All of my hybrids use 50v or less. So I try to keep up with new filings.
This one from a few months ago.
It's good reading.
https://patentimages.storage.googleapis.com/5d/5a/2a/b59995e3aa3528/US10063194.pdf
This one from a few months ago.
It's good reading.
https://patentimages.storage.googleapis.com/5d/5a/2a/b59995e3aa3528/US10063194.pdf
Thanks for the head-up. This Ronald Quan patent filed in 2017 is related to a low voltage circuit it published on Linear Audio before. Explanation is unusually clear and full of data. I guess that a patent lawyer was not involved in the filing 
It contains plenty of useful data and ideas to build a tube preamplifier or headphone amplifier with a commercially available 48V power supply and cheap AA5 tubes. I wonder if anyone here has already built one of the original circuits described in Linear Audio; such as the one that on this patent is labeled fig.10.
A patent usually means that the idea will be commercialized. Does anyone know wich commercial amplifier, if any, actually uses this circuit?
It contains plenty of useful data and ideas to build a tube preamplifier or headphone amplifier with a commercially available 48V power supply and cheap AA5 tubes. I wonder if anyone here has already built one of the original circuits described in Linear Audio; such as the one that on this patent is labeled fig.10.
A patent usually means that the idea will be commercialized. Does anyone know wich commercial amplifier, if any, actually uses this circuit?
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Yes some of these are diodes but others use screen and or suppressor as increased anode area. Some old art mentions slow electrons?
I put this one up , a simple triode found accidentally by omitting a CC.
https://www.diyaudio.com/forums/analog-line-level/320015-doa-discrete-op-amps-8.html#post5690032
Any ideas on what is going with it?
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