{"type_number":"6P5GT","canonical_url":"https://tubeofile.com/tubes/6P5GT","manufacturer":"Tung-Sol","tube_type_key":"small_signal_triode","tube_type_display_name":"Small Signal Triode","base_name":"Octal","description":"General-purpose medium-mu triode designed for service as an oscillator, detector, or amplifier. Octal base (intermediate 6-pin), indirectly heated. Electrical characteristics identical to the type 76. Glass bulb T-9 envelope.","is_directly_heated":false,"completeness":"high","notes":["From Tung-Sol/RCA datasheets: the 6P5GT/G is a detector amplifier triode with electrical characteristics identical to the type 76.","Maximum ratings: Va_max=250V, Pa_max=1.25W.","Typical operating conditions at Va=250V: Vg=-13.5V, Ia=5mA, ra=9500Ω, gm=1450 µmhos, mu=13.8.","At Va=100V: Vg=-5V, Ia=2.5mA, ra=12000Ω, gm=1150 µmhos, mu=13.8.","Uses intermediate 6-pin Octal base (G-6Qa pattern). Pin 1 is No Connection.","Curves for the 6P5GT/G are the same as for the 56 and the 76 per the datasheets."],"references":["https://frank.pocnet.net/sheets/127/6/6P5GT.pdf","https://frank.pocnet.net/sheets/049/6/6P5G.pdf","https://www.radiomuseum.org/tubes/tube_6p5gt.html"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=6P5GT","radiomuseum":"https://www.radiomuseum.org/tubes/tube_6p5gt.html"},"raw_equivalents":["6P5G","76","CV1067"],"equivalents":[{"type_number":"76","equivalence_type":"direct","notes":null}],"similar":[{"type_number":"56","reason":"Earlier type with same electricals but UY5 base — not pin-compatible","has_detail_page":true},{"type_number":"6C5","reason":"Similar single triode with same Octal pinout — different mu (20 vs 13.8)","has_detail_page":true},{"type_number":"6J5","reason":"Similar medium-mu triode (mu=20 vs 13.8) with Octal base — close but different electrical characteristics","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":"Anode","function_code":"a","notes":null},{"pin_number":"5","function":"Grid","function_code":"g1","notes":null},{"pin_number":"7","function":"Heater","function_code":"h","notes":null},{"pin_number":"8","function":"Cathode","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":"0.3","numeric_value":"0.3","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":"250","numeric_value":"250","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"1.25","numeric_value":"1.25","unit":"W","param_group":"absolute_max"},{"key":"Rg_max","display_name":"Max Grid Resistor","value":"1.0","numeric_value":"1","unit":"MΩ","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":"-13.5","numeric_value":"-13.5","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"5.0","numeric_value":"5","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"9500","numeric_value":"9500","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"1.45","numeric_value":"1.45","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"13.8","numeric_value":"13.8","unit":"—","param_group":"typical_operating"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"2.6","numeric_value":"2.6","unit":"pF","param_group":"capacitances"},{"key":"Cgk","display_name":"Grid-to-Cathode Capacitance","value":"3.4","numeric_value":"3.4","unit":"pF","param_group":"capacitances"},{"key":"Cak","display_name":"Anode-to-Cathode Capacitance","value":"5.5","numeric_value":"5.5","unit":"pF","param_group":"capacitances"}]}],"synced_at":"2026-04-07T12:28:03.337Z"}