as a spare would be good insurance. A new tube should last to the end of my days.

    And thanks for the link – I’ll ask “She who must be obeyed” to order one. gk


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