US1603432A - Vacuum-tube circuit - Google Patents

Description

VACUUM TUBE CIRCUIT Filed March 17, 1925 E Q E 66K?) @JULI/ wf-L 3\ v 2g@ /VVVW nu w Mishima uw 555%@ @am LQ/1g@ n lli atented et.. i9, 19126.

PATENT OFFICE.'

anniv 1v. waaraan', onnasr ORANGE, ,NEW JERSEY, AssIeNon To nAnIornneUnNoY \LABORATORIES, ING., -A CORPORATION 0F NEW JERSEY.

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Applicatioiiiled March 17, 1925. Serial No.. 16,092; y

'lhe primary object. of this invention is to stabilize 'the electrical conditionsl in a vacuum tube in such manner that the grid will be affected solely by the incoming radio wave impressed thereon," and to e1iminate distortions caused byelectrical strains set up from othersource.s,' such as otentialvariations at the plate. Further o jects and advantages of the invention, however, will be in part obviousand in part specifically referred to in the description hereinafter contained, which taken in connection with the accompanying dra-wings, discloses the principles'of the'invention as applied to the circuits of a radib receiving system. ln the drawingsw'lhe single figure is a diagrammatic vie'w of a radio receiving system adapted to func# tion in accordancewith the invention.

lt should be understood that the present disclosure is merely typical as regards the receiver as a whole and the latter accordingly will not described in detail, except .asregards' the particular features thereof which have-to do with the present invention. AI have found that the current leaving the grid can be controlled by taking the fila'- K ment leads through a coil of the same inductance as that which is`connected to the plate in such a way ythat the electrical strain produced at the end of one inductan'ce is counteracted by anl opposite and equal strain at the end of the other inductance.

.- Furthermore by magnetically coupling. the

indu'ctances above mentioned, the electrical strain from the plate to the grid will be counteracted by the strain from the grid to the filament, thereby preventing a current flow from the grid in the grid circuit. In.

late or filament will not.`

othe words the reac upon the grld, regardless of what the tube capacities are, and the tube will .therefore give true amplification throughoutits heating of the filament.

are cumulative for the radio current.

placed by a singlecoil included ductanceB. reviously mentioned.` The inductance to e employed in coils 3, 6 and 7 is not at-.all critical so long as the resistance thereby interposed in the filament circuit is not so large as .to interfere with proper It will be noted that the coils 6 and 7 are so relatedand connected in ycircuit as to counteract each other asregards the A battery current but In some instances the coils 6 and 7 maybe rein the nega tive filament lead.

The inductances 3a, 6l and ond tube.2 function in the manner above described andare similarly related. While -the coils 3b, 6", and 7b of tube 3 lin the 'next stage of amplification, and the coils 3, 3d,6 and 7? of the tube 4 of the last stage, function in the samemanner, both are connected .and related in a somewhat modified way on account of the different circuit conditions under which they operate. f

lt will be noted that the inducta'nces are so connectedthat any A;batteryvoltage variations will be neutralized and that the filament potential as regards the grid and plate ywill be held at an intermedia-te value.

Furthermore since under the. conditions above setforth no out of phase current-s will be'produced,l it is possible to polarize the transformer coils in such a way that the magnetic interference between them will be aminimum.

While the invention has been disclosed as applied to certain particular circuits it will beobvious that'many changes may be made therein without departing from its princifles as set forth in the appended claims.

claim:

1. A system of` electrical circuits includ.l

ing a three electrode vacuum tube, having means for preventing reactions from the plate filament circuit back onto the grid I comprising inductances in the plate and filament leads balan'cilg strains from the plate to the'grid by those from the filament to the grid..

2. A system of electrical circuits includ -ing athree electrode vacuum tube and means forpreventing reactions from the plate filament circuit back onto the grid, wherein the filament leads include substantially-,equal in- .ductance's, and the plate lead also includes inductance cooperating therewith to balance strains from the pla'te to the grid by those from the lament to the grid.y

3. A system of electrical circuits'including a three electrode vacuum tube and means for preventing reactions from the plate lilainent circuit back onto ythe grid, lwherein the plate circuit includes an/inductauce and the lilament circuit includes-a counterbalancing inductance of'substantially equal value.

4. A system of electrical circuits ,including a three electrode vacuum tube and means for preventing reactions from the plate filament circuit back onto the grid, wherein the plate circuit includes an inductance and the lilamentfcircuit includes a counterbalancing inductance of substantially equal value, said inductances being -magnetically 'coupled. l

5; A system of electricall circuits, comprising successive stages each including a threev electrode vacuum tube and With magnetic couplings between stages, means 1n said stages for balancing strains from grid to platefby those from Lgrid .to lament, "said means forming a part of the magnetic couplings aforesaid the secondary of one coup-j ling being so connected to the succeeding stage as to polarize the primary of the second stage with respect to the primary of the .first stage.

6. A system ofielectrical circuits includ-- ing a three electrode vacuum tube and means for preventingreacticns from the plate filament circuit back ontothe grid, wherein the lilament leads include substantially equal inductances, and the plate lead J also includes inductance cooperating therewith to balance strains from the plate to the grid by those from the filament to the grid,

said first mentioned inductances being magnetically coupled.

ment leads balancing strains from the plate fto the grid by those from the filament to the grid, said inductances being'magnetically coupled. i

In testimony that I claim the foregoing, I have hereunto set my hand this 10th day of March,` 1925. n

JOHN N. VARREN.

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