Application for Windows PC

Get the “DCTriode” PC app, better than the Web site

I maintain an application “DCTriode” running on Windows, freely available for download and usage: more comfortable, more circuits, more tube models, more features than the Web version. You can edit and create your own models of triodes.

It includes 21 built-in models : ECC81, ECC82, ECC83, ECC85, ECC86, ECC88, ECC99, ECF80, ECF82, ECF83, ECF86, ECL80, ECL81, ECL82, ECL83, ECL84, ECL85, ECL 86, 12AY7 plus 300B and 2A3.

As simple to use as the online site, it nevertheless comes with a small PDF user manual. Pure freeware, fully functional, without any advertisements, telemetry, spy or intentional virus-like functions.

Download it freely now

Download from . Note that your browser may prevent you to download this MSI file, to “protect” you…

Last release #1.7 : November 16, 2022.

Next release 1.8 in December will include a few more circuits after John Broskie’s Tubecad web site: SRPP headphone amplifier, CCDA line amplifier, Janus cascode shunt regulator, Totem Pole Split Load Phase Splitter. Tubecad is a mine for circuits with DC couplings…

23 circuit solvers available:

  1. Basic gain stage, cathode bias
  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 (
  22. Cascode SRPP after phono preamp (
  23. Push-pull amplifier with DC feedback (

Why a Windows app in addition to the Web site ?

For sure one day I will shut down this Web site. Clever guys will have downloaded the PC app before ! On my side, it is also far easier to maintain and design when compared to the mix WordPress PHP JavaScript…

The library screen, where you list circuits and access related solvers:

Example of ECC82 long-tailed pair, with a grid differential voltage of -10V

Editing a model ECC86…

Displaying anode curves

Drawing transconductance, internal resistance and amplification factor of the ECL84 triode section, at 3 different anode voltages: