Since 1872   
WE 300B
Performance Graphs & Mechanical Dimensions

Power Output and Distortion

Performance data including power output, second and third harmonic levels for a number of operating conditions are given in the table.

The variation of power output and harmonic levels with load resistance for several values of operating plate current are shown in Figures 7, 8 and 9, for a plate voltage of 350 volts.

The peak value of the sinusoidal input voltage, Egm, which gives the indicated power output, Pm and harmonic levels, F2m and F3m for each point in both the curves and the table, is numerically equal to the grid biasing voltage at that point. For a smaller input voltage Eg, the approximate levels may be computed from the following relations.

P=Pm(Eg/Egm)^2

F2=F2m+20 log10(Eg/Egm)

F3=F3m+40 log10(Eg/Egm)


 
 
PlateVoltage 
Grid Bias 
Plate Current 
Load Resistance 
Power Output 
2nd Harmonic 
3rd Harmonic 
Volts 
Volts 
Milliamps 
Ohms 
Watts 
db 
db 
200 -42 30 2000 3.0 20 31
200 -39 40 2500 2.6 26 38
200 -37 50 2500 2.5 30 45
250 -55 30 2000 4.9 18 27
250 -55 30 4500 3.2 27 40
250 -52 40 3000 4.0 26 36
250 -50 50 2500 4.4 26 39
250 -48 60 2000 4.7 26 38
250 -48 60 2700 4.1 30 45
250 -45 80 1500 5.0 26 41
300 -65 40 2500 6.7 20 30
300 -63 50 2000 7.2 21 29
300 -63 50 3000 6.1 26 37
300 -61 60 2400 6.6 26 37
300 -61 60 3400 5.6 30 44
300 -58 80 1700 7.5 26 37
350 -76 50 3600 7.8 26 38
350 -76 50 5000 6.2 30 45
350 -74 60 2000 10.2 21 30
350 -74 60 3000 8.3 26 38
350 -74 60 4000 7.0 30 44
350 -71 80 2200 9.6 26 39
400 -91 40 5000 8.4 26 37
400 -89 50 3000 11.5 21 31
400 -89 50 4000 9.4 25 38
400 -87 60 3500 10.5 26 38
400 -87 60 5000 8.3 30 46
400 -84 80 2500 12.5 25 37
450 -104 40 6000 9.5 26 38
450 -102 50 5000 10.7 27 39
450 -102 50 6500 9.0 30 45
450 -100 60 4000 12.5 26 38
450 -100 60 5500 10.1 30 44
450 -97 80 2000 17.8 21 30
450 -97 80 3000 14.6 26 37
450 -97 80 4500 11.5 31 45


Characteristics Plate-current characteristics for a typical tube are shown in Figure 3 as functions of grid bias, for alternating-current filament supply. The corresponding amplification-factor, plate-resistance, and transconductance characteristics are given in Figures 4, 5, and 6, respectively. When direct-durrent filament supply is used, and the grid and plate returns are connected to the negative end of the filament, the same characteristics are applicable if 3.5 is subtracted from the numerical value of each grid bias.


Outline Drawing of 300B Vacuum Tube


Ordering Information: (Order by Comcode)
Code 300B Electron Tube
Application Moderate Power Triode
Comcode 100792522

 

 

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