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OT primary impedance for 6K6s
OT primary impedance for 6K6s
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Old 12th February 2020, 03:27 AM   #21
kodabmx is offline kodabmx  Canada
Spreading triode love.
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OT primary impedance for 6K6s
The actual patent: Patent Images

I now want to play with idea.
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Old 12th February 2020, 04:49 PM   #22
Tubelab_com is offline Tubelab_com  United States
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Stick a transistor in place of the 12AU7 and you can patent it again!

But when you make the amplifier that's offered for sale (The Berning EA-230) you use a 6SN7.

Tube amplifiers for high-end audio by The David Berning Company
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File Type: pdf Patent#3995226.pdf (35.0 KB, 16 views)
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Tubelab, it's 5 year mission. To explore strange new tubes, to seek out new circuits and topologies, to boldly go where no tube has gone before......
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Old 13th February 2020, 10:05 AM   #23
6A3sUMMER is offline 6A3sUMMER  United States
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One old rule at the patent office:

If a new patent application presents a "new" product, and that "new" product idea is obvious to someone 'well versed in the art', the "new" product was not patentable.

Either the patent office no longer has people 'well versed in the art', or they have changed the rule.
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Old 13th February 2020, 03:07 PM   #24
jhstewart9 is offline jhstewart9  Canada
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It is said that Einstein was not a great student.
But he was trained at the patent office. And great things happened.
That tells us something but not sure what.
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Old 14th February 2020, 05:55 AM   #25
PRR is offline PRR  United States
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> they have changed the rule.

Not explicitly. But if it is not drop-dead a copy-cat, the inclination is to demand the full patent fee, issue the paper, and let the lawyers argue it out when infringement is claimed.
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Old 14th February 2020, 07:55 AM   #26
6A3sUMMER is offline 6A3sUMMER  United States
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I guess that Einstein was trained by people who were well versed in the art.

No more Einsteins coming out of the patent office.
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