US2538663A - Variable mutual conductance amplifier - Google Patents
Variable mutual conductance amplifier Download PDFInfo
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- US2538663A US2538663A US685187A US68518746A US2538663A US 2538663 A US2538663 A US 2538663A US 685187 A US685187 A US 685187A US 68518746 A US68518746 A US 68518746A US 2538663 A US2538663 A US 2538663A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G1/00—Details of arrangements for controlling amplification
- H03G1/0005—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal
- H03G1/0011—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal the device being at least one of the amplifying tubes of the amplifier
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- This circuit ar'r'angemer t'has the characteristicthat uselis'made of discharge paths, of which one has; a comparatively high average mutual conductance and a comparatively small grid space and the other'on theecontrary has a comparatively .loW mutual conductance and a comparatively large grid space, provision being made of means which automatically ensure that the amplificatiorigin thecase of small amplitudes of the loscillations to be amplified; is efiected solely, ,or practically s les.
- auxiliary electrode In'- one form of construction of the circuit-alfrangement described in detaiLthe said auxiliary electrodeis'connected, via a. resistance, to: the interconnected anodes of the two" discharge paths, whilst the common anode circuit of'these paths includes a resistance, preferably high, which is proportioned in'such manner that inthe case of sma ll amplitudes. of the oscillations. to be amplified the discharge path including; the auxiliary electrode is blocked.
- the invention provides an'. improvement of this circuit-arrangement by which the rnagrimumam plification obtainable is raised;
- the invention is based on, the recognition of the fact that the saidresistance interposed between the auxiliary electrode and the anodes reduces the anode 'ime ped cce. nd co q e y .t el nlifi at onone discharge tube I.
- the auxiliary'electrode' connected to an electrode placed in the discharge path having'the comparatively'high average mutual conductance and. extending through a comparatively small part of this'discharge ,path.
- Apositive voltage is applied to the, auxiliary electrode through a preferably high resistance; the said electrode and the said resistance being proportioned in such manner that in the case of comparatively .smallamplitudes" of the" oscillations to be amplified the discharge path "comprising the "auxiliary electrode is blocked completely or almost completely;
- the auxiliary electrode is preferably con nected direct'to the aforesaid electrode. order that 'the'inve tion may beflclea'rly understood and readily carried into effect it"will now be. set out more ful-lyfl w ith'referenc e to the accompanying drawings 'In, the drawingzf Fig. '1 is ,a'schematic diagram of a circuit in accordance with the invention, and
- Fig. 2 is a cross-sectional view of the tube included in the circuit of Fig. 1.
- the drawing illustrates a circuit-arrangement for the amplification of low-frequency oscilla tions, in which use is "made of two.
- the aforesaid auxiliary electrode is iormed by parts 3' of the screen grid.
- 'Ihedischarge path A which "comprisesth is auxiliary electrode, is controlled by a part ofthe control grid which is realized with an uneven winding pitch.
- the part of the control grid"located-in theother discharge path is WOllIltT'Wlth a constant pitch. .
- the twocontrol-grid'parts are e'lec-- tricallythrough-connected.
- the suppressor grid 4 the anode 5 and the cathode 6' serve'at thesametime'for both the discharge paths.”
- the screen-grid part 3 is connected; via a potentiometer constitutedby two resistances '1 and 8, to the positive terminal of a supply of direct current voltage (not shown) anjdfviaa condenser 9, to the-cathode 6.
- an electrode is located in the discharge path B," that is the discharge path having the comparatively high average mutual. conductance and the corn-parad tiyelyjsmall grid space.
- This tube comprises 'a
- the auxiliary electrode 3 is connected, through a high resistance ill, to the positive terminal of a direct-current voltage supply (not shown).
- the electrode l4 and the resistance are proportioned in such manner that in the case of comparatively small amplitudes of the oscillations to be amplified the discharge path A is blocked completely or almost completely.
- the auxiliary electrode 3' is connected to the cathode 6 via a condenser H.
- the anode circuit includes a comparatively high resistance 12.
- the value of resistance i0 is, as a rule, higher than that of resistance l2.
- the low-frequency oscillations to be amplified are supplied, together with a control-voltage varying with the amplitude of these oscillations,
- the amplified oscillations can be taken from resistance i2 through a condenser l3.
