← BrowseData: HighHigh quality — base, heater, all universal parameters present, and ≥50% of desirable parameters filled in. Safe to use for design decisions.
Known Equivalents & Substitutes
No known equivalents. If you know of any, use the ⚑ Report Issue button above.
Similar Tubes (Not Drop-In Compatible)
6AX3
Sams lists as substitute — same Duodecar base family, verify pin compatibility and ratings before substitutingSame Duodecar 12-pin base and pinout but higher ratings (PIV 5000V vs 3300V, DC current 200mA vs 140mA, Pa 6.5W vs 4W) Same Duodecar base and active pin functions but higher heater current (1.8A vs 1.2A) and higher ratings (PIV 5000V, Ia 350mA) Electrical Specifications
Absolute Maximum
Anode Dissipation (max)Plate Dissipation (max)4W
Heater-to-Cathode Voltage (max)Heater-Cathode Voltage (max peak, heater negative)3,300V
Rectifier
Peak Inverse VoltagePeak Inverse Plate Voltage3,300V
Voltage Drop (typical)Tube Voltage Drop (at 250 mA DC)21V
Notes
- Base is Small-Button Duodecar 12-Pin (JEDEC E12-70), basing designation EIA 12BL. T-9 glass envelope.
- Socket terminals 5, 6, 8, and 9 should not be used as tie points.
- PIV rating of 3300V applies to operation in a 525-line, 30-frame TV system where the duty cycle of the voltage pulse does not exceed 15% of one horizontal scanning cycle.
- Voltage drop is 21V at 250 mA DC — relatively low for a damper diode, making it attractive for audio PSU use.
- Maximum heater-cathode voltage is very high: 3300V peak (heater negative) / 300V peak (heater positive), with DC component limits of 600V negative / 100V positive.
- Compactron series tube — General Electric created the Compactron format. Also produced by Sylvania and RCA.
Socket-Compatible Tubes ⚠ Not electrically compatible