Listen to Dave's excellent audio review of the Art Tube MP Preamp. These little devils have multiple versions ranging from $30 up to $100 + . They are not going to make or break your sound but they are an outstanding and cheap way to boost and nicely color your incoming signal.
You can pick them up at all the usual online retailers including AmazonArt Tube MP Studio at AmazonArt Tube MP Professional at Amazon
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