AT139237B - Circuit for protective grid tubes. - Google Patents

Circuit for protective grid tubes.

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Publication number
AT139237B
AT139237B AT139237DA AT139237B AT 139237 B AT139237 B AT 139237B AT 139237D A AT139237D A AT 139237DA AT 139237 B AT139237 B AT 139237B
Authority
AT
Austria
Prior art keywords
circuit
protective grid
grid tubes
resistor
tubes
Prior art date
Application number
Other languages
German (de)
Original Assignee
Philips Nv
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
Application filed by Philips Nv filed Critical Philips Nv
Application granted granted Critical
Publication of AT139237B publication Critical patent/AT139237B/en

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Description

  

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  Schaltung für   Schutzgitterröhren.   
 EMI1.1 
 

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 spannung 50 Volt, während   angenommen   wird, dass der mittlere Anodenstrom 1 Milliampere und der mittlere Schutzgitterstrom 0'3 Milliampere beträgt, so hat im Fall von Fig. 1 der Widerstand 6 einen Wert von 77.000 Ohm und der Widerstand 8 einen Weit von 170.000 Ohm, d. h. für Wechselstrom ent-   splicht   die Gesamtanodenimpedanz 53.000 Ohm, wobei angenommen ist, dass der Kondensator 9 so gross ist, dass er für Wechselstrom   Kurzschluss   bedeutet. 



   Im Fall von Fig. 2 beträgt aber der Widerstand 6 86.000 Ohm, der Teilwiderstand 10, 11 beträgt 46.000 Ohm und der Widerstand 8 300.   000 Ohm.   Dies entspricht einer gesamten Anodenimpedanz von 80.000 Ohm. 



   Aus diesem Beispiel ist zu ersehen, dass durch die Schaltung nach der Erfindung ein wesentlicher Fortschritt in der Verstärkung erzielt wird. Der Vorteil wird noch grösser, wenn die   Schutzgitterspannung   in bezug auf die Anodenspannung grösser als im beschriebenen Fall ist. 



   Es kann unter Umständen günstig sein, in der Schaltung nach Fig. 2 noch einen Widerstand parallel zu dem Kondensator 9 anzuordnen, u. zw. insbesondere, wenn die Schutzgitterströme für die verschiedenen Röhren sehr verschieden sind. Die Verstärkung wird dadurch etwas herabgesetzt.



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  Circuit for protective grid tubes.
 EMI1.1
 

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 voltage 50 volts, while it is assumed that the mean anode current is 1 milliampere and the mean protective grid current is 0.3 milliamps, then in the case of Fig. 1 the resistor 6 has a value of 77,000 ohms and the resistor 8 has a value of 170,000 ohms, d. H. for alternating current the total anode impedance corresponds to 53,000 ohms, it being assumed that the capacitor 9 is so large that it means a short circuit for alternating current.



   In the case of FIG. 2, however, the resistance 6 is 86,000 ohms, the partial resistance 10, 11 is 46,000 ohms and the resistance 8 is 300,000 ohms. This corresponds to a total anode impedance of 80,000 ohms.



   From this example it can be seen that the circuit according to the invention achieves a substantial advance in amplification. The advantage is even greater if the protective grid voltage in relation to the anode voltage is greater than in the case described.



   Under certain circumstances it can be advantageous to arrange a resistor in parallel with the capacitor 9 in the circuit according to FIG. especially if the protective grid currents for the various tubes are very different. This will reduce the gain somewhat.

Claims (1)

PATENT-ANSPRUCH : Schaltung für den Empfang bzw. die Verstärkung von elektrischen Strömen, bei der Schutzgitterröhren. verwendet werden, in deren Schutzgitterkreis ein Ohmscher Widerstand vorgesehen ist. dadurch gekennzeichnet, dass dieser Widerstand zum Teil aus einem so grossen Teil der Ohmschen Anodenkreisbelastung besteht, dass Schwankungen des Anodengleichstroms kompensiert werden. EMI2.1 PATENT CLAIM: Circuit for the reception or the amplification of electrical currents, with the protective grid tubes. can be used, in whose protective grid circuit an ohmic resistor is provided. characterized in that this resistor consists partly of such a large part of the ohmic anode circuit load that fluctuations in the anode direct current are compensated. EMI2.1
AT139237D 1931-05-28 1932-05-06 Circuit for protective grid tubes. AT139237B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE139237T 1931-05-28

Publications (1)

Publication Number Publication Date
AT139237B true AT139237B (en) 1934-10-25

Family

ID=34257162

Family Applications (1)

Application Number Title Priority Date Filing Date
AT139237D AT139237B (en) 1931-05-28 1932-05-06 Circuit for protective grid tubes.

Country Status (1)

Country Link
AT (1) AT139237B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2868896A (en) * 1953-03-04 1959-01-13 Cgs Lab Inc Amplifier-electrical control system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2868896A (en) * 1953-03-04 1959-01-13 Cgs Lab Inc Amplifier-electrical control system

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