Hohner B2a

[Rayman]

I picked this very sorry B2a up. Filthy dirty, really horrible it was (it’s clean now).

 

It’s missing its jack assembly. I assume that a telecaster style jack plate will work, but the suggested barrel jack absolutely does not fit in there. So I ordered a regular style stereo jack, which I hope will work.

 

Question is, I have two loose wires, blue and white. I assume that there should be 3 for a stereo jack? Anyone have one of these that can be bothered to open it up and take a couple of pics for me?

 

 

 

👍🏻

Edited Saturday at 09:01 by Rayman

[Rayman]

There’s also a loose red wire in here…. which I assume goes against the live contact where the circuit board slots in? It is definitely meant to be loose, it hasn’t come off anything. It only popped up when I pulled out the circuit board/trim pot insert to clean it 

 

[Reggaebass]

Hi Rayman, mine is next to me, give me a few minutes and I’ll look 

[Reggaebass]

Any help 

[Rayman]

Thanks for that. Different layout unfortunately, but thanks anyway 👍🏻

[Reggaebass]

1 minute ago, Rayman said:

Thanks for that. Different layout unfortunately, but thanks anyway 👍🏻

I don’t know anything about electrical stuff but yeah looks different, good luck 

[tauzero]

My B2AV has (or had, before I replaced the dead preamp) the same layout as Reggaebass's. Doing a search, @casapete and @simon1964 both had XLR output B2As in 2013, one or both might still have them.

[casapete]

51 minutes ago, tauzero said:

My B2AV has (or had, before I replaced the dead preamp) the same layout as Reggaebass's. Doing a search, @casapete and @simon1964 both had XLR output B2As in 2013, one or both might still have them.

Unfortunately my B2A is long gone, sorry!

[Rayman]

Yeah there’s surprisingly little on the net to help…. I’m sure I’ll figure it out.

 

 Thanks anyway 👍🏻

[Hellzero]

Check here for the wiring of the preamp inside the battery compartment: https://my.hohner.de/t/hohner-b2a-spare-parts/1060

 

And here some photos of the XLR preamp wiring:

 

 

Edited Saturday at 13:37 by Hellzero

[SpondonBassed]

Mine...

 

 

 

 

 

I hope this helps.

 

It looks like the shielding on your white core wire needs to be exposed a bit more.  That'll be your third wire.

 

@Andyjr1515 replaced the jack socket for me some time back.  I didn't want to put a strain on the preamp harness and end up like you seem to have but the order of the wire colours is just visible.

 

 

 

 

 

 

 

 

Edited Saturday at 14:18 by SpondonBassed

[Hellzero]

And here is the preamp diagram/wiring:

 

[Rayman]

Awesome, thanks so much 

[SpondonBassed]

3 hours ago, Rayman said:

Awesome, thanks so much 

 

You're welcome.  Glad to be of help.

[simon1964]

On 12/07/2025 at 12:19, tauzero said:

My B2AV has (or had, before I replaced the dead preamp) the same layout as Reggaebass's. Doing a search, @casapete and @simon1964 both had XLR output B2As in 2013, one or both might still have them.

One of my sons "borrowed" my B2A some years ago, so I don't have access to it just now (it does have the XLR output). Hopefully the wiring diagram further up the thread helps - if not, let me know and I will ask him to send me a photo of the wiring.

Edited 5 hours ago by simon1964