- the circuit-arrangement operates in a manner similar to that of the patent application, heretofore mentioned, i. e. a high maximum noiseless amplification (at a low anode current) when the amplitude of the oscillations to be amplified is comparatively small, and an amplification that is very well adjustable when this amplitude is comparatively large.
- the high maximum amplification is obtained by means of the discharge path B which comprises the screen-grid part 3, whereas the adjustable amplification is brought about by means of the discharge path A in which the auxiliary electrode 3' is located.
- the right-hand discharge path In the case of a large amplitude of the oscillations to be amplified, hence at a high negative value of the control voltage, the right-hand discharge path is blocked by the control voltage supplied to the control-grid 2, whereas the lefthand discharge path keeps operative. In the case of a small amplitude of the oscillations to be amplified, hence at a small negative value of the control voltage, the right-hand discharge path keeps operative, Whereas the left-hand discharge path is blocked completely or almost completely.
- auxiliary electrode 3 with an extension which extends through a comparatively small part of the discharge path B.
- the auxiliary electrode 3' and the screen grid 3 can, for example, be wound coaxially, the winding of the auxiliary electrode 3', being continued to such an extent that this electrode overlaps a small part of screen grid 3.
- An amplifying circuit arrangement comprising, first and second thermionic discharge paths enclosed in an evacuated envelope, said paths being connected in parallel relation and havin cathodes and anodes connected in common, the first thermionic discharge path having further a control grid electrode with given spacing between cathode and anode and given mutual conductance and a screen grid electrode, the second thermionic discharge path having further a control grid electrode with larger spacing between cathode and anode and lower mutual conductance than that of the first thermionic discharge path and an auxiliary electrode between the control grid and anode of the second thermionic discharge path, a source of desired signals, means to couple said source to the cathodecontrol grid circuits of the said first and second discharge paths, an electrode inserted between the screen grid and anode of the first thermionic discharge path, and means to couple said latter electrode to the auxiliary electrode whereby the second discharge path is blocked upon the source of desired signals reaching in magnitude a predetermined level.
- An amplifying circuit arrangement comprising, first and second thermionic discharge paths enclosed in an evacuated envelope, said paths being connected in parallel relation and havin cathodes and anodes connected in common, the first thermionic discharge path having further a control grid electrode with given spacing between cathode and anode and given mutual conductance and a screen grid electrode, the second thermionic discharge path having further a control grid electrode with larger spacing between cathode and anode and lower mutual conductance than that of the first thermionic discharge path and an auxiliary electrode between the control grid and anode of the second thermionic discharge path, a source of desired signals, means to couple said source to the cathodecontrol grid circuits of the said first and second discharge paths, a resistive element, means to apply a source of direct current potential to said auxiliary electrode through said resistive element, and an electrode inserted between the screen grid and anode of the first thermionic discharge path, said latter electrode connected to the auxiliary electrode whereby the second discharge path is blocked upon the source of
- An amplifying circuit arrangement comprising, first and second thermionic discharge paths enclosed in an evacuated envelope, said paths being connected in parallel relation and having cathodes and anodes connected in common, the first thermionic discharge path having further a control grid electrode with given spacing between cathode and anode and given mutual conductance and a screen grid electrode, the
- An amplifying circuit arrangement comprising? first and second thermionic discharge ipaths enclosed in an evacuated': envelope said :"paths being connectedjn parallel relati ing between cathode and anode and given mutual conductance and a screen grid electrode, the second thermionic discharge path having further a control grid electrode with larger spacing between cathode and anode and lower mutual conductance than that of the first thermionic discharge path and an auxiliary electrode between the control grid and anode of the second thermionic discharge path, a source of desired signals, means to couple said source to the cathodecontrol grid circuits of the said first and second discharge paths, a resistive element, means to :apply a source :auxiliary electrode through said resistive element, :and an extension of the said auxiliary electrode of direct current potential to said inserted between the screen grid and anode in the :first thermionic discharge path whereby the second discharge path is blocked upon the source of desired signals reaching in magnitude a predetermined level.
