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Title: Nobsound E6 Direct‑Heated Tube Preamp  
Category: Audio Equipment  
Brand: Nobsound  
Description: Compact Class A stereo pre‑amplifier using direct‑heated vacuum tubes for ultra‑low distortion and transparent sound.  
Details: Features 20 Hz–30 kHz response, 15.6 dB gain, 90 dB SNR, RCA input/output, powered via 5 V USB; includes 2J27S tubes in a metal case with a single knob

Price is $