B2A preamp system

Hello everyone,
I hope someone can help me whit this. I have a bass that has a B2A preamp system and due to age it is failing. I wonder if Hohner makes this type of preamp for sell? I saw a post here about the battery compartment being brittle it happened to me too but now the whole preamp is not working properly!

Please please help me.
Thank you.

Santiiago

Hi bassman depending how good you are with electronics you can
buy parts to put together including plastic box,battery connection from china so cheap to do. I put wiring diagram for bass but active
circuit not shown have you seen small vox amp plug in the jack may
just boost volume not the tone also check the pots.

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