{"type_number":"12CG7","canonical_url":"https://tubeofile.com/tubes/12CG7","manufacturer":null,"tube_type_key":"small_signal_triode","tube_type_display_name":"Small Signal Triode","base_name":"Noval","description":"General-purpose medium-mu twin triode in 9-pin miniature (Noval) construction. 12.6V heater version of the 6CG7/6FQ7, designed for use in series-string heater circuits in television receivers. Electrically identical to the 6CG7 except for heater ratings.","is_directly_heated":false,"completeness":"high","notes":["12.6V heater version of the 6CG7/6FQ7, with the heater winding centre-tapped for optional 6.3V operation. Heater current is 0.3A at 12.6V (vs 0.6A at 6.3V for the 6CG7).","Designed for series-string heater chains in AC/DC television receivers where a 12.6V heater segment is required.","Electrically identical to the 6CG7 — same mu=20, gm=2.6 mA/V, ra=7700 ohms at Va=250V, Vg=-8V.","Maximum grid circuit resistance is 1.0 MOhm with fixed bias, 2.2 MOhm with cathode bias."],"references":["https://frank.pocnet.net/sheets/093/6/6CG7.pdf"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=12CG7","radiomuseum":"https://www.radiomuseum.org/tubes/tube_12cg7.html"},"raw_equivalents":["12FQ7"],"equivalents":[],"similar":[{"type_number":"6CG7","reason":"Electrically identical but 6.3V/0.6A heater — not a drop-in in 12.6V series heater circuits","has_detail_page":true},{"type_number":"6FQ7","reason":"Electrically identical but 6.3V/0.6A heater — not a drop-in in 12.6V series heater circuits","has_detail_page":false},{"type_number":"6SN7GT","reason":"Electrically near-identical (same mu, gm, ra) but Octal base — not pin-compatible","has_detail_page":false},{"type_number":"7N7","reason":"Electrically identical but Loctal base — not pin-compatible with Noval","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Plate (Section 2)","function_code":"a2","notes":null},{"pin_number":"2","function":"Grid (Section 2)","function_code":"g1_2","notes":null},{"pin_number":"3","function":"Cathode (Section 2)","function_code":"k2","notes":null},{"pin_number":"4","function":"Heater","function_code":"h","notes":null},{"pin_number":"5","function":"Heater","function_code":"h","notes":null},{"pin_number":"6","function":"Plate (Section 1)","function_code":"a1","notes":null},{"pin_number":"7","function":"Grid (Section 1)","function_code":"g1_1","notes":null},{"pin_number":"8","function":"Cathode (Section 1)","function_code":"k1","notes":null},{"pin_number":"9","function":"Internal Shield","function_code":"ia","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":"300","numeric_value":"300","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"3.5","numeric_value":"3.5","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":"Rg_max","display_name":"Max Grid Resistor","value":"1.0","numeric_value":"1","unit":"MΩ","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":"4.0","numeric_value":"4","unit":"pF","param_group":"capacitances"},{"key":"Cin","display_name":"Input Capacitance","value":"2.3","numeric_value":"2.3","unit":"pF","param_group":"capacitances"},{"key":"Cout","display_name":"Output Capacitance","value":"2.2","numeric_value":"2.2","unit":"pF","param_group":"capacitances"}]}],"synced_at":"2026-04-07T12:04:46.408Z"}