GB745095A - Improvements in electric apparatus for reproducing sound from a sound record - Google Patents
Improvements in electric apparatus for reproducing sound from a sound recordInfo
- Publication number
- GB745095A GB745095A GB23912/53A GB2391253A GB745095A GB 745095 A GB745095 A GB 745095A GB 23912/53 A GB23912/53 A GB 23912/53A GB 2391253 A GB2391253 A GB 2391253A GB 745095 A GB745095 A GB 745095A
- Authority
- GB
- United Kingdom
- Prior art keywords
- record
- winding
- sound
- supply
- pick
- 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
- 238000004804 winding Methods 0.000 abstract 6
- 238000010079 rubber tapping Methods 0.000 abstract 2
- 239000013078 crystal Substances 0.000 abstract 1
- 239000004575 stone Substances 0.000 abstract 1
- 238000010792 warming Methods 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B3/00—Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/181—Low-frequency amplifiers, e.g. audio preamplifiers
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Power Engineering (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Abstract
745,095. Sound recording apparatus. STONE, L. Nov. 24, 1954 [Aug. 29, 1953], No. 23912/53. Class 40(2) The amplifier electric power supply, or part thereof, is derived from, or through, one or more windings 27 of a motor 13 of an apparatus for reproducing sound from a sound record, e.g., a gramophone record disc or a magnetic tape record; the apparatus comprises a record carrier, e.g. a gramophone record disc turntable 12 or a magnetic tape record spool arrangement, the electric motor 13 for driving the record carrier, a pick-up, e.g., a stylus operated pick-up 15 for co-operating with a gramophone record disc or an electromagnetic transducer head for co-operating with a magnetic tape record, and an electric amplifier 17 for amplifying the signal produced by the pick-up. As shown applied to a gramophone unit, the cathodes or cathode heaters 32, 33 of amplifier valves 18, 19 take their L.T. supply from between one end 28 and a tapping 38 of the motor winding 27 while the amplified H.T. supply is taken from between tapping 38 and the other end 39 of the winding, said winding acting as an autotransformer. In other embodiments the H.T. supply is taken from the A.C. supply leads 25, the cathode heaters together with that of an additional valve are serially connected across a part of the winding, or the cathode heaters are serially connected with the winding which then constitutes a voltage dropping impedance. To avoid the turntable turning continuously between records or the delay of the cathodes warming up, the invention provides means for declutching the turntable from the motor at positions of a, speed control knob 16 intermediate 33, 45 and 78 r.p.m. positions. The unit may be part of a television or sound radio receiver and connected to a common loudspeaker. The pick-up may be of the piezo-electric crystal or of the magnetic type and if of low output a pre-amplifier may be employed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB23912/53A GB745095A (en) | 1953-08-29 | 1953-08-29 | Improvements in electric apparatus for reproducing sound from a sound record |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB23912/53A GB745095A (en) | 1953-08-29 | 1953-08-29 | Improvements in electric apparatus for reproducing sound from a sound record |
Publications (1)
Publication Number | Publication Date |
---|---|
GB745095A true GB745095A (en) | 1956-02-22 |
Family
ID=10203312
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB23912/53A Expired GB745095A (en) | 1953-08-29 | 1953-08-29 | Improvements in electric apparatus for reproducing sound from a sound record |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB745095A (en) |
-
1953
- 1953-08-29 GB GB23912/53A patent/GB745095A/en not_active Expired
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