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It isn't too bad. Can anyone copy, enlarge, and post a clarified version?
Wow nice amp, what rectifier are you using?Hard to see a so perfect square wave.
Larger is here: http://www.audiocircle.com/index.php?action=gallery;area=browse;image=170805;size=huge
Thanks for posting the enlargement. Much easier on my old eyes!Actually, getting a decent 320 Hz square wave in a budget design isn't all that easy, particularly when using limited bandwidth output xfmrs. Had the person who requested this design wanted to spend more the amp would have been done in a very different way. But, for what these cost, their performance is very remarkable and will provide a wonderful intro to "tube sound" for someone who is curious. But, my mind is always open to suggestions about how to improve things, although in this case it would have to keep the budget the same.
I suspect 6LR8 may be a great tube to driver position.Interesting tube, how much power do can get in SEP?Any reason you choose this tube?
Two small comments on the schematic: 1] The AC power Safety Ground/Protective Earth should use a different ground symbol and be connected to the chassis at one point near where the power cord enters the chassis.2] The circuit and DC supply grounds should be connected together at one point near the input jacks.
You should check some expert's viewpoint.The experts like:Neil Muncy (RIP)Henry OttJim BrownKeith Armstrong
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