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KZ AS10 5BA Hifi Stereo In-Ear Earphone High Resolution Earbud Headphone with 0.
1Pc x Tube 6J1 Preamp Board Module Preamplifier Kit DIY. FE-6J1-2 tube fever plate pre-amp is the circuit schematic imitation design team Music fax X-10D to be rational optimization more stable performance than the original machine 10% tube set increase.