Ampeg B-25B

Hello, Looking to trade an Ampeg B-25B head and matching 2x15 cabinet for an electric upright bass, 6-string bass, or possibly something else bass-related. The amp is in good shape. Previous owner re-tubed it (I have the old tubes). The head is 50 watts of tube goodness. It is much lighter than an SVT. The cabinet is 16 ohms but switchable via a switch on back of cabinet to 8 ohms for use with other heads. I have seen videos and have read online that B-25s can be used with an 8 ohm cabinet if a dummy speaker jack is inserted into the extension cabinet jack on the back of the head. I have not tried this as the amp sounds great with original cabinet. There is some scratchiness in the channel one volume pot. Happy to answer any questions. Thanks