US2198323A - Amplifier - Google Patents

Amplifier Download PDF

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Publication number
US2198323A
US2198323A US118220A US11822036A US2198323A US 2198323 A US2198323 A US 2198323A US 118220 A US118220 A US 118220A US 11822036 A US11822036 A US 11822036A US 2198323 A US2198323 A US 2198323A
Authority
US
United States
Prior art keywords
grid
cathode
tube
current
discharge device
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 - Lifetime
Application number
US118220A
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English (en)
Inventor
Herbert M Wagner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RCA Corp
Original Assignee
RCA Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to BE425513D priority Critical patent/BE425513A/xx
Application filed by RCA Corp filed Critical RCA Corp
Priority to US118220A priority patent/US2198323A/en
Application granted granted Critical
Publication of US2198323A publication Critical patent/US2198323A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/22—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with tubes only
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/50—Amplifiers in which input is applied to, or output is derived from, an impedance common to input and output circuits of the amplifying element, e.g. cathode follower
    • H03F3/52—Amplifiers in which input is applied to, or output is derived from, an impedance common to input and output circuits of the amplifying element, e.g. cathode follower with tubes only

Definitions

  • My invention relates to electron discharge devices and circuits therefor particularly suitable for the amplification of audio frequency voltages andcurrents.
  • i i In one form of electron discharge device. referred to as a beam tube, there is provided a straight tubular cathode having emitting sections spaced along its surface so as to provide electron beams directed toward the anode suri rounding the cathode and an intermediate control grid, the wires of the grid being positioned opposite the non-emitting sections 01' the cathode.
  • the control electrode or control grid draws relatively small currents even though the control grid becomes positive with respect to the cathode,'substantially all of the current going to the anode in beams between the grid wires.
  • Such a tube is particularly usein] for amplification purposes and is capable of relatively large outputswith small distortion oi the kind usually due to grid current, which in the conventional type of tube causes considerable distortion. Notwithstanding the practically negligible grid current in this form of tube, when used in conventional circuits there is still a possibility of some distortion caused when very small currents flow to the grid and cause a. variable voltage drop in the grid circuit due to its impedance.
  • I make use of a low impedance input circuit and electrically couple this circuit to the input of a beam type of tube.
  • This provides a voltage source .or input circuit of low internal impedance for a beam tube having a low control grid current characteristic, the resulting combination providing an amplifier capable of delivering a high power output at very high efilciencies with practically no distortion.
  • FIG. 1 is shown one form of beam tube which can be used in my invention.
  • the envelope III is provided with the usual press II which supports the electrodes.
  • the cathode I2 is provided with a plurality of spaced emitting sections l3 along its length. These emitting portions may be formed as recesses to assist in the formation of beams, so that the electrons will pass between the grid wires of the control electrode IE to the anode IS, the grid wires being opposite the nonemitting sections of the cathode.
  • Rods I! are preferably secured to the cathode parallel to the grid side rods and mask the portion of the cathode opposite the grid side rods by splitting the beams and thus prevent the grid side rods from drawing current.
  • the grid current was 2.7 ma. and the plate current 93 ma.
  • the grid current was 56 ma. and the plate current 152 ma.
  • the grid current was about 3% of the anode current and in the second case about 37% 01' the anode current.
  • Comparison of the beam tube with other conventional tubes shows the same striking differences in grid current.
  • a tube of the beam type is particularly suitable for amplification purposes and far superior to the conventional type of tube, it is still subject to some distortion when used in conventional circuits.
  • Figure 21 show one preferred embodiment of my invention.
  • the envelope l0 of the beam tube contains the beam type cathode IS, the control grid l4 and anode it, which form the output section of the amplifying unit. Any form of tube which has the characteristic of drawing a negligible control grid current even though positively biased can be used however.
  • the input circuit for the tube includes the driver tube 20 provided with cathode 2
  • This cathode resistor provides the input circuit for the beam tube and has a comparatively small im-
  • the anode and cathode of the beam tube are connected to the output terminals 30 and 3
  • the cathode resistor 25 is of the order of 3000 ohms
  • the condenser 28 has a capacity of .5 microfarad
  • the resistor 29 a resistance of 9000 ohms.
  • an input circuit com prising the cathode circuit of the driver tub and having a comparatively low impedance 1 combined with a tube drawing a relatively smal grid current, the combined result being an am plii'ying unit or circuit arrangement in which th output may be of comparatively high power am yet at the same time provide a distortionless sig nal. That is, the input voltage swings will b truly and accurately reproduced in the outpu of the beam tube.
  • An amplifier including an electron discharg device having a cathode, a control grid and a1 anode, and means for forming a beam oi 'elec trons, said control grid lying outside the pat] of said beam, a second electron discharge devic including a cathode, grid and anode, a resisto in series with the cathode of said second elec tron discharge device, input terminals connect ed to the grid of the second electron discharg device and the end of said resistor remote from the cathode of the second electron discharge de vice, the grid of said first electron dlscharg device being capacitatively coupled to the oath ode of said second electron discharge device, am the cathode of said first electron discharge de vice being connected to the end of the resisto remote from the cathode of said second electroi discharge device, and output terminals connecteq to the anode and cathode oi said first electron discharge device.
  • An amplifier including an electron dischargi device having a cathode provided with means to forming beams of electrons, a grid, the wires 0 which lie outside the paths of the beams o electrons and an anode, a second electron dis charge device including a cathode, grid and an ode, a resistor in series with the cathode oi sail second electron discharge device, input termi' nals connected to the grid 01' the second electroi discharge device and the end of said resistor re mote from the cathode of the second electron discharge device, the grid oi said first electron dis charge device being capacitatively coupled to thi cathode of said second electron discharge device, and the cathode of said first electron discharge device being connected to the end of the resistor remote from the cathode of said second electron discharge device, and a resistor connected between the grid and cathode of said first electron discharge device, andoutput terminals connected to the anode and cathode of saidfirst electron discharge device.
  • An amplifier including an electron discharge device having a cathode, a grid and an anode, and the characteristicpf drawing a comparatively low grid current'when the grid is positively biased, a second electron discharge device including a cathode, grid and anode, a resistor in series with the cathode of said second electron discharge device, input terminals connected to the grid of the second electron discharge device and'the end of said resistor remote from the cathode [of the second electron discharge device,
  • the grid of said first electron discharge device being capacitively coupled to the cathode of said second electron discharge device, and the cathode of said first electron discharge device being connected to the end of the resistor remote from the cathode of said second electron discharge device, and output terminals connected to the anode and cathode of said first electron,

