The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 18, 2004
Filed:
Nov. 13, 2002
Applicant:
Inventor:
Stephen Arthur Harner, Frisco, TX (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03F 5/00 ; H03F 2/100 ;
U.S. Cl.
CPC ...
H03F 5/00 ; H03F 2/100 ;
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.