Nobsound 6J1 Valve Vacuum Tube Pre-AMP Preamplifier Hifi Stereo Audio Assembled Board Go to amazon.com Related posts Best musical fidelity 6j1 Featurebased on MUSICAL FIDELITY circuit,Sounds is amazing!This board comes with a boostSize: 170 60 mmJust plug in the transformer and then worksPower supply:AC 12V 500mA