{"type_number":"12SN7WGT","canonical_url":"https://tubeofile.com/tubes/12SN7WGT","manufacturer":null,"tube_type_key":"small_signal_triode","tube_type_display_name":"Small Signal Triode","base_name":"Octal","description":"Medium-mu dual triode; indirect heated octal tube. 12.6V heater version of the 6SN7WGT, designed for series-string heater circuits. Electrically identical to the 6SN7GT with same Octal base — a drop-in replacement with series heater wiring. The 'W' suffix indicates ruggedised construction for military/industrial use.","is_directly_heated":false,"completeness":"high","notes":["12.6V heater version of the 6SN7WGT. Heater current is 0.3A at 12.6V (vs 0.6A at 6.3V). Same Octal base and pinout — a drop-in replacement when used with series heater wiring.","The 'W' designation indicates ruggedised construction meeting military specifications for vibration and shock resistance.","Brans Vademecum groups the 12SN7WGT with a large equivalence family including 12SX7GT, 13D1, 14N7, 6CG7, 6FQ7, 6SN7WGT(A), 7N7, 8CG7, 8FQ7, and others.","Raytheon data for 12SN7GT confirms: 12.6V/0.3A heater, mu=20, gm=2600 umhos, ra=8500 ohms at Va=250V, Vg=-8V.","Electrically identical to the 6SN7GT — same section specs, same operating conditions. The only difference is the heater voltage/current ratio."],"references":["https://frank.pocnet.net/sheets/127/6/6SN7GT.pdf"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=12SN7GT","radiomuseum":"https://www.radiomuseum.org/tubes/tube_12sn7wgt.html"},"raw_equivalents":["12SN7GT","12SN7GTA","12SX7GT"],"equivalents":[],"similar":[{"type_number":"6CG7","reason":"Same electricals (mu=20, gm=2.6 mA/V, ra=7700 ohms) but Noval base and 6.3V heater — not pin-compatible","has_detail_page":true},{"type_number":"6SN7GT","reason":"Electrically identical, same Octal base and pinout, but 6.3V/0.6A heater — drop-in if heater supply is adapted","has_detail_page":false},{"type_number":"6SN7WGT","reason":"Electrically identical ruggedised version but 6.3V/0.6A heater — drop-in if heater supply is adapted","has_detail_page":false},{"type_number":"7N7","reason":"Same electricals but Loctal base — not pin-compatible with Octal","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Control Grid (section 2)","function_code":"g1_2","notes":null},{"pin_number":"2","function":"Anode (section 2)","function_code":"a2","notes":null},{"pin_number":"3","function":"Cathode (section 2)","function_code":"k2","notes":null},{"pin_number":"4","function":"Control Grid (section 1)","function_code":"g1_1","notes":null},{"pin_number":"5","function":"Anode (section 1)","function_code":"a1","notes":null},{"pin_number":"6","function":"Cathode (section 1)","function_code":"k1","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":"12.6","numeric_value":"12.6","unit":"V","param_group":"heater"},{"key":"Ah","display_name":"Heater Current","value":"0.3","numeric_value":"0.3","unit":"A","param_group":"heater"}],"sections":[{"section_number":1,"section_label":"Triode (each section)","tube_type_key":"small_signal_triode","specs":[{"key":"Va_max","display_name":"Anode Voltage (max)","value":"450","numeric_value":"450","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"5","numeric_value":"5","unit":"W","param_group":"absolute_max"},{"key":"Ik_max","display_name":"Cathode Current (max)","value":"20","numeric_value":"20","unit":"mA","param_group":"absolute_max"},{"key":"Vhk_max","display_name":"Heater-to-Cathode Voltage (max)","value":"200","numeric_value":"200","unit":"V","param_group":"absolute_max"},{"key":"Va","display_name":"Anode Voltage (typical)","value":"250","numeric_value":"250","unit":"V","param_group":"typical_operating"},{"key":"Vg","display_name":"Grid 1 Bias Voltage","value":"-8","numeric_value":"-8","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"9","numeric_value":"9","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"7700","numeric_value":"7700","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"2.6","numeric_value":"2.6","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"20","numeric_value":"20","unit":"—","param_group":"typical_operating"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"3.8","numeric_value":"3.8","unit":"pF","param_group":"capacitances"},{"key":"Cgk","display_name":"Grid-to-Cathode Capacitance","value":"2.6","numeric_value":"2.6","unit":"pF","param_group":"capacitances"},{"key":"Cak","display_name":"Anode-to-Cathode Capacitance","value":"0.7","numeric_value":"0.7","unit":"pF","param_group":"capacitances"}]}],"synced_at":"2026-04-07T12:05:43.762Z"}