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Single-ended Class A 300B tube power amplifier, output power: 9*2W, frequency response: 20Hz--30kHz, total gain: 39dB - AliExpress
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LOTFUN Hand-Made 300B Single-Ended Tube Amplifier 300b Speaker EF37 Boost 300B Beige Without Tubes Electronic Plug : Amazon.it: Elettronica
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