about the tube.please do not deep plug it in socket.just plug it in half deep is OK.because the tube easy crush
Features: 1,PCB Circuit layout is reasonable and beautiful, minimize noise,warm sound,perfact for listen person singing.
2,About the input and output interface.all using GOLD RCA interface.
3,Best for your desktop headphone amplifier or home power amplifier, make the sound more warm. (This tube preamp need warm time about 5-10 minutes.)
CD/MP3 player—>6J1 preamp—>Power amplifier—>speaker
Interface:Gold RCA*2(input and output)
Volume knob with volume and Turn ON/OFF function
1 x HiFi