GB630986A - Improvements in and relating to thermionic valve amplifiers - Google Patents
Improvements in and relating to thermionic valve amplifiersInfo
- Publication number
- GB630986A GB630986A GB3577546A GB3577546A GB630986A GB 630986 A GB630986 A GB 630986A GB 3577546 A GB3577546 A GB 3577546A GB 3577546 A GB3577546 A GB 3577546A GB 630986 A GB630986 A GB 630986A
- Authority
- GB
- United Kingdom
- Prior art keywords
- resistor
- amplifier
- volume control
- gain
- feed
- 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
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G9/00—Combinations of two or more types of control, e.g. gain control and tone control
- H03G9/02—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers
- H03G9/04—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers having discharge tubes
- H03G9/06—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers having discharge tubes for gain control and tone control
- H03G9/08—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers having discharge tubes for gain control and tone control incorporating negative feedback
Landscapes
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
- Control Of Amplification And Gain Control (AREA)
Abstract
630,986. Valve amplifying circuits. BUSH RADIO, Ltd., and HARRISON, W. H. Dec. 3, 1946, No. 35775. [Class 40 (vi)] In a low-frequency amplifier, maximum negative feed-back is produced. at the minimum gain setting of the gain control resistor by connecting the tapping point of the resistor to the input of a first amplifying stage and connecting the end of the resistor corresponding to minimum gain to a point upon a cathode bias resistor in a succeeding stage, the voltage at this point being opposite in phase to that at the input of the first amplifier. The Figure shows the detector and L.F. amplifier stages of a superheterodyne receiver in which maximum negative feed-back is applied at low gain settings of the volume control. Signals from the I.F. stages are detected and the resulting L.F. signals appear across the diode load resistor R1 and are applied to the grid of the triode amplifier V1 via the volume control potentiometer VR 1. The lower end of this potentiometer is returned to earth via the cathode resistor R5 across which there is a negative feed-back voltage from the power amplifier stage V2. As the tapping 12 of the volume control VR1 moves towards the low gain position the negative feed-back voltage increases and thus when the receiver is used on relatively strong local signals the maximum amount of negative feed-back is available to correct for the attenuation of the higher audio frequencies which would otherwise occur. Capacitor C5, which acts as a shunt to the feed-back voltage at the higher frequencies has its maximum effect at low gain settings of the volume control so that at low levels of gain the higher frequencies are amplified to a relatively greater extent than the remainder of the frequency range. The amplifier may be made to simulate the frequencyresponse of the human ear by including a network, Fig. 2 (not shown), in the feed-back path at 17 so that the amplification of the higher and lower audio frequencies is respectively greater than that of the mid-band frequencies at low gain settings of the volume control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3577546A GB630986A (en) | 1946-12-03 | 1946-12-03 | Improvements in and relating to thermionic valve amplifiers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3577546A GB630986A (en) | 1946-12-03 | 1946-12-03 | Improvements in and relating to thermionic valve amplifiers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB630986A true GB630986A (en) | 1949-10-25 |
Family
ID=10381423
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3577546A Expired GB630986A (en) | 1946-12-03 | 1946-12-03 | Improvements in and relating to thermionic valve amplifiers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB630986A (en) |
-
1946
- 1946-12-03 GB GB3577546A patent/GB630986A/en not_active Expired
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