{"type_number":"7C5","canonical_url":"https://tubeofile.com/tubes/7C5","manufacturer":"Sylvania","tube_type_key":"beam_tetrode","tube_type_display_name":"Beam Tetrode","base_name":"Loctal","description":"Beam power amplifier on Loctal base. Electrically identical to the 6V6 but with an 8-pin Loctal (lock-in) base instead of Octal. Designed for audio output service in receivers using Loctal-base tube complement.","is_directly_heated":false,"completeness":"high","notes":["Loctal (lock-in) base — the 8-pin base has a metal locking ring. Not compatible with Octal or Noval sockets.","Electrically identical to the 6V6/6V6GT — same operating conditions, same output power.","GE Essential Characteristics: Pa_max 12 W, Va_max 315 V, Vs_max 285 V, Va(typ) 315V (or 250V), Vs(typ) 225V, Vg=-13V, Ia=34mA, Is=2.2mA, gm=3750, Rp=77000, Pout=5.5W.","Brans Vademecum lists CV885 as the British military equivalent.","Sams lists EL22, KT81, PCF86 as substitutes — verify compatibility.","Raytheon data confirms: Va=250V, Vs=225V, Vg=-13V, Ia=34mA, gm=3750, Rp=77000, Pout=5.5W, rl=8500."],"references":["https://frank.pocnet.net/sheets/127/7/7C5.pdf","https://tdsl.duncanamps.com/show.php?des=7C5"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=7C5","radiomuseum":"https://www.radiomuseum.org/tubes/tube_7c5.html"},"raw_equivalents":["CV885"],"equivalents":[],"similar":[{"type_number":"6AQ5","reason":"Electrically similar beam tetrode but miniature B7G base — not pin-compatible","has_detail_page":true},{"type_number":"6V6","reason":"Electrically identical but Octal base — not compatible with Loctal sockets","has_detail_page":true},{"type_number":"6V6GT","reason":"Electrically identical but Octal base — not compatible with Loctal sockets","has_detail_page":false}],"pins":[{"pin_number":"1","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"2","function":"Heater","function_code":"h","notes":null},{"pin_number":"3","function":"Anode (Plate)","function_code":"a","notes":null},{"pin_number":"4","function":"Screen Grid (g2)","function_code":"g2","notes":null},{"pin_number":"5","function":"Control Grid (g1)","function_code":"g1","notes":null},{"pin_number":"6","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"7","function":"Heater","function_code":"h","notes":null},{"pin_number":"8","function":"Cathode & Beam-Forming Plates","function_code":"k","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":"0.45","numeric_value":"0.45","unit":"A","param_group":"heater"}],"sections":[{"section_number":1,"section_label":"Beam Tetrode","tube_type_key":"beam_tetrode","specs":[{"key":"Va_max","display_name":"Anode Voltage (max)","value":"315","numeric_value":"315","unit":"V","param_group":"absolute_max"},{"key":"Vs_max","display_name":"Screen Voltage (max)","value":"285","numeric_value":"285","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"12","numeric_value":"12","unit":"W","param_group":"absolute_max"},{"key":"Ps_max","display_name":"Screen Dissipation (max)","value":"2.2","numeric_value":"2.2","unit":"W","param_group":"absolute_max"},{"key":"Ik_max","display_name":"Cathode Current (max)","value":"52","numeric_value":"52","unit":"mA","param_group":"absolute_max"},{"key":"Va","display_name":"Anode Voltage (typical)","value":"250","numeric_value":"250","unit":"V","param_group":"typical_operating"},{"key":"Vs","display_name":"Screen Voltage (typical)","value":"225","numeric_value":"225","unit":"V","param_group":"typical_operating"},{"key":"Vg","display_name":"Grid 1 Bias Voltage","value":"-13","numeric_value":"-13","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"34","numeric_value":"34","unit":"mA","param_group":"typical_operating"},{"key":"mAs","display_name":"Screen Current","value":"2.2","numeric_value":"2.2","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"77000","numeric_value":"77000","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"3.75","numeric_value":"3.75","unit":"mA/V","param_group":"typical_operating"},{"key":"Pout","display_name":"Output Power","value":"5.5","numeric_value":"5.5","unit":"W","param_group":"output"},{"key":"rl","display_name":"Load Impedance","value":"8500","numeric_value":"8500","unit":"Ω","param_group":"output"}]}],"synced_at":"2026-04-07T12:32:23.022Z"}