GB451207A - Improvements in or relating to low frequency thermionic amplifiers - Google Patents
Improvements in or relating to low frequency thermionic amplifiersInfo
- Publication number
- GB451207A GB451207A GB4434/36A GB443436A GB451207A GB 451207 A GB451207 A GB 451207A GB 4434/36 A GB4434/36 A GB 4434/36A GB 443436 A GB443436 A GB 443436A GB 451207 A GB451207 A GB 451207A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- resistance
- anode
- anode current
- derived
- 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
- H03G9/10—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers having discharge tubes for tone control and volume expansion or compression
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G7/00—Volume compression or expansion in amplifiers
- H03G7/02—Volume compression or expansion in amplifiers having discharge tubes
Landscapes
- Amplifiers (AREA)
Abstract
451,207. Valve amplifying circuits. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN, Emmasingel, Eindhoven, Holland. Feb. 13, 1936, No. 4434. Convention date, April 15, 1935. [Class 40 (v)] Volume expansion is effected in a low frequency amplifier 1, 3 by rectifying a portion of the output, derived from a potential divider 11, by a diode 8 and using the rectified voltage produced in resistance 9 to control the anode current of an auxiliary valve 2. This variable anode current passes through the anode resistance 4 of the amplifier 1 and operates to increase the anode voltage thereof when the signal amplitude increases. The anode current of valve 2 also passes through a pre-set portion of the cathode resistance 5 of valve 1 so that when the anode voltage of the latter rises its grid bias also becomes less negative. The cathode of valve 1 is connected to a tapping 18 on the resistance 5 so that the intensity of the contrast may be adjusted. A filter 17 may be provided to remove from the control energy high frequencies and in some cases high and low frequencies. In amplifiers having separate channels for different frequency bands, the control energy may be derived from one or more of said channels and applied to a plurality of rectifiers whose outputs are combined.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2150567X | 1935-04-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB451207A true GB451207A (en) | 1936-07-31 |
Family
ID=7987392
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4434/36A Expired GB451207A (en) | 1935-04-15 | 1936-02-13 | Improvements in or relating to low frequency thermionic amplifiers |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US2150567A (en) |
| AT (1) | AT150107B (en) |
| GB (1) | GB451207A (en) |
-
1936
- 1936-01-04 US US57548A patent/US2150567A/en not_active Expired - Lifetime
- 1936-02-13 GB GB4434/36A patent/GB451207A/en not_active Expired
- 1936-04-10 AT AT150107D patent/AT150107B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| US2150567A (en) | 1939-03-14 |
| AT150107B (en) | 1937-07-10 |
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