{"type_number":"6533","canonical_url":"https://tubeofile.com/tubes/6533","manufacturer":"GE","tube_type_key":"small_signal_triode","tube_type_display_name":"Small Signal Triode","base_name":"Noval","description":"High-mu dual triode designed for series voltage regulator and DC amplifier applications. Miniature construction on an 8-pin base. Each section has separate cathode connections for independent operation.","is_directly_heated":false,"completeness":"medium","notes":["Designed primarily for series voltage regulator service and DC amplifier applications.","GE Essential Characteristics: Pa_max 0.35 W per section, Va_max 150 V, Va(typ) 120 V, Rp 31000 ohms, gm 1750 umhos.","6533WA is the ruggedized military version with tighter parameter controls.","RCA interchange guide lists 6080 as similar — but 6080 is a much larger tube intended for heavier-duty regulator circuits."],"references":["https://tdsl.duncanamps.com/show.php?des=6533"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=6533","radiomuseum":"https://www.radiomuseum.org/tubes/tube_6533.html"},"raw_equivalents":["6533WA"],"equivalents":[],"similar":[{"type_number":"6080","reason":"RCA interchange lists 6080 as similar — both designed for regulator service but 6080 is a medium-mu power dual triode with much higher current capability and Octal base","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Anode (section 1)","function_code":"a1","notes":null},{"pin_number":"2","function":"Control Grid (section 1)","function_code":"g1_1","notes":null},{"pin_number":"3","function":"Cathode (section 1)","function_code":"k1","notes":null},{"pin_number":"4","function":"Heater","function_code":"h","notes":null},{"pin_number":"5","function":"Heater","function_code":"h","notes":null},{"pin_number":"6","function":"Anode (section 2)","function_code":"a2","notes":null},{"pin_number":"7","function":"Control Grid (section 2)","function_code":"g1_2","notes":null},{"pin_number":"8","function":"Cathode (section 2)","function_code":"k2","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 (each section)","tube_type_key":"small_signal_triode","specs":[{"key":"Va_max","display_name":"Anode Voltage (max)","value":"150","numeric_value":"150","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"0.35","numeric_value":"0.35","unit":"W","param_group":"absolute_max"},{"key":"Va","display_name":"Anode Voltage (typical)","value":"120","numeric_value":"120","unit":"V","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"31000","numeric_value":"31000","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"1.75","numeric_value":"1.75","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"54","numeric_value":"54","unit":"—","param_group":"typical_operating"}]}],"synced_at":"2026-04-07T12:14:04.147Z"}