Although Steps draws graphs, it doesn't export them. It only exports in CSV or text.
I'll see if I can make a graph using Excel and send it here.
screen shot. use the prtsc key beside F12. Hit alt-prtsc if you just want a shot of the window and not the entire screen.
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Oh it's far too late. I took the measurements yesterday.
I have made the crude graphs.
I can retake the measurements if you need a clearer graph, but it will take like 10 mins each.
I have attached them down below.
View attachment magn-dist(no feedback).pdf
View attachment magn-dist(with a 500R negative feedback resistor).pdf
View attachment magn-dist(with a 2K negative feedback resistor).pdf
Always save measurements in a form that it clear at least to you, and under which conditions it was done.. A week from now you don't remember what the f... you did a week ago;-)
Then you need to do it again to check. And again ...
Jan
Then you need to do it again to check. And again ...
Jan
I know right? xD
I will try to redo the test, 3 times, and I'll send the screenshots.
Oh I forgot to say that there was an 8.2Ohm resistor across the output transformer.
OK umm... I'm running the tests now and without any negative feedback, it's looking pretty clean :|
I really don't know what's going on.
Although, I suspect that it was because of my sound card. It has a bit of distortion after a certain volume and I think it was at 12% last time and now it's at 8% (which I discovered yesterday after those tests that it has almost 0% distortion at 8% volume).
I really don't know what's going on.
Although, I suspect that it was because of my sound card. It has a bit of distortion after a certain volume and I think it was at 12% last time and now it's at 8% (which I discovered yesterday after those tests that it has almost 0% distortion at 8% volume).
AbaddonD, what circuit are you using? We went thru a number of iterations. Anyway … I wish you well. -= GoatGuy ✓ =-
The latest one with only one 6AQ5 in circuit.
I have attached 4 pictures below.
It seems a lot cleaner. I think the previous tests had a lot of distortion from the input. Now that it has clean signal coming in, it also has clean signal coming out. I forgot to take pictures of the distortion graph, but on the last one (500R) the THD seems oddly high at about 55% average but I think it's wrong or something. The D2 seems more reasonable though at a max of 3.03% at 30.0Hz and it's least D2 at 51.3Hz at 0.06%.
Also, I think that spike on the first graph is an error or something.
Yes, I have. Both with my high efficiency speakers and a pair of mid-range and super high-end headphones and it sounds very good on all of them. Just at high input audio voltages, it starts clipping at low frequencies. It's a bit annoying.
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