{"type_number":"CV1501","canonical_url":"https://tubeofile.com/tubes/CV1501","manufacturer":null,"tube_type_key":"beam_tetrode","tube_type_display_name":"Beam Tetrode","base_name":"Octal","description":"R.F. beam power amplifier, small low-power VHF transmitting beam tetrode used in WWII","is_directly_heated":false,"completeness":"medium","notes":["Top-cap anode connection — not a standard octal pinout. Pin 6 is omitted (blank pin may be supplied at manufacturer's discretion).","Pin 3 (beam forming plates) should be connected to cathode for normal operation.","Originally designed as an RF power amplifier for VHF military transmitters (up to 200 MHz), but was widely used as an audio output valve in post-war TRF broadcast receiver kits due to cheap surplus availability.","Grid-screen amplification factor (mu_g1g2) is 6.7 — this is not the overall amplification factor but the ratio between control grid and screen grid.","Specification MAP/CV1501/Issue 8, dated 10.3.47, to be read in conjunction with K1001. Manufactured by multiple UK firms including ETEL (Electronic Tubes, High Wycombe) and Gilbert Photoelectrics."],"references":["http://www.r-type.org/pdfs/cv1501.pdf","http://www.r-type.org/exhib/aaa0312.htm","https://www.valvecollector.uk/cv1501.htm"],"source_urls":{"r_type":"http://www.r-type.org/exhib/aaa0312.htm","tdsl":"http://tdsl.duncanamps.com/show.php?des=CV1501","radiomuseum":null},"raw_equivalents":["CV1002","E1192","TT11","VT501"],"equivalents":[],"similar":[],"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":"Beam Forming Plates (Suppressor Grid)","function_code":"g3","notes":null},{"pin_number":"4","function":"Control Grid","function_code":"g1","notes":null},{"pin_number":"5","function":"Screen Grid","function_code":"g2","notes":null},{"pin_number":"6","function":"No Connection (pin omitted)","function_code":"nc","notes":null},{"pin_number":"7","function":"Heater","function_code":"h","notes":null},{"pin_number":"8","function":"Cathode","function_code":"k","notes":null},{"pin_number":"tc","function":"Anode (Top Cap)","function_code":"a","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":"0.8","numeric_value":"0.8","unit":"A","param_group":"heater"}],"sections":[{"section_number":1,"section_label":"Beam Tetrode","tube_type_key":"beam_tetrode","specs":[{"key":"Va_max","display_name":"Anode Voltage (max)","value":"300","numeric_value":"300","unit":"V","param_group":"absolute_max"},{"key":"Vs_max","display_name":"Screen Voltage (max)","value":"250","numeric_value":"250","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"7.5","numeric_value":"7.5","unit":"W","param_group":"absolute_max"},{"key":"Ps_max","display_name":"Screen Dissipation (max)","value":"1.3","numeric_value":"1.3","unit":"W","param_group":"absolute_max"},{"key":"Ik_max","display_name":"Cathode Current (max)","value":"45","numeric_value":"45","unit":"mA","param_group":"absolute_max"},{"key":"Va","display_name":"Anode Voltage (typical)","value":"250","numeric_value":"250","unit":"V","param_group":"typical_operating"},{"key":"Vs","display_name":"Screen Voltage (typical)","value":"135","numeric_value":"135","unit":"V","param_group":"typical_operating"},{"key":"Vg","display_name":"Grid 1 Bias Voltage","value":"-11","numeric_value":"-11","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"30","numeric_value":"30","unit":"mA","param_group":"typical_operating"},{"key":"mAs","display_name":"Screen Current","value":"8","numeric_value":"8","unit":"mA","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"3.5","numeric_value":"3.5","unit":"mA/V","param_group":"typical_operating"},{"key":"Pout","display_name":"Output Power","value":"4.8","numeric_value":"4.8","unit":"W","param_group":"output"},{"key":"rl","display_name":"Load Impedance","value":"4100","numeric_value":"4100","unit":"Ω","param_group":"output"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"0.4","numeric_value":"0.4","unit":"pF","param_group":"capacitances"},{"key":"Cin","display_name":"Input Capacitance","value":"9.1","numeric_value":"9.1","unit":"pF","param_group":"capacitances"},{"key":"Cout","display_name":"Output Capacitance","value":"2.6","numeric_value":"2.6","unit":"pF","param_group":"capacitances"},{"key":"freq","display_name":"Max Operating Frequency","value":"200","numeric_value":"200","unit":"MHz","param_group":"noise_rf"},{"key":null,"display_name":"Driving Power","value":"0.12","numeric_value":"0.12","unit":"W","param_group":null},{"key":null,"display_name":"Grid-Screen Amplification Factor","value":"6.7","numeric_value":"6.7","unit":null,"param_group":null}]}],"synced_at":"2026-04-07T12:37:01.399Z"}