I'm selling a vintage Barcus Berry 1330-1 Acoustic Preamp. This was designed to bring life into a stick on piezo transducer, but has uses beyond that. You can use it with any piezo output, but I was using it as a kazoo preamp. It is an amazing tool, and I wouldn't mind keeping it, but I'm not using it at the moment. I did do one mod to it, which is not only useful, but completely reversible. I used a battery clip to 2.1mm adapter to eliminate the need for a battery and allow you to power it on an external power source, like a Voodoo Labs or a One Spot. I removed a cover, which is inside on the battery clip, and put a rubber gasket to hold the adapter in place. I know, I'm a genius, right?
I'm asking $90 or best offer. I might listen to trade offers.