- An amplifying circuit arrangement comprising, first and second thermionic discharge paths enclosed in an evacuated envelope, said paths being connected in parallel relation and havin cathodes and anodes connected in common, the first thermionic discharge path having further a control grid electrode with given spacing between cathode and anode and given mutual conductance, the second thermionic discharge path having further a control grid electrode with larger spacing between cathode and anode and lower mutual conductance than that of the said first thermionic discharge path and a screen grid electrode comprising of two parts insulated electrically from each other and inserted respectively in the first and second thermionic discharge paths, a source of desired signals, means to couple said source to the cathode control grid circuits of the said first and second discharge paths, a resistive element, means to apply a source of direct current potential to said auxiliary electrode through said resistive element, and an electrode between the screen grid and anode in the first thermionic discharge path, said latter electrode connected to the screen grid electrode in the second discharge path whereby the
- An amplifying circuit arrangement comprising, first and second thermionic discharge 'paths enclosed in an evacuated envelope, said ;paths being connected in parallel relation and cans to pf a'rod inrid andanode in the and an electnode l l and a o, e of the. fir ,the mion fiiseha l said latter electrode eonnected t' i the' a c e eby-the seco d d hais t oel ed-.-,upon lthe-.source of, desiredsignals reacting in magnitude apr'edetermined level.
- An amplifying circuit arrangement comprising, first and second thermionic dischargepaths enclosed in an evacuated envelope, saidl paths being connected in parallel relation and. having a common cathode and common anode, the first thermionic discharge path having: further a control grid electrode with given spacing between cathode and anode and given mutual conductance and a screen grid electrode, the second thermionic discharge path having further a control grid electrode with larger spacing between cathode and anode and lower mutual conductance than that of the first thermionic discharge path and an auxiliary electrode between the control grid and anode of the second thermionic discharge path, a source of desired signals, means to couple said source to the cathodecontrol grid circuits of the said first and second discharge paths, a resistive element, means to apply a source of direct current potential to said auxiliary electrode through said resistive element,
- An amplifying circuit arrangement comprising, first and second thermionic discharge paths enclosed in an evacuated envelope, said paths being connected in parallel relation and having a common cathode and common anode, the first thermionic discharge path having further a control grid electrode with given spacing between cathode and anode and given mu-- tual conductance and a screen grid electrode, the second thermionic discharge path having further a control grid electrode with larger spacing between cathode and anode and lower mutual conductance than that of the first thermionic discharge path and an auxiliary electrode between the control grid and anode of the second thermionic discharge path, a source of desired signals, means to couple said source to the cathodecontrol grid circuits of the said first and second discharge paths, a resistive element, means to apply a source of direct current potential to said auxiliary electrode through said resistive element, and an extension of the said auxiliary electrode inserted between the screen grid and anode of the first thermionic discharge path, said latter electrode connected to the auxiliary electrode where
- An amplifying circuit arrangement comprising, first and second thermionic discharge paths enclosed in an evacuated envelope, said paths being connected in parallel relation and having a common cathode and common anode, the first thermionic discharge path having further a control grid electrode with given spacing between cathode and anode and given mutual conductance and a screen grid electrode, the second thermionic discharge path having further a control grid electrode with larger spacing between cathode and anode and lower mutual conductance than that of the first thermionic discharge path and an auxiliary electrode wound coaxially with the screen grid electrode in the first discharge path and between the control grid and anode of the second thermionic discharge path, a source of desired signals, means to couple said source to the cathode-control grid circuits of the said first and second discharge paths, a resistive element, means to apply a source of direct current potential to said auxiliary electrode through said resistive element, and an extension of the said coaxially wound auxiliary electrode inserted in the first thermionic discharge path whereby the second
Description
Jan. 16, 1951 G. H. P. ALMA 2,538,663
VARIABLE MUTUAL CONDUCTANCE AMPLIFIER Filed July 20, 1946 Patented Jan. 16, 1951 UNITED STATES;
: ATENT" mos VARIABLE MUTUAL GONDUCTANCE AMELIFIEB Gerrit- Hendrik Tetrus Alma, EindhoyemNethenlands, assignor to ."HartfordNational Bank and Trust Company, Hartford, Conn, as trustee 9 Claims. (01. 179 -171) In the copending patent application, U. S., Se rial No. 683,710, how.. Paten't QNo. 2,5 30,59 11,' i s.-V. sued November. 21,1950, there is describedacirwit-arrangement. for the amplification ofi el'ectrical oscillationsby means of at least two, paral. lel- -connected discharge paths, controlledjby con trolgrids, having characteristic'l curves the, slopes of which vary differently asa functionoi the control-grid voltage. This circuit ar'r'angemer t'has the characteristicthat uselis'made of discharge paths, of which one has; a comparatively high average mutual conductance and a comparatively small grid space and the other'on theecontrary has a comparatively .loW mutual conductance and a comparatively large grid space, provision being made of means which automatically ensure that the amplificatiorigin thecase of small amplitudes of the loscillations to be amplified; is efiected solely, ,or practically s les. b m ntof, the first-m n ned disch r e path. and'in the case of large amplitude'sqof; these oscillations, solely or practically solely bymeans ofithela t-mentioned path."
