1. In 1901, Reginald Fessenden demonstrated a triode vacuum tube oscillator. 2. The DM160 is thus the smallest VFD and smallest triode valve. 3. It was the vacuum triode that made practical radio broadcasts a reality. 4. Several amateurs have experimented with the possibilities of using VFDs as triodes . 5. Valve preamplifiers use triodes or low-noise pentodes ( EF86 ). 6. Two triodes with the cathodes coupled together to form a differential pair. 7. The Barkhausen Kurz tube was a triode operated with the plate ). 8. The wide-band regenerative receiver used an RCA 955 acorn triode . 9. At fields around this point, the device operates similar to a triode . 10. A typical example, the 6AG11, contained two triodes and two diodes.
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