http://www.ozvalveamps.org/6bl8generic.html | Created: 24/12/10 | Last update:
The 6BL8 is a 9-pin small signal medium-mu triode and a sharp cutoff pentode originally designed for frequency changer and timebase of black and white TV's, it got used in a some amplifiers like the Playmaster 116/7 with the pentode as gain following the volume control and the triode as a split-load phase inverter.
Heater Voltage 6.3 V Heater Current 0.45 A Maximum Heater-Cathode Voltage Heater Positive with Respect to Cathode DC Component 100 V Heater Negative with Respect to Cathode DC Component 100 V Direct Interelectrode Capacitances (approx) Pentode Input 5.5 pf Output 3.8 pf Grid to Plate 0.025 pf Triode Input 2.5 pf Output 1.8 pf Grid to Plate 1.5 pf Maximum Ratings (Design Center Values) Pentode Plate Voltage 250 V Grid No. 2 Voltage 175 V Plate Dissipation 1.7 W Grid No. 2 Dissipation 0.5 W Cathode Current 14 mA Grid No. 1 Circuit Resistance Fixed Bias 0.5M ohm Self Bias 1M ohm Triode Plate Voltage 250 V Plate Dissipation 1.5 W Cathode Current 14 mA Grid No. 1 Circuit Resistance Fixed Bias 0.5M ohm Self Bias 0.5M ohm Characteristics and Typical Operation Triode Class A Amplifier Plate Voltage 100 V Grid No. 1 Voltage -2 V Amplification Factor 20 Transconductance 5000 µ Plate Current 14 mA Pentode Class A Amplifier Plate Voltage 170 V Grid No. 2 Voltage 170 V Grid No. 1 Voltage -2 V Plate Resistance (approx) 400K ohm Transconductance 6200 µ Plate Current 10 mA Grid No. 2 Current 2.8 mA
With thanks to NJ7P database.