The automatic change-over from, one, dise hareepatht he. h r can e fe ti ly. be B1 sures by p yin t the ontrol rids 'a con r l voltage varying withjthe amplitude'of' the 'oscillations to be amplified, which voltage blocks the first-mentioned discharge path with comparatively high values of the oscillations to be amplified and which infiuencesat the same time the potential of an auxiliary electrode located in the last-mentioned discharge path (that-"is the path having the comparatively-small average mutuallconductarice and the comparatively large grid space),in suchmannerthat this path is blocked in the case of" comparatively lowvalues of the oscillations to be amplified. In'- one form of construction of the circuit-alfrangement described in detaiLthe said auxiliary electrodeis'connected, via a. resistance, to: the interconnected anodes of the two" discharge paths, whilst the common anode circuit of'these paths includes a resistance, preferably high, which is proportioned in'such manner that inthe case of sma ll amplitudes. of the oscillations. to be amplified the discharge path including; the auxiliary electrode is blocked.
The invention provides an'. improvement of this circuit-arrangement by which the rnagrimumam plification obtainable is raised; The invention is based on, the recognition of the fact that the saidresistance interposed between the auxiliary electrode and the anodes reduces the anode 'ime ped cce. nd co q e y .t el nlifi at onone discharge tube I.
2 l According to the invention the auxiliary'electrode' connected to an electrode placed in the discharge path having'the comparatively'high average mutual conductance and. extending through a comparatively small part of this'discharge ,path. Apositive voltage is applied to the, auxiliary electrode through a preferably high resistance; the said electrode and the said resistance being proportioned in such manner that in the case of comparatively .smallamplitudes" of the" oscillations to be amplified the discharge path "comprising the "auxiliary electrode is blocked completely or almost completely;
The auxiliary electrode is preferably con nected direct'to the aforesaid electrode. order that 'the'inve tion may beflclea'rly understood and readily carried into effect it"will now be. set out more ful-lyfl w ith'referenc e to the accompanying drawings 'In, the drawingzf Fig. '1 is ,a'schematic diagram of a circuit in accordance with the invention, and
Fig. 2 is a cross-sectional view of the tube included in the circuit of Fig. 1.
The drawing illustrates a circuit-arrangement for the amplification of low-frequency oscilla tions, in which use is "made of two. "discharge paths (A and B); .both'of whichfare housed in control gri'djZja screen grid consisting of two parts 3 and 3",v a suppressor grid 4, an'anodeli, and a ca hOde'B Which is connected to suppressor grid'll. The aforesaid auxiliary electrode is iormed by parts 3' of the screen grid. 'Ihedischarge path A. which "comprisesth is auxiliary electrode, is controlled by a part ofthe control grid which is realized with an uneven winding pitch. The part of the control grid"located-in theother discharge path is WOllIltT'Wlth a constant pitch. .The twocontrol-grid'parts are e'lec-- tricallythrough-connected. The suppressor grid 4,"the anode 5 and the cathode 6' serve'at thesametime'for both the discharge paths."
The screen-grid part 3 is connected; via a potentiometer constitutedby two resistances '1 and 8, to the positive terminal of a supply of direct current voltage (not shown) anjdfviaa condenser 9, to the-cathode 6.