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
US118220A 1936-12-30 1936-12-30 Amplifier Expired - Lifetime US2198323A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BE425513D BE425513A (enrdf_load_stackoverflow) 1936-12-30
US118220A US2198323A (en) 1936-12-30 1936-12-30 Amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US118220A US2198323A (en) 1936-12-30 1936-12-30 Amplifier

Publications (1)

Publication Number Publication Date
US2198323A true US2198323A (en) 1940-04-23

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ID=22377238

Family Applications (1)

Application Number Title Priority Date Filing Date
US118220A Expired - Lifetime US2198323A (en) 1936-12-30 1936-12-30 Amplifier

Country Status (2)

Country Link
US (1) US2198323A (enrdf_load_stackoverflow)
BE (1) BE425513A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2471424A (en) * 1944-10-09 1949-05-31 Standard Telephones Cables Ltd Electron discharge device
US2488357A (en) * 1947-05-20 1949-11-15 Mcclatchy Broadeasting Company Negative feedback amplifying circuit
US2571650A (en) * 1947-11-07 1951-10-16 Rca Corp Peak-reading tuning indicator
US2679610A (en) * 1948-10-29 1954-05-25 Ericsson Telefon Ab L M Electron tube device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2471424A (en) * 1944-10-09 1949-05-31 Standard Telephones Cables Ltd Electron discharge device
US2488357A (en) * 1947-05-20 1949-11-15 Mcclatchy Broadeasting Company Negative feedback amplifying circuit
US2571650A (en) * 1947-11-07 1951-10-16 Rca Corp Peak-reading tuning indicator
US2679610A (en) * 1948-10-29 1954-05-25 Ericsson Telefon Ab L M Electron tube device

Also Published As

Publication number Publication date
BE425513A (enrdf_load_stackoverflow)

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