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Hello there! Just a quick update: I finally had some time to fix the amp. I've taken some measurements and modified the circuit so that now all the hum is gone and the efficiency is also a tiny bit better. Altogether now I call it finished. Here's the new schematic with measurements for those who are interested. Have a nice day ;)
Cheap DIY Front Panels
That looks so beautiful! Great job!
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Wolf of the Wilderness
Thank you! I really appreciate it!
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I've been thinking about measuring the current but I haven't done that yet. At it's output, aka pin 3, I'm getting around 300V when under load. I am using an EZ80 tube. I have an EZ81 as well but that one isn't in too good shape, that's why I decided to use the lower power one. Right now I'm working on another project, after that is done I'll focus more on this one. My plan is to rebuild it to fix it's issues and take some measurements so I can give more technical details about it.
You are totally right. That tube is rated for way less current than what I'm using it for. But I haven't yet noticed any problems with it so I guess it's fine.
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