GB233737A - Improvements in and relating to electrical valve amplifiers - Google Patents
Improvements in and relating to electrical valve amplifiersInfo
- Publication number
- GB233737A GB233737A GB2876223A GB2876223A GB233737A GB 233737 A GB233737 A GB 233737A GB 2876223 A GB2876223 A GB 2876223A GB 2876223 A GB2876223 A GB 2876223A GB 233737 A GB233737 A GB 233737A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- grid
- frequency
- circuit
- plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/1607—Supply circuits
- H04B1/1623—Supply circuits using tubes
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/02—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with tubes only
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
233,737. Priess, W. H. Nov. 14, 1923. Thermionic amplifiers.-Relates to multi-valve amplifiers for the amplification of currents of radio or audio frequency in which the inter-valve couplings comprise transformers or choke coils, and consists in employing at the several stages couplings resonant ' to different frequencies, and combining therewith potentiometer control of the grid potentials, so as to vary the damping of the couplings, and consequently vary the sharpness of resonance. The object is to secure approximately equal amplification for a range of frequencies, thereby securing freedom from distortion in dealing with audio frequencies, and in the case of radio frequencies enabling a set to receive efficiently over a wide range of wave-lengths. Fig. 1 shows the application to a two-stage radio-frequency amplifier, the transformers A, B and the input circuit K, I being resonant at different frequencies. The grid potentials are adjusted by a potentiometer H shunted by condenser K<1>, and filament current is supplied from a transformer T. Condensers K<2>, K<3> and a resistance R are connected across the filament leads, and the grid circuits are connected to a point between the condensers and to a tapping on the resistance. The potentiometer for varying the grid potential may be connected across the filament battery, and mav have separate sliders H, H<1> for the several grid circuits. This arrangement is shown in Fig. 5, in which also the first high-frequency transformer A is replaced by an inductive or non-inductive resistance R in the plate circuit of the first valve and a resonant choke coil L<10> in the grid circuit of the second valve. The positions of the elements R, L<10> may be reversed. A condenser C<10> is connected between the plate of the first valve and the grid of the second. A crystal or like rectifier D, or a valve with grid leak, may be used as a detector, and the resulting low-frequency currents may be amplified by additional valves, or the radio-frequency valves may be utilized also for the amplification of the audio-frequency currents in the manner described in Specification 234,025. When two or more stages of audio-frequency amplification are employed, the resonance of the intervalve couplings is graduated. A reaction cricuit described in Specification 234,025 comprising an adjustable inductance, a resistance, and a capacity all in series may be connected between the plate of one high-frequency valve and the grid of an earlier valve; and a similar circuit may be connected between the plate of the detector valve and a variable tap on the grid coil of that valve. Electromagnetic reaction may also be employed from the plate circuit of the first valve to its input or aerial circuit. The filament rheostat may be employed for adjusting the grid potential of some or all of the valves in the manner described in Specification 234,024. The transformers are. preferably constructed as described in Specification 234,023.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB398025A GB232534A (en) | 1923-11-14 | 1923-11-14 | Improvements in and relating to electrical valve amplifiers |
Publications (1)
Publication Number | Publication Date |
---|---|
GB233737A true GB233737A (en) | 1925-05-14 |
Family
ID=9768510
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB398025A Expired GB232534A (en) | 1923-11-14 | 1923-11-14 | Improvements in and relating to electrical valve amplifiers |
GB2876223A Expired GB233737A (en) | 1923-11-14 | 1923-11-14 | Improvements in and relating to electrical valve amplifiers |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB398025A Expired GB232534A (en) | 1923-11-14 | 1923-11-14 | Improvements in and relating to electrical valve amplifiers |
Country Status (1)
Country | Link |
---|---|
GB (2) | GB232534A (en) |
-
1923
- 1923-11-14 GB GB398025A patent/GB232534A/en not_active Expired
- 1923-11-14 GB GB2876223A patent/GB233737A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB232534A (en) | 1925-04-14 |
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