{"type_number":"CV1135","canonical_url":"https://tubeofile.com/tubes/CV1135","manufacturer":"MO Valve Co. Ltd. (GEC)","tube_type_key":"small_signal_triode","tube_type_display_name":"Small Signal Triode","base_name":"Octal","description":"VHF/UHF oscillator triode developed from the 6J5GT, with grid and anode brought to top caps via short low-inductance leads for high-frequency operation up to 300 MHz. Intended for pulsed operation at 300V, 120 mA peak. Used in WWII military communications equipment including the Wireless Set No. 19.","is_directly_heated":false,"completeness":"high","notes":["Grid and anode are both on top caps (not base pins) to minimise lead inductance for VHF/UHF use — not pin-compatible with standard octal triodes like 6J5 despite being electrically derived from it.","Heater current varies between sources: 0.2 A (radiomuseum.org, r-type.org abm0004) vs 0.3 A (r-type.org acl0172). The 0.2 A figure is more widely cited.","The 7193 and 2C22 are sometimes listed as equivalents; these share the same dual-top-cap VHF triode design but may have different ratings.","Anode resistance (ra) of 6667 Ω is derived from mu/gm (20 / 3.0 mA/V), not directly stated in available sources."],"references":["https://www.r-type.org/exhib/acl0172.htm","https://www.r-type.org/exhib/abm0004.htm","https://www.radiomuseum.org/tubes/tube_cv1135.html"],"source_urls":{"r_type":"https://www.r-type.org/exhib/abm0004.htm","tdsl":"https://tdsl.duncanamps.com/show.php?des=CV1135","radiomuseum":"https://www.radiomuseum.org/tubes/tube_cv1135.html"},"raw_equivalents":["E1148","CV6","CV2920","VR135","VT-232","DET20","HY615","6S8S","6C8C","7193","2C22","6C8P"],"equivalents":[],"similar":[{"type_number":"6J5","reason":"Electrically derived from 6J5 but has dual top caps (grid + anode) for VHF — completely different pin topology","has_detail_page":true},{"type_number":"6S3P","reason":"Russian VHF triode, different base","has_detail_page":true},{"type_number":"EC86","reason":"VHF triode but Noval base — different from CV1135's Octal+dual top cap","has_detail_page":true}],"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":"No Connection","function_code":"nc","notes":null},{"pin_number":"4","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"5","function":"No Connection","function_code":"nc","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","function_code":"k","notes":null},{"pin_number":"TC1","function":"Anode (top cap)","function_code":"a","notes":null},{"pin_number":"TC2","function":"Control Grid (top cap)","function_code":"g1","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":"0.2","numeric_value":"0.2","unit":"A","param_group":"heater"}],"sections":[{"section_number":1,"section_label":"Triode","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":"Va","display_name":"Anode Voltage (typical)","value":"300","numeric_value":"300","unit":"V","param_group":"typical_operating"},{"key":"Vg","display_name":"Grid 1 Bias Voltage","value":"-10.5","numeric_value":"-10.5","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"11","numeric_value":"11","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"6667","numeric_value":"6667","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"3.0","numeric_value":"3","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":"Pout","display_name":"Output Power","value":"4.25","numeric_value":"4.25","unit":"W","param_group":"output"},{"key":"freq","display_name":"Max Operating Frequency","value":"300","numeric_value":"300","unit":"MHz","param_group":"noise_rf"}]}],"synced_at":"2026-04-07T12:36:55.551Z"}