KR Audio 5 - Low Frequency, low power triode. 2-5 Watts of pure class-A power. Maximum Plate Voltage 600 V Maximum Plate Current 50 mA Plate Dissipation 20 Watts Va 400 V Ia 50 mA Vg -10 V Transconductance 3 mA/V Amplification Factor 18 Filament Voltage 6.3 V (DC/AC) Filament Current 0.9 A SPECIAL ORDERED ITEM.THIS ITEM IS MADE TO ORDER.ALLOW 4 TO 6 WEEKS DELIVERY AFTER INITIAL ORDER.