{"type_number":"6AM4","canonical_url":"https://tubeofile.com/tubes/6AM4","manufacturer":"General Electric","tube_type_key":"small_signal_triode","tube_type_display_name":"Small Signal Triode","base_name":"Noval","description":"Miniature high-mu triode designed for use as a grounded-grid mixer or amplifier in television receivers operating in the UHF region. Sharp cutoff and high transconductance with excellent input-output isolation.","is_directly_heated":false,"completeness":"high","notes":["Five of the nine pins are connected to the grid — when used in grounded-grid operation at high frequencies, all five grid terminals should be grounded to minimize grid-lead inductance.","In cascode amplifier configurations with two tubes in series, the heater-cathode voltage under cutoff conditions may reach 250V.","Interelectrode capacitances with external shield (RETMA 315) connected to grid: Plate-to-Cathode 0.16pF, Cgk 4.6pF (vs 4.4pF without), Cgp 2.8pF (vs 2.4pF without)."],"references":["https://frank.pocnet.net/sheets/093/6/6AM4.pdf"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=6AM4","radiomuseum":"https://www.radiomuseum.org/tubes/tube_6am4.html"},"raw_equivalents":["CV5073"],"equivalents":[],"similar":[],"pins":[{"pin_number":"1","function":"Grid","function_code":"g1","notes":null},{"pin_number":"2","function":"Cathode","function_code":"k","notes":null},{"pin_number":"3","function":"Grid","function_code":"g1","notes":null},{"pin_number":"4","function":"Grid","function_code":"g1","notes":null},{"pin_number":"5","function":"Plate","function_code":"a","notes":null},{"pin_number":"6","function":"Grid","function_code":"g1","notes":null},{"pin_number":"7","function":"Heater","function_code":"h","notes":null},{"pin_number":"8","function":"Heater","function_code":"h","notes":null},{"pin_number":"9","function":"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":"0.225","numeric_value":"0.225","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":"200","numeric_value":"200","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"2","numeric_value":"2","unit":"W","param_group":"absolute_max"},{"key":"Vhk_max","display_name":"Heater-to-Cathode Voltage (max)","value":"80","numeric_value":"80","unit":"V","param_group":"absolute_max"},{"key":"Va","display_name":"Anode Voltage (typical)","value":"200","numeric_value":"200","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"10","numeric_value":"10","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"8700","numeric_value":"8700","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"9.8","numeric_value":"9.8","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"85","numeric_value":"85","unit":"—","param_group":"typical_operating"},{"key":"Rk","display_name":"Cathode Resistor (self-bias)","value":"100","numeric_value":"100","unit":"Ω","param_group":"typical_operating"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"2.4","numeric_value":"2.4","unit":"pF","param_group":"capacitances"},{"key":"Cgk","display_name":"Grid-to-Cathode Capacitance","value":"4.4","numeric_value":"4.4","unit":"pF","param_group":"capacitances"},{"key":"Cak","display_name":"Anode-to-Cathode Capacitance","value":"0.16","numeric_value":"0.16","unit":"pF","param_group":"capacitances"}]}],"synced_at":"2026-04-07T12:15:56.847Z"}