{"type_number":"6AK5","canonical_url":"https://tubeofile.com/tubes/6AK5","manufacturer":"RCA","tube_type_key":"ss_pentode","tube_type_display_name":"Small Signal Pentode","base_name":"B7G","description":"Sharp-cutoff RF pentode, 7-pin miniature type. Designed for IF amplifier and wideband applications at frequencies up to 400 MHz. High transconductance for its size with low interelectrode capacitances.","is_directly_heated":false,"completeness":"high","notes":["Suppressor grid (g3) is internally connected to cathode.","Pin 2 (cathode) and pin 7 (cathode) are connected internally — both must be grounded for proper RF shielding.","Screen dissipation limit is 0.5 W for screen voltages up to 90 V. For screen voltages between 90 V and 180 V, see the RCA Grid-No.2 Input Rating Chart.","MIL-HDBK-213A lists 6AK5W and CK6AK5 as alternate designations. 5654/6AK5W is the reliable/ruggedized military version.","Brimar rates Vg2_max at 90 V (conservative), while RCA rates the screen supply voltage at 180 V max. The actual screen voltage depends on the application and dissipation limits.","Capacitance values without external shield: Cgp=0.03 pF max, Cin=4.0 pF, Cout=2.1 pF. With external shield: Cgp=0.02 pF max, Cout=2.8 pF (shield adds anode capacitance).","Triode-strapped data from Mullard EF95 datasheet: mu=35, gm=6.8 mA/V, ra=5200 Ohm at Va=120 V, Ia=10 mA."],"references":["https://frank.pocnet.net/sheets/049/6/6AK5.pdf","https://frank.pocnet.net/sheets/129/e/EF95.pdf","https://tdsl.duncanamps.com/show.php?des=6AK5"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=6AK5","radiomuseum":"https://www.radiomuseum.org/tubes/tube_6ak5.html"},"raw_equivalents":["EF95","5654","CV850","6AK5W","CK6AK5","6096","M8100","6J1","408A","PM05","6F32","E95F","6069","5743"],"equivalents":[{"type_number":"5743","equivalence_type":"direct","notes":null},{"type_number":"EF95","equivalence_type":"direct","notes":null}],"similar":[{"type_number":"5690","reason":"Same base and similar characteristics but different heater current (0.15 A vs 0.175 A)","has_detail_page":false},{"type_number":"6AH6","reason":"Higher-gm sharp-cutoff pentode on same B7G base but different pinout and much higher plate current — not a drop-in","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Control Grid","function_code":"g1","notes":null},{"pin_number":"2","function":"Cathode, Suppressor Grid (g3 internal)","function_code":"k","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":"Anode","function_code":"a","notes":null},{"pin_number":"6","function":"Screen Grid","function_code":"g2","notes":null},{"pin_number":"7","function":"Cathode, Suppressor Grid (g3 internal)","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":"0.175","numeric_value":"0.175","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":"180","numeric_value":"180","unit":"V","param_group":"absolute_max"},{"key":"Vs_max","display_name":"Screen Voltage (max)","value":"180","numeric_value":"180","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"1.7","numeric_value":"1.7","unit":"W","param_group":"absolute_max"},{"key":"Ps_max","display_name":"Screen Dissipation (max)","value":"0.5","numeric_value":"0.5","unit":"W","param_group":"absolute_max"},{"key":"Ik_max","display_name":"Cathode Current (max)","value":"18","numeric_value":"18","unit":"mA","param_group":"absolute_max"},{"key":"Vhk_max","display_name":"Heater-to-Cathode Voltage (max)","value":"120","numeric_value":"120","unit":"V","param_group":"absolute_max"},{"key":"Va","display_name":"Anode Voltage (typical)","value":"180","numeric_value":"180","unit":"V","param_group":"typical_operating"},{"key":"Vs","display_name":"Screen Voltage (typical)","value":"120","numeric_value":"120","unit":"V","param_group":"typical_operating"},{"key":"Vg","display_name":"Grid 1 Bias Voltage","value":"-2","numeric_value":"-2","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"7.7","numeric_value":"7.7","unit":"mA","param_group":"typical_operating"},{"key":"mAs","display_name":"Screen Current","value":"2.4","numeric_value":"2.4","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"500000","numeric_value":"500000","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"5.1","numeric_value":"5.1","unit":"mA/V","param_group":"typical_operating"},{"key":"Rk","display_name":"Cathode Resistor (self-bias)","value":"180","numeric_value":"180","unit":"Ω","param_group":"typical_operating"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"0.03","numeric_value":"0.03","unit":"pF","param_group":"capacitances"},{"key":"Cgk","display_name":"Grid-to-Cathode Capacitance","value":"4.0","numeric_value":"4","unit":"pF","param_group":"capacitances"},{"key":"Cak","display_name":"Anode-to-Cathode Capacitance","value":"2.1","numeric_value":"2.1","unit":"pF","param_group":"capacitances"}]},{"section_number":2,"section_label":"Triode Strapped","tube_type_key":"small_signal_triode","specs":[{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"1.7","numeric_value":"1.7","unit":"W","param_group":"absolute_max"},{"key":"Ik_max","display_name":"Cathode Current (max)","value":"18","numeric_value":"18","unit":"mA","param_group":"absolute_max"},{"key":"Va","display_name":"Anode Voltage (typical)","value":"120","numeric_value":"120","unit":"V","param_group":"typical_operating"},{"key":"Vg","display_name":"Grid 1 Bias Voltage","value":"-2","numeric_value":"-2","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":"5200","numeric_value":"5200","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"6.8","numeric_value":"6.8","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"35","numeric_value":"35","unit":"—","param_group":"typical_operating"}]}],"synced_at":"2026-04-07T19:02:12.146Z"}