KR Audio 2A3 - Low Frequency, low power triode. 2-5 Watts of pure class-A power. Maximum Plate Voltage 300 V Maximum Plate Current 100 mA Plate Dissipation 20 Watts Va 250 V Ia 70 mA Vg -45 V Transconductance 5.2 mA/V Amplification Factor 3.8 Filament Voltage 2.5 V (DC/AC) Filament Current 2.5 A SPECIAL ORDERED ITEM.THIS ITEM IS MADE TO ORDER.ALLOW 4 TO 6 WEEKS DELIVERY AFTER INITIAL ORDER.