Programmable controls for vacuum tube preamplifier
US5208548A · kind A · utility
7Cited by
2References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 8, 1992 |
| Grant date | May 4, 1993 |
| Priority date | — |
| Expiry date | May 8, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G3/001
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Light Dependent Resistors (LDR's) are used together with a differential amplifier and a plurality of reference resistors to replace conventional analog potentiometer controls and thus offer digital activation and programmability to a traditional style vacuum tube preamplifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.