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Entry level SOHA kit
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This is the entry level SOHA kit with all the parts needed to Build the headphone amplifier board including transformer, caps resistors and PC board.
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Level 1 SOHA kit
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This is the entry level SOHA kit with all the parts needed to Build the headphone amplifier including Alps pot and transformer, enclosure, caps resistors and PC board
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Level 2 SOHA kit
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This is an upgraded SOHA kit with all the parts needed to Build the headphone amplifier including Alps pot and transformer, enclosure, caps resistors and PC board