Upgraded 6k4 Tube Preamplifier Hifi Tube Preamp Auido Amp Home

1 Preamplifier. Stable product performance, upgraded for a variety of models of bile ducts. Left and right channel inputs are audio signal inputs, which can be connected to low-level signal inputs. The left and right channel outputs are audio signal outputs, which can be connected to the audio signal inputs of amplifiers or active speakers.