According to the invention'an electrode is located in the discharge path B," that is the discharge path having the comparatively high average mutual. conductance and the corn-parad tiyelyjsmall grid space. The said electrode,
which is preferablyformed in the shape-Ora rod, extends througha lcomparatively'small partfof This tube comprises 'a,
the discharge path B and is connected direct to the auxiliary electrode 3'. The potential of this electrode has little or not influence on the current flowing in the discharge path B. The auxiliary electrode 3 is connected, through a high resistance ill, to the positive terminal of a direct-current voltage supply (not shown). The electrode l4 and the resistance are proportioned in such manner that in the case of comparatively small amplitudes of the oscillations to be amplified the discharge path A is blocked completely or almost completely. The auxiliary electrode 3' is connected to the cathode 6 via a condenser H. The anode circuit includes a comparatively high resistance 12. The value of resistance i0 is, as a rule, higher than that of resistance l2.
The low-frequency oscillations to be amplified are supplied, together with a control-voltage varying with the amplitude of these oscillations,
to the control grid 2. The amplified oscillations can be taken from resistance i2 through a condenser l3.
The circuit-arrangement operates in a manner similar to that of the patent application, heretofore mentioned, i. e. a high maximum noiseless amplification (at a low anode current) when the amplitude of the oscillations to be amplified is comparatively small, and an amplification that is very well adjustable when this amplitude is comparatively large. The high maximum amplification is obtained by means of the discharge path B which comprises the screen-grid part 3, whereas the adjustable amplification is brought about by means of the discharge path A in which the auxiliary electrode 3' is located.
In this case, however, the automatic changeover from one discharge path to the other is effected in a manner different from that in the aforesaid form of the arrangement described in the patent application, heretofore mentioned.
In the case of a large amplitude of the oscillations to be amplified, hence at a high negative value of the control voltage, the right-hand discharge path is blocked by the control voltage supplied to the control-grid 2, whereas the lefthand discharge path keeps operative. In the case of a small amplitude of the oscillations to be amplified, hence at a small negative value of the control voltage, the right-hand discharge path keeps operative, Whereas the left-hand discharge path is blocked completely or almost completely.
This blocking takes place as follows: In the case of a decrease of the negative value of the control voltage the current of the right-hand discharge path increases. From this current a small portion is derived by the electrode 14. This portion flows through resistance It to the cathode and consequently brings about at this resistance a voltage drop. The electrode (4 and the resistance lil are proportioned in such manner that the voltage drop is so high that the voltage of the auxiliary electrode falls below the minimum value required to maintain the discharge current, so that the left-hand discharge path is blocked completel or almost completely. In this case the discharge path A consequently contributes to the amplification no longer or substantially no longer. I The present circuit-arrangement has the advantage over the form of the arrangement described in the main patent specification, heretofore mentioned, that the anode impedance may have a high value, since the resistance i0 is no longer connected to the anode 5.
A similar result may be obtained by providing the auxiliary electrode 3 with an extension which extends through a comparatively small part of the discharge path B. In one practical form of construction the auxiliary electrode 3' and the screen grid 3 can, for example, be wound coaxially, the winding of the auxiliary electrode 3', being continued to such an extent that this electrode overlaps a small part of screen grid 3.
What I claim is:
1. An amplifying circuit arrangement comprising, first and second thermionic discharge paths enclosed in an evacuated envelope, said paths being connected in parallel relation and havin cathodes and anodes connected in common, the first thermionic discharge path having further a control grid electrode with given spacing between cathode and anode and given mutual conductance and a screen grid electrode, the second thermionic discharge path having further a control grid electrode with larger spacing between cathode and anode and lower mutual conductance than that of the first thermionic discharge path and an auxiliary electrode between the control grid and anode of the second thermionic discharge path, a source of desired signals, means to couple said source to the cathodecontrol grid circuits of the said first and second discharge paths, an electrode inserted between the screen grid and anode of the first thermionic discharge path, and means to couple said latter electrode to the auxiliary electrode whereby the second discharge path is blocked upon the source of desired signals reaching in magnitude a predetermined level.
