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Similar Tubes (Not Drop-In Compatible)
5U4GB
Similar DC output class (250 mA) but directly-heated 5 V/3 A filament and completely different pinout — not a drop-in
6AX5-GT
Same base family (Octal, 6.3 V, indirectly heated) and similar intent but lower ratings (125 mA vs 250 mA) and higher Vdrop (50 V vs 21 V); different pin layout — not a drop-in
Electrical Specifications
Absolute Maximum
Anode Voltage (max)AC Voltage per Plate (max RMS)350V
Heater-to-Cathode Voltage (max)Heater-to-Cathode Voltage (max, heater negative)450V
Rectifier
Peak Inverse VoltagePeak Inverse Plate Voltage (Rectifier Service)1,250V
Voltage Drop (typical)Tube Voltage Drop (at 250 mA each plate)21
Notes
JEDEC base 7Q — medium-shell 7-pin Octal (one Octal pin is unused). Uses the standard Octal socket.
Primary design intent is TV damper service in horizontal-deflection circuits — hence the high peak-inverse rating in damper service (2000 V) vs normal rectifier service (1250 V), and the tolerance for the high pulse currents a damper diode sees.
Vhk is asymmetric: 450 V max heater-negative but only 100 V max heater-positive. Pay attention to phasing of the heater winding relative to B+ in conventional rectifier service.
Low Vdrop (21 V at the full 250 mA per plate) combined with 250 mA DC output makes this one of the most useful 6.3 V rectifiers for higher-current receivers and small amplifiers — roughly double the output of a 6X5 or 6AX5.
'50AX6G' variant is the same tube with a 50 V heater (series-string radios) — electrically equivalent once heater is satisfied but obviously not a drop-in for 6.3 V sockets.