• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Triode/Pentode Loadline Calculator

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#488
Sorry I haven't replied for a long time, but I haven't been checking my favorite Forum. The aforementioned websites (TRIODA.COM) are indeed not active now. I hope it's only temporary. I have forwarded their content to the newly established Trioda Association in Poland. They will be reactivated. The aforementioned online simulator will also be active again. There are probably no objections to the fact that if any of you colleagues have such an opportunity, I can pass on (with the Association's consent) the program code to be made available again to interested parties. In the meantime, I have made improvements to the program that allows generating Spice models based on measured tube parameters, which can be used in programs such as LTSpice. I am still checking this script. Its test version was once available on the www.trioda.com service. I will try to add it to the new version of the service run by the aforementioned Association.
 
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#494
On some forums (Reddid) there are comments about the poor accuracy of the program's calculations of some parameters 🙁. The accuracy at the "retro" level concerns primarily nonlinear distortions. It results from the fact that they are DELIBERATELY determined in the way it was done in the era of electron tubes, i.e. using geometric methods directly based on characteristics. I implemented in the script exactly the method of calculating individual harmonics as it was done using a ruler and a setsquare in the old days. Hence, on some forums I was accused of the fact that the accuracy of the simulator's calculations is insufficient (and this is the case in the era of computers - I could finally implement an exact algorithm for calculating distortions and other parameters). But I am a fan not only of electron tubes, tube circuits, but also of the methods of designing electronic circuits used in the era of electron tubes, for which I apologize in advance to those disappointed by the program's imperfections.
 
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#496
Hi gsmok, nothing is perfect. For the example, there are so many different types of 300B tubes in the market. Their characteristic varies from one to the other. There's no way keeping update for every one of them.

We all appreciate in your efforts in working on the program so that we could have a tool finding the best working condition of the tubes.

Johnny
 
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