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M5 KT88 single-ended tube power amplifier, Output Power: 15w*2, Frequency response: 20H-35KHz, SNR: 89dB - AliExpress
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KT88 SE tube amplifier circuit, triode Ultra Linear switchable, 10 W by single ended circuit design - YouTube
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Amazon.com: Willsenton R8 KT88/EL34 x4 Tube Amplifier Integrated AMP Power Amplifier Headphone Replaceable Basic Meter (Black) : Electronics
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