2. An amplifying circuit arrangement comprising, first and second thermionic discharge paths enclosed in an evacuated envelope, said paths being connected in parallel relation and havin cathodes and anodes connected in common, the first thermionic discharge path having further a control grid electrode with given spacing between cathode and anode and given mutual conductance and a screen grid electrode, the second thermionic discharge path having further a control grid electrode with larger spacing between cathode and anode and lower mutual conductance than that of the first thermionic discharge path and an auxiliary electrode between the control grid and anode of the second thermionic discharge path, a source of desired signals, means to couple said source to the cathodecontrol grid circuits of the said first and second discharge paths, a resistive element, means to apply a source of direct current potential to said auxiliary electrode through said resistive element, and an electrode inserted between the screen grid and anode of the first thermionic discharge path, said latter electrode connected to the auxiliary electrode whereby the second discharge path is blocked upon the source of desired signals reaching in magnitude a predetermined level.
3. An amplifying circuit arrangement comprising, first and second thermionic discharge paths enclosed in an evacuated envelope, said paths being connected in parallel relation and having cathodes and anodes connected in common, the first thermionic discharge path having further a control grid electrode with given spacing between cathode and anode and given mutual conductance and a screen grid electrode, the
- second thermionic discharge path having further .-nals,vmeans to-couple said source controlid c rcuits ,e the is ish s discharge; paths, aresistive e le-me --D y aysource of direct urgent I'non,.'the first vthermionicrdi sel se ge path; *further a control ,gridelectrod with given sp srjiare {the control;
ioni d s h r alate sfiliie O and auxiliary e ec re e h tq he l e and an electrode having the sh S6 'ted' b'etwe'en the screen" first thermionic discharge path, said latter electrode connected to the auxiliary electrode whereby tne seeenu dischargepathii's blocked Iupon'athe source of desired. signals reaching in magnitude a predetermined level. V
4. An amplifying circuit arrangement comprising? first and second thermionic discharge ipaths enclosed in an evacuated': envelope said :"paths being connectedjn parallel relati ing between cathode and anode and given mutual conductance and a screen grid electrode, the second thermionic discharge path having further a control grid electrode with larger spacing between cathode and anode and lower mutual conductance than that of the first thermionic discharge path and an auxiliary electrode between the control grid and anode of the second thermionic discharge path, a source of desired signals, means to couple said source to the cathodecontrol grid circuits of the said first and second discharge paths, a resistive element, means to :apply a source :auxiliary electrode through said resistive element, :and an extension of the said auxiliary electrode of direct current potential to said inserted between the screen grid and anode in the :first thermionic discharge path whereby the second discharge path is blocked upon the source of desired signals reaching in magnitude a predetermined level.
5. An amplifying circuit arrangement comprising, first and second thermionic discharge paths enclosed in an evacuated envelope, said paths being connected in parallel relation and havin cathodes and anodes connected in common, the first thermionic discharge path having further a control grid electrode with given spacing between cathode and anode and given mutual conductance, the second thermionic discharge path having further a control grid electrode with larger spacing between cathode and anode and lower mutual conductance than that of the said first thermionic discharge path and a screen grid electrode comprising of two parts insulated electrically from each other and inserted respectively in the first and second thermionic discharge paths, a source of desired signals, means to couple said source to the cathode control grid circuits of the said first and second discharge paths, a resistive element, means to apply a source of direct current potential to said auxiliary electrode through said resistive element, and an electrode between the screen grid and anode in the first thermionic discharge path, said latter electrode connected to the screen grid electrode in the second discharge path whereby the second discharge path is blocked upon the source of desired signals reaching in magnitude a predetermined level.
6. An amplifying circuit arrangement comprising, first and second thermionic discharge 'paths enclosed in an evacuated envelope, said ;paths being connected in parallel relation and cans to pf a'rod inrid andanode in the and an electnode l l and a o, e of the. fir ,the mion fiiseha l said latter electrode eonnected t' i the' a c e eby-the seco d d hais t oel ed-.-,upon lthe-.source of, desiredsignals reacting in magnitude apr'edetermined level.
7. An amplifying circuit arrangement comprising, first and second thermionic dischargepaths enclosed in an evacuated envelope, saidl paths being connected in parallel relation and. having a common cathode and common anode, the first thermionic discharge path having: further a control grid electrode with given spacing between cathode and anode and given mutual conductance and a screen grid electrode, the second thermionic discharge path having further a control grid electrode with larger spacing between cathode and anode and lower mutual conductance than that of the first thermionic discharge path and an auxiliary electrode between the control grid and anode of the second thermionic discharge path, a source of desired signals, means to couple said source to the cathodecontrol grid circuits of the said first and second discharge paths, a resistive element, means to apply a source of direct current potential to said auxiliary electrode through said resistive element,
and an electrode having the shape of a rod inserted between the screen grid and anode of the :first thermionic discharge path, said latter electrode connected to the auxiliary electrode Whereby the second discharge path is blocked upon the source of desired signals reachin in magnitude a predetermined level.
