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Stereo Vacuum Tubes Psvane WR2A3 Valve tube WE300B/RCA 2A3 Hybrid&Improved amplifer DIY Heater Uf………………2.5V If…………… 2.5A Static Parameter Ua……………………250V -Ug………………… -45V Ia……………………60mA Gm……………………5.25 ...