Application for Windows PC

Get the “DCTriode” free PC app, more complete and powerful than the Web site

I maintain a Windows PC application “DCTriode”, freely available for download and usage (freeware license): more comfortable, more circuits, more tube models, more features than the Web version. Pure freeware, fully functional, without any advertisements, telemetry, spy or intentional virus-like functions.

You may download its user manual to figure out what are its features or see some screen copies

Online libraryPC application
Circuits1038
TriodesECC81 ECC82 ECC83 ECC88Small signal: ECC81 ECC82 ECC83 ECC85 ECC86 ECC88 ECC99
ECF80 ECF82 ECF83 ECF86 ECL80
ECL81 ECL82 ECL83 ECL84 ECL85 ECL 86 12AY7
Power: 300B 2A3
Pentodes, tetrodesSmall signal: EF86
Power: EL34 EL84 6V6 5881 6550 KT66 KT88
Customise, create tube modelsnoyes
Display anode curvesbasicdetailed
Display µ gm rinoyes
Display DC datayesyes
Display stacked voltagesyesyes
Display DC loadlinenoyes
Display AC gain and impedancenoyes (not all solvers)
Display frequency responsenowith Miller effect and stray capacitances (not all solvers)
Single-ended power stagenoyes
Push-pull power stagenofall 2023
Store and retrieve your circuits configurationsnoyes
Store results for spreadsheetnoyes
Library visual interfacefixedflat / tree
PDF User Manualnoyes

Freeware license

DCTriode is a freeware: you may download and use it freely for an unlimited period of time. Meanwhile, you are not authorized to sell it. Its code remains proprietary.

Download it freely now

Download from https://tubes.astefo.com/install/dnld.php . Note that your browser may prevent you to download this MSI file, to “protect” you…

Last release #2.1 on September 03 2023

Available circuit solvers:

  1. Basic common cathode stage
  2. Phase inverter, self bias cathodyne
  3. Cathode follower, fixed bias
  4. Gain stage and DC-coupled cathode follower
  5. Phase inverter, fixed bias cathodyne
  6. Cascode
  7. Differential phase inverter, cathode bias
  8. Cascode SRPP
  9. Gain stages with direct coupling
  10. Differential phase inverter, constant current bias
  11. Dual triode mixer, balanced
  12. Dual triode mixer, asymmetrical
  13. Gain stage, constant current bias
  14. Gain stages with DC level shifting
  15. Differential phase inverter, long-tailed pair, cathode bias
  16. 2-triode serial voltage regulator
  17. 1-triode basic serial voltage regulator
  18. 1-triode shunt voltage regulator
  19. Three gain stages coupled by HV RC filters
  20. Two gain stages coupled by HV RC filters
  21. Double-cascode after “Aikido” circuit (tubecad.com)
  22. Cascode SRPP after phono preamp (tubecad.com)
  23. Push-pull amplifier with DC feedback (tubecad.com)
  24. SRPP headphone amplifier (after Tubecad.com)
  25. Basic current source
  26. Constant-Current-Draw-Amplifier (after Tubecad.com)
  27. Janus cascode shunt regulator (after Tubecad.com)
  28. Totem pole split load phase splitter (after Tubecad.com)
  29. Amplifier with AC local feedback anode to grid
  30. Mu-follower
  31. Cascode SRPP+
  32. Common-grid amplifier
  33. White cathode amplifier
  34. Half-mu stage
  35. Cathode-follower with current sink
  36. Pentode small-signal amplifier
  37. Single ended triode power stage
  38. Single ended tetrode / pentode power stage

See DCTriode screen copies