Willsenton R200 32W+32W Vacuum Tube Amplifier Bluetooth Vacuum Tube Amp (Black) w/ 5881 Vacuum Tubes. The R200 series utilizes four 5881 vacuum tubes for class AB1 push-pull power amplification, followed by one 12AX7 and two 6N1 tubes for signal amplification and driving, achieving an output power of 32W per channel.
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