Surf Wiki
Save to docs
general/electronic-oscillators

From Surf Wiki (app.surf) — the open knowledge base

Tri-tet oscillator

Tri-tet oscillator

A tri-tet oscillator is a crystal-controlled vacuum tube electronic oscillator circuit. It is a type of electron-coupled oscillator (ECO), which uses a tetrode or pentode tube.

The tri-tet was introduced by James J. Lamb in the June 1933 issue of QST magazine.

In an ECO, the screen grid acts as a plate for the triode oscillator. Some of the electrons pass through the screen grid to the plate, causing a current to flow in the load. This effectively isolates the oscillator portion from the load, so that loading does not affect the operating frequency.

Tri-Tet oscillator schematic

In the schematic shown, the C1/L1 tank circuit control the current through the crystal. It is normally tuned a point between the crystal's fundamental frequency and its first harmonic.

The C2/L2 tank circuit is tuned to the desired harmonic.

D+ acts as the "plate" voltage for the tetrode, and is slightly less than B+.

References

References

  1. Lamb, James J. “A More Stable Crystal Oscillator of High Harmonic Output.” QST June 1933: 30-32.
  2. Sterling, George E. 1940. ''The Radio Manual for Engineers, Inspectors, Students, Operators and Radio Fans.'' 3rd ed. New York: D. Van Nostrand Company, Inc.
Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

electronic-oscillators 1933-introductions
Want to explore this topic further?

Ask Mako anything about Tri-tet oscillator — get instant answers, deeper analysis, and related topics.

Research with Mako

Free with your Surf account

Content sourced from Wikipedia, available under CC BY-SA 4.0.

This content may have been generated or modified by AI. CloudSurf Software LLC is not responsible for the accuracy, completeness, or reliability of AI-generated content. Always verify important information from primary sources.

Report