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Summary

Long-tailed pair with cathode auto-biasing. Figure 3 from A. D. Blumlein's US Patent 2185367 (British 482740), priority from 1936-07-04. The original was slightly altered - I removed output cathode followers, which are not part of the LTP per se, and moved one of the interstage caps into the cropped area.

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patents patent drawings us patent office alan blumlein long tailed pair inventions
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Date

1936
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Source

USPTO
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Link

http://uspto.gov/
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patents patent drawings us patent office alan blumlein long tailed pair inventions