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Origin of the so-called "Blumlein Garter"
Origin of the so-called "Blumlein Garter"
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Old 11th October 2017, 06:24 PM   #21
leadbelly is offline leadbelly  Canada
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Shouldn't it be the Davis Garter for the earlier transformer coupled version?
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Old 11th October 2017, 06:38 PM   #22
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Origin of the so-called "Blumlein Garter"
Good point, as it dates back to 1940. I better edit the heading and my post above.
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Old 11th October 2017, 07:54 PM   #23
sser2 is offline sser2  United States
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Quote:
Originally Posted by DF96 View Post
What is the point of cross-coupled positive feedback in a bias circuit?
It maintains equal currents of the tubes, which is necessary if the PP pair is loaded with a transformer that does not allow unbalanced DC in the primary.
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Old 11th October 2017, 08:52 PM   #24
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Guys, could someone put the mentioned IT-version of the circuit here? can't find it
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Old 12th October 2017, 12:00 AM   #25
martyh is online now martyh  United States
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Quote:
Originally Posted by Shef View Post
Guys, could someone put the mentioned IT-version of the circuit here? can't find it
Second,that would be cool to see. Whoever originally came up with the idea, it works well for not much of a penalty.
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Old 12th October 2017, 12:49 AM   #26
sser2 is offline sser2  United States
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As posted on previous page of this thread, the link to the schematic is here:

ecc99 - 6C19n PP, (6S19P)

The only penalty for the garter (of whoever invention) is electrolytic capacitors bypassing cathode resistors. Without capacitors, there is positive feedback from cathodes to grids.
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Old 12th October 2017, 01:13 AM   #27
leadbelly is offline leadbelly  Canada
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Patent US2204578 - Transmission control system - Google Patents
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Old 12th October 2017, 02:45 AM   #28
sser2 is offline sser2  United States
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Mr. Davis actually doesn't claim the garter as means of equalizing standing currents in PP tubes. He claims the contraption that allows varying energy transmission via variable cancellation of the signal. The garter appears to be prior art.
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Old 12th October 2017, 04:32 AM   #29
leadbelly is offline leadbelly  Canada
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Don't agree with that interpretation. There are multiple claims where he discusses manipulating currents, in his words, and Fig 4 is expressly referenced as an amp application.
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Old 12th October 2017, 07:38 AM   #30
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Origin of the so-called "Blumlein Garter"
Also in Davis' patent, he did not site any prior art.
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