8. An amplifying circuit arrangement comprising, first and second thermionic discharge paths enclosed in an evacuated envelope, said paths being connected in parallel relation and having a common cathode and common anode, the first thermionic discharge path having further a control grid electrode with given spacing between cathode and anode and given mu-- tual conductance and a screen grid electrode, the second thermionic discharge path having further a control grid electrode with larger spacing between cathode and anode and lower mutual conductance than that of the first thermionic discharge path and an auxiliary electrode between the control grid and anode of the second thermionic discharge path, a source of desired signals, means to couple said source to the cathodecontrol grid circuits of the said first and second discharge paths, a resistive element, means to apply a source of direct current potential to said auxiliary electrode through said resistive element, and an extension of the said auxiliary electrode inserted between the screen grid and anode of the first thermionic discharge path, said latter electrode connected to the auxiliary electrode whereby the second discharge path is blocked upon the source of desired signals reachin in magnitude a predetermined level.
9. An amplifying circuit arrangement comprising, first and second thermionic discharge paths enclosed in an evacuated envelope, said paths being connected in parallel relation and having a common cathode and common anode, the first thermionic discharge path having further a control grid electrode with given spacing between cathode and anode and given mutual conductance and a screen grid electrode, the second thermionic discharge path having further a control grid electrode with larger spacing between cathode and anode and lower mutual conductance than that of the first thermionic discharge path and an auxiliary electrode wound coaxially with the screen grid electrode in the first discharge path and between the control grid and anode of the second thermionic discharge path, a source of desired signals, means to couple said source to the cathode-control grid circuits of the said first and second discharge paths, a resistive element, means to apply a source of direct current potential to said auxiliary electrode through said resistive element, and an extension of the said coaxially wound auxiliary electrode inserted in the first thermionic discharge path whereby the second discharge path is blocked upon the source of desired signals reaching in magnitude a predetermined level.
GERRIT HENDRIK PEIRUS ALMA.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 2,066,284 Ballantine Dec. 29, 1936 2,141,303 Jonker Dec. 27, 1938 2,263,825 Laughren Nov. 25, 1941 2,270,791 Strutt et a1. Jan. 30, 1942 2,315,043 Boucke Mar. 30, 1943
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE2538663X | 1945-06-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2538663A true US2538663A (en) | 1951-01-16 |
Family
ID=3895885
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US685187A Expired - Lifetime US2538663A (en) | 1945-06-27 | 1946-07-20 | Variable mutual conductance amplifier |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2538663A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2066284A (en) * | 1931-07-18 | 1936-12-29 | Rca Corp | Variable mu amplifier circuit |
| US2141303A (en) * | 1936-03-09 | 1938-12-27 | Philips Nv | Electric discharge tube |
| US2263825A (en) * | 1940-05-15 | 1941-11-25 | Hazeltine Corp | Signal translating stage |
| US2270791A (en) * | 1939-07-13 | 1942-01-20 | Rca Corp | Oscillator-modulator circuit |
| US2315043A (en) * | 1939-03-27 | 1943-03-30 | Patents Res Corp | Electric amplifier system |
-
1946
- 1946-07-20 US US685187A patent/US2538663A/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2066284A (en) * | 1931-07-18 | 1936-12-29 | Rca Corp | Variable mu amplifier circuit |
| US2141303A (en) * | 1936-03-09 | 1938-12-27 | Philips Nv | Electric discharge tube |
| US2315043A (en) * | 1939-03-27 | 1943-03-30 | Patents Res Corp | Electric amplifier system |
| US2270791A (en) * | 1939-07-13 | 1942-01-20 | Rca Corp | Oscillator-modulator circuit |
| US2263825A (en) * | 1940-05-15 | 1941-11-25 | Hazeltine Corp | Signal translating stage |
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