{"type_number":"6/30L2","canonical_url":"https://tubeofile.com/tubes/6%2F30L2","manufacturer":"Mazda","tube_type_key":"small_signal_triode","tube_type_display_name":"Small Signal Triode","base_name":"Noval","description":"General purpose double triode with internal screen between sections, intended for use in television receivers. Suitable for AC/DC or AC operation, including phase splitting to feed a further gain stage. The two triodes have identical characteristics.","is_directly_heated":false,"completeness":"high","notes":["British Mazda designation; the Mullard-system equivalent is ECC804 and the US RETMA equivalent is 6GA8.","Contains an internal electrostatic screen (pin 9) between the two triode sections to reduce inter-section coupling. The potential of the internal shield must not be positive to that of either cathode.","The permissible anode dissipation rating (2.0W per section) is dependent on the grid-to-cathode resistance and the circuit employed. For the values quoted, the grid-to-cathode resistance should not exceed 0.25 MΩ with cathode self bias.","Maximum total anode dissipation (both sections combined) is 2.5W.","Heater-to-cathode voltage max (150V RMS) is measured with respect to the higher potential heater pin.","Datasheet marked 'TENTATIVE' — issued January 1958 by Siemens Edison Swan Limited (Valve & CRT Division)."],"references":["https://tube-data.com/sheets/147/6/6-30L2.pdf","https://brimaruk.com/BrimarUK/wp-content/uploads/Brimar-ECC804-DataSheet.pdf"],"source_urls":{"r_type":"https://www.r-type.org/exhib/aaq0069.htm","tdsl":"https://tdsl.duncanamps.com/show.php?des=630L2","radiomuseum":"https://www.radiomuseum.org/tubes/tube_630l2.html"},"raw_equivalents":["ECC804","6GA8","B729","CV5264","6103"],"equivalents":[],"similar":[{"type_number":"12BH7","reason":"Noval twin triode with similar mu (16.5 vs 18) and gm (3.1 vs 3.4 mA/V) but 12.6V heater with center-tap vs 6.3V only, and significantly higher Pa_max (3.5W vs 2.0W per section). Pin 9 is heater CT on 12BH7 vs internal screen on 6/30L2.","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Anode 2","function_code":"a2","notes":null},{"pin_number":"2","function":"Control Grid 2","function_code":"g1_2","notes":null},{"pin_number":"3","function":"Cathode 2","function_code":"k2","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 1","function_code":"a1","notes":null},{"pin_number":"7","function":"Control Grid 1","function_code":"g1_1","notes":null},{"pin_number":"8","function":"Cathode 1","function_code":"k1","notes":null},{"pin_number":"9","function":"Internal Screen","function_code":"ia","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":"2.0","numeric_value":"2","unit":"W","param_group":"absolute_max"},{"key":"Vhk_max","display_name":"Heater-to-Cathode Voltage (max)","value":"150","numeric_value":"150","unit":"V","param_group":"absolute_max"},{"key":"Rg_max","display_name":"Max Grid Resistor","value":"0.25","numeric_value":"0.25","unit":"MΩ","param_group":"absolute_max"},{"key":"Va","display_name":"Anode Voltage (typical)","value":"200","numeric_value":"200","unit":"V","param_group":"typical_operating"},{"key":"Vg","display_name":"Grid 1 Bias Voltage","value":"-7.7","numeric_value":"-7.7","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":"5300","numeric_value":"5300","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"3.4","numeric_value":"3.4","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"18","numeric_value":"18","unit":"—","param_group":"typical_operating"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"2.5","numeric_value":"2.5","unit":"pF","param_group":"capacitances"},{"key":"Cgk","display_name":"Grid-to-Cathode Capacitance","value":"2.5","numeric_value":"2.5","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"}]}],"synced_at":"2026-04-07T12:13:29.156Z"}