{"type_number":"6C6","canonical_url":"https://tubeofile.com/tubes/6C6","manufacturer":"Tung-Sol","tube_type_key":"ss_pentode","tube_type_display_name":"Small Signal Pentode","base_name":"UX6","description":"Triple-grid (sharp-cutoff pentode) detector amplifier with unipotential cathode. Small 6-pin base (UX6). Electrically identical to the 6J7G and 6J7GT except for capacitances. Introduced by RCA circa 1932.","is_directly_heated":false,"completeness":"medium","notes":["The 6C6 is electrically identical to the 6J7G/GT except for interelectrode capacitances. Uses the older 6-pin base (6F/UX6) whereas the 6J7 uses octal.","Can be used in triode connection (suppressor grid and screen tied to plate). In triode mode: Va max 250V, Pa max 1.75W, mu=20, gm=1800 umhos, Rp=11kΩ.","Top-cap connection for control grid (pin TC)."],"references":["https://frank.pocnet.net/sheets/127/6/6C6.pdf","https://tdsl.duncanamps.com/show.php?des=6C6"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=6C6","radiomuseum":"https://www.radiomuseum.org/tubes/tube_6c6.html"},"raw_equivalents":["6J7","6J7G","6J7GT","57","77","1221","CV585"],"equivalents":[{"type_number":"6J7","equivalence_type":"direct","notes":null}],"similar":[{"type_number":"6BR7","reason":"Brans lists as equivalent but different base — not pin-compatible","has_detail_page":true},{"type_number":"6D6","reason":"Same envelope and base, remote-cutoff version — not interchangeable in RF/IF circuits requiring sharp cutoff","has_detail_page":true},{"type_number":"7A7","reason":"Similar electricals but Loctal base — not pin-compatible","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Grid 2 (Screen)","function_code":"g2","notes":null},{"pin_number":"2","function":"Anode","function_code":"a","notes":null},{"pin_number":"3","function":"Heater","function_code":"h","notes":null},{"pin_number":"4","function":"Heater","function_code":"h","notes":null},{"pin_number":"5","function":"Cathode, Grid 3 (Suppressor)","function_code":"k_g3","notes":null},{"pin_number":"TC","function":"Grid 1 (Control Grid)","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":"0.3","numeric_value":"0.3","unit":"A","param_group":"heater"}],"sections":[{"section_number":1,"section_label":"Pentode","tube_type_key":"ss_pentode","specs":[{"key":"Va_max","display_name":"Anode Voltage (max)","value":"300","numeric_value":"300","unit":"V","param_group":"absolute_max"},{"key":"Vg2_max","display_name":"Screen Voltage (max)","value":"125","numeric_value":"125","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"0.75","numeric_value":"0.75","unit":"W","param_group":"absolute_max"},{"key":"Pg2_max","display_name":"Screen Dissipation (max)","value":"0.1","numeric_value":"0.1","unit":"W","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":"-3","numeric_value":"-3","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"2","numeric_value":"2","unit":"mA","param_group":"typical_operating"},{"key":"Vg2","display_name":"Screen Voltage","value":"100","numeric_value":"100","unit":"V","param_group":"typical_operating"},{"key":"mAg2","display_name":"Screen Current","value":"0.5","numeric_value":"0.5","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"1000000","numeric_value":"1000000","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"1.225","numeric_value":"1.225","unit":"mA/V","param_group":"typical_operating"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"0.007","numeric_value":"0.007","unit":"pF","param_group":"capacitances"},{"key":"Cgk","display_name":"Grid-to-Cathode Capacitance","value":"5","numeric_value":"5","unit":"pF","param_group":"capacitances"},{"key":"Cak","display_name":"Anode-to-Cathode Capacitance","value":"6.5","numeric_value":"6.5","unit":"pF","param_group":"capacitances"}]}],"synced_at":"2026-04-07T12:19:37.088Z"}