{"type_number":"6DE4","canonical_url":"https://tubeofile.com/tubes/6DE4","manufacturer":"General Electric","tube_type_key":"diode","tube_type_display_name":"Diode","base_name":"Octal","description":"Single indirectly-heated diode designed for use as the damping diode in horizontal-deflection circuits of television receivers. Coated unipotential cathode type with 5-pin short intermediate-shell Octal (B5-85) base.","is_directly_heated":false,"completeness":"high","notes":["PIV rating of 5000V applies for operation in a 525-line, 30-frame television system per FCC standards; duty cycle of the voltage pulse must not exceed 15% of one scanning cycle.","Heater positive with respect to cathode: DC component max 100V, total DC and peak max 300V. Heater negative with respect to cathode: DC component max 900V, total DC and peak max 5000V.","Socket terminals 1, 2, 4, and 6 should not be used. Pin 2 is an internal connection — do not use as a tie point.","Radiomuseum.org lists 6CQ4 as identical to the 6DE4; this has not been independently verified from manufacturer datasheets.","Interelectrode capacitances (without shield): cathode-to-plate-and-heater 11.5 pF, plate-to-cathode-and-heater 8.5 pF, heater-to-cathode 4.0 pF."],"references":["https://tube-data.com/sheets/093/6/6DE4.pdf"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=6DE4","radiomuseum":"https://www.radiomuseum.org/tubes/tube_6de4.html"},"raw_equivalents":[],"equivalents":[],"similar":[{"type_number":"17DE4","reason":"Identical except 16.8V heater — not a drop-in replacement in TV series heater string circuits","has_detail_page":false},{"type_number":"22DE4","reason":"Identical except 22.4V heater — not a drop-in replacement in TV series heater string circuits","has_detail_page":true},{"type_number":"6DA4","reason":"Same 6.3V heater Octal damper diode family but lower PIV (4400V vs 5000V) and lower current ratings","has_detail_page":true}],"pins":[{"pin_number":"2","function":"Internal Connection — Do Not Use","function_code":"ic","notes":null},{"pin_number":"3","function":"Cathode","function_code":"k","notes":null},{"pin_number":"5","function":"Plate (Anode)","function_code":"a","notes":null},{"pin_number":"7","function":"Heater","function_code":"h","notes":null},{"pin_number":"8","function":"Heater","function_code":"h","notes":null}],"specs":[{"key":"Vh","display_name":"Heater Voltage","value":"6.3","numeric_value":"6.3","unit":"V","param_group":"heater"},{"key":"Ah","display_name":"Heater Current","value":"1.6","numeric_value":"1.6","unit":"A","param_group":"heater"}],"sections":[{"section_number":1,"section_label":"Diode","tube_type_key":"diode","specs":[{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"6.5","numeric_value":"6.5","unit":"W","param_group":"absolute_max"},{"key":"Vhk_max","display_name":"Heater-to-Cathode Voltage (max)","value":"5000","numeric_value":"5000","unit":"V","param_group":"absolute_max"},{"key":"PIV","display_name":"Peak Inverse Voltage","value":"5000","numeric_value":"5000","unit":"V","param_group":"rectifier"},{"key":"Vdrop","display_name":"Voltage Drop (typical)","value":"32","numeric_value":"32","unit":"V","param_group":"rectifier"},{"key":"Idc_max","display_name":"Max DC Output Current (total, not per-anode)","value":"175","numeric_value":"175","unit":"mA","param_group":"rectifier"},{"key":"Ia_peak","display_name":"Peak Anode Current (surge)","value":"1100","numeric_value":"1100","unit":"mA","param_group":"rectifier"}]}],"synced_at":"2026-04-08T07:52:33.903Z"}