BadAax T11A Mods

BadAax T11-A tube microphone

The BadAax T11-A is a dirt-cheap version of the Alctron T11-A, better known as the Apex 460. It is one of the best tube mic mod platforms on the market. We have multiple mod options for this mic, enabling you to turn your T11-A into a virtual clone of the AKG C12 (or ElaM 251).

#1: Capsule Replacement

RK-12 capsule

The T11-A's capsule is a common 32mm K67 type, found in nearly every inexpensive large-diaphragm condenser ever made. It is not a great-sounding capsule, due to its uncorrected high-frequency peak. And it's the wrong capsule for this circuit, in any case.

Our favorite (and best-selling) capsule for T11A mods is the RK-12, which is our version of the capsule in the famous C12 and ElaM 251. The RK-47 is another perfectly viable choice, if you're going for a U47 vibe.

See all of our large-diaphragm microphone capsules.

#2: Grille / Headbasket Replacement

C12 Grille for Apex 460

Our C12-style grille for the BadAax T11-A provides an easy cosmetic and sonic upgrade. The chrome grille not only looks sharp, but is more acoustically transparent than the stock grille, giving the mic a more open sound.

Click for more info on our C12-style grille for the BadAax T11-A.

#3: Fox 460 Circuit Mod Kit for Alctron / BadAax T11-A

Fox 460 Mod Kit

The Fox 460 circuit mod kit is a comprehensive upgrade for the T11-A. It replaces both circuit boards, 100% of the components in the microphone, and the transformer. It contains a critical mod to the power supply, as well.

One thing to beware of when researching mods for this mic is that much of the information available online is contradictory. You'll see advice to change the tube and/or the transformer and/or selected capacitors, for example. Some of those things might help your mic, but none of them will come anywhere close to the sonic upgrade of a comprehensive circuit mod such as the Fox 460 kit.

Why? Because only by optimizing the circuit for a specific tube and transformer can the mic's performance be maximized. If you upgrade components piecemeal, you might end up with lower output and higher distortion than in the stock mic. In fact, one popular mod we've seen recommends using a 12:1 transformer, which will drop the mic's output by 3dB while keeping the noise floor the same. That's not a mod you'll appreciate, especially considering the $129 price tag on that transformer!

In contrast to online advice, our Fox 460 upgrade gives you a field-proven circuit that delivers impressive performance specifications -- e.g. lower than 1% distortion even at an aggressive 115dB input signal. See lab test results on the product page.