Tube input JFET output (TIJO) zero feedback audio amplifier
US6737915B1 · kind B1 · utility
6Cited by
4References
9Claims
0Family size
Inventor
Key dates
| Filing date | Nov 13, 2002 |
| Grant date | May 18, 2004 |
| Priority date | — |
| Expiry date | Nov 13, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F5/00
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A hybrid preamplifier with a vacuum tube input stage driving a JFET output stage dubbed TIJO (for Tube Input JFET Output) that uses zero feedback circuitry and a common low voltage B+ power supply. A single output low voltage transformer provides all necessary voltages including the filament voltage. No attempt is made to minimize distortion or maximize bandwidth by adding feedback. The vacuum tube is mounted externally to allow easy tube swapping for varying the gain and tonal palette, with no dangerous high voltages present.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.