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EMG 12B Stereo Output Jack
The EMG 12B is a Neutrik stereo output jack that EMG offers as a replacement part for guitars and basses with active pickups or passive pickups with an active EQ. In an active circuit this is the jack that switches the battery on when a cable is plugged in. It is worth keeping on hand when a loose or worn jack needs replacing, or when converting an instrument to active electronics. Open-frame metal construction with a threaded bushing and solder lugs.
🏆 SoundsGood — official EMG dealer in Ukraine: genuine gear only, with full warranty and service support.
The Jack That Controls the Power
A stereo jack has an extra contact: as soon as you plug in, it closes the battery circuit, and when you unplug, it opens it. In EMG's words, the stereo output jack acts as an on/off switch, so it pays to unplug after playing. Do that and, according to EMG, a single 9V battery lasts on average around 1,000 playing hours for a set of EMG pickups.
A Genuine EMG Part
A regular mono jack in an active guitar will either fail to power the preamp or leave the battery permanently connected. The 12B is EMG's own replacement part, intended specifically for active systems, so there is no guesswork about compatibility.
Guitar or Bass Alike
The jack suits both guitar and bass: with active pickups (EMG or others) or with passive pickups and an active EQ or preamp. The standard 1/4" (6.35 mm) size takes any ordinary instrument cable.
Specifications
| Type | Stereo Output Jack |
| Model | EMG 12B |
| Jack Manufacturer | Neutrik |
| Size | 1/4" (6.35 mm) |
| Application | Guitars and basses with active pickups or passive pickups with an active EQ |
| Function in an Active Circuit | Switches the battery on when a cable is plugged in |
| Included | EMG 12B stereo output jack |
| Warranty | 12 months (electronic and mechanical components) |
What's Included
The package contains one EMG 12B stereo output jack (Neutrik).
Who It's For
The EMG 12B is for the active guitar or bass owner whose output jack has worked loose or started crackling, the player converting an instrument from passive to active pickups or adding a preamp, and the tech who wants a genuine EMG spare on the bench.
Frequently Asked Questions
Why does an active guitar need a stereo jack?
The extra contact of a stereo jack switches the battery on when a cable is plugged in and off when it is removed. That way the active electronics do not drain the battery while the instrument is unplugged.
Can I use the 12B in a guitar with passive pickups?
EMG positions the 12B for instruments with active pickups or passive pickups with an active EQ — circuits that have a battery. A fully passive guitar does not need the power-switching function.
Why does my battery die when the guitar is just sitting there?
Most often because a cable was left in the jack: according to EMG, the stereo jack acts as a switch, and while a plug is inserted the preamp stays powered. Unplug after playing and a 9V battery lasts on average around 1,000 playing hours.
How does the 12B differ from a regular mono jack?
A mono jack only has signal and ground contacts, so it cannot switch a battery. The 12B is a stereo jack with an extra contact, intended by EMG specifically for active systems.
What cable do I need?
A regular instrument cable with a 1/4" (6.35 mm) plug — no stereo cable is required.
Is this a genuine EMG product, and what is the warranty?
Yes. SoundsGood is an official EMG dealer in Ukraine; the warranty is 12 months on electronic and mechanical components.
🚚 Shipping and Payment
🏆 SoundsGood — full warranty and service support
✅ Quality guarantee — genuine instruments only
🏪 Pickup — Kyiv, free
🚚 Nova Poshta / Ukrposhta / Meest — 1–3 days
💳 Installments — PrivatBank, Monobank
🎸 Order the EMG 12B stereo output jack at SoundsGood! ⚡