{"type_number":"AL860","canonical_url":"https://tubeofile.com/tubes/AL860","manufacturer":"VEB Röhrenwerk 'Anna Seghers' Neuhaus (GDR/East Germany)","tube_type_key":"power_pentode","tube_type_display_name":"Power Pentode","base_name":"Noval","description":"East German (GDR) directly-heated power output pentode manufactured by VEB Röhrenwerk 'Anna Seghers' Neuhaus. Electrically similar to the 4P1L/RL2,4P6 family (DHT, centre-tapped filament, pentode topology) but built on a 9-pin Noval (B9A) miniature base instead of the Loctal base used by its Soviet and Wehrmacht cousins. Not pin-for-pin compatible.","is_directly_heated":true,"completeness":"low","notes":["East German production — VEB Röhrenwerk 'Anna Seghers' in Neuhaus am Rennweg, one of the main GDR tube manufacturers.","DHT (directly heated cathode) with centre-tapped filament. Can be wired 4.8V @ 0.28A (parallel ends) or 2.4V @ 0.56A (series via centre tap).","Noval (B9A) base — distinguishes it from the Loctal-based 4P1L/RL2,4P6/4L20 family that it is otherwise electrically related to.","Relatively obscure tube — complete published electrical specifications are sparse outside Radiomuseum references."],"references":["https://www.radiomuseum.org/tubes/tube_al860.html","https://datasheetspdf.com/datasheet/AL860.html"],"source_urls":{"r_type":null,"tdsl":null,"radiomuseum":"https://www.radiomuseum.org/tubes/tube_al860.html"},"raw_equivalents":[],"equivalents":[],"similar":[{"type_number":"4L20","reason":"Tesla equivalent of 4P1L on Loctal base","has_detail_page":true},{"type_number":"4P1L","reason":"Electrically related DHT pentode but on Loctal base (different socket) with 2.1V/4.2V filament instead of 4.8V/2.4V","has_detail_page":true},{"type_number":"RL2,4P6","reason":"Wehrmacht predecessor with similar topology but Loctal base and lower filament voltage","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Unknown","function_code":"nc","notes":null},{"pin_number":"2","function":"Unknown","function_code":"nc","notes":null},{"pin_number":"3","function":"Unknown","function_code":"nc","notes":null},{"pin_number":"4","function":"Unknown","function_code":"nc","notes":null},{"pin_number":"5","function":"Unknown","function_code":"nc","notes":null},{"pin_number":"6","function":"Unknown","function_code":"nc","notes":null},{"pin_number":"7","function":"Unknown","function_code":"nc","notes":null},{"pin_number":"8","function":"Unknown","function_code":"nc","notes":null},{"pin_number":"9","function":"Unknown","function_code":"nc","notes":null}],"specs":[{"key":"Vh","display_name":"Heater Voltage","value":"4.8","numeric_value":"4.8","unit":"V","param_group":"heater"},{"key":"Ah","display_name":"Heater Current","value":"0.28","numeric_value":"0.28","unit":"A","param_group":"heater"}],"sections":[{"section_number":1,"section_label":"Pentode","tube_type_key":"power_pentode","specs":[]}],"synced_at":"2026-04-07T12:35:56.427Z"}