Power - Triode (over 1000V 100W) ·Triode
Directly heated Philips transmitting triode suitable for grounded-grid RF power operation. Rated for approximately 450 W plate dissipation and 4 kV plate voltage, with moderate gain and substantial transmitting power capability.
TB41250 is a Philips grounded-grid-capable transmitting triode. The supplied datasheet provides direct-filament data, RF/AF ratings, capacitances and high-power operating conditions.
General specifications
Properties common to every published source and operating point.
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
1 physical section, each with unique specifications.
Section 1
Published filament, capacitance, typical characteristics, limiting values and RF/AF operating tables reviewed.
Source-dependent data
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.
Data set 01
Published operating points and test conditions from this source.
Filament voltage
10 V
DirectlyHeated
Filament current
9.9 A
DirectlyHeated
Amplification factor
28
Published
Transconductance
4500 µS
Published
Plate capacitance
0.17 pF
Published
Grid capacitance
8 pF
Published
Grid-to-plate capacitance
7 pF
Published
Data set 02
Published operating points and test conditions from this source.
Filament voltage \ 10 Vv
10 a
Filament voltage \ 10 Vv
Filament current I
99 a
Filament current I = 99 A
Anode to all other elements except grid C,
170 mA
Anode to all other elements except grid C, = 0.17 pF
Grid to all other elements except anode Cg
8 a
Grid to all other elements except anode Cg = 8.0 pF
Anode to grid Cag
7 A
Anode to grid Cag = 7.0 pF
50 Mc/s, it will be necessary to direct a low-velocity air flow on the anode seal
50 s
50 Mc/s, it will be necessary to direct a low-velocity air flow on the anode seal
RF power triode JL TB4/1250
1250 w
RF power triode JL TB4/1250
Wavelength b
3 W
Wavelength b = 3 3 3 3
Anode voltage vV,
2500 A
Anode voltage vV, = 4000 3500 3000 2500
Grid voltage Vg
-200 v
Grid voltage Vg = -350 =300 ~250 -200
Anode current I
535 A
Anode current I = 535 535 535 535 mA
Grid current Ig
115 mA
Grid current Ig = 115 115 115 115 mA
Grid input power Wig
42 w
Grid input power Wig = 60 54 48 42
Anode input power Wia
1340 A
Anode input power Wia = 2140 1880 1600 1340
Anode dissipation W,
390 A
Anode dissipation W, = 450 450 425 390
Wavelength A
3 W
Wavelength A = 3 3 3
Anode voltage Vg
2500 A
Anode voltage Vg = 4000 3500 3000 2500
Grid resistor Rg
1800 s
Grid resistor Rg = 3000 2600 2200 1800
Anode current I,
535 A
Anode current I, = 535 535 535 535
Anode dissipation Wy
390 A
Anode dissipation Wy = 450 450 425 390
Fig. 2 Grounded grid configuration
2 nf
Fig. 2 Grounded grid configuration.
Wavelength A
3 W
Wavelength A = 3 3 3 3
Anode voltage V,
2500 A
Anode voltage V, = 4000 3500 3000 2500
Grid voltage Vg
-200 v
Grid voltage Vg = =350 -300 -250 -200
Anode current I,
35 A
Anode current I, = 2x535 2x535 2x535 2x535 mA
Grid current Ig
15 mA
Grid current Ig = 2xI15 2x115 2x115 2x115 mA
Grid input power Wig
12 w
Grid input power Wig = 2x320 2x274 2x248 2x212
Anode input power Wia
340 A
Anode input power Wia = 2x2140 2x1880 2x1600 2x1340
Anode dissipation W,
90 A
Anode dissipation W, = 2x450 2x450 2x425 2x390
RF power triode J L TB“/‘25°
25 w
RF power triode J L TB“/‘25°
Frequency f upto 100 MHz
100 MHz
Frequency f upto 100 MHz
Wavelength A
3 W
Wavelength A = 3 m
Anode voltage Va
3000 A
Anode voltage Va = 3000 \%
Grid voltage Vg
-375 v
Grid voltage Vg = ~-375 v
Anode current I,
450 A
Anode current I, = 450 mA
Grid current Ig
85 mA
Grid current Ig = 85 mA
Grid input power wig
42 w
Grid input power wig = 42 w
Anode input power Wia
1350 A
Anode input power Wia = 1350 w
Anode dissipation W,
300 A
Anode dissipation W, = 300 w
Modulation power Wmod
675 a
Modulation power Wmod = 675 W
Amplification factor u
28 A
Amplification factor u = 28
Temperature of anode seal max. 220 el
220 a
Temperature of anode seal max. 220 el
Temperature of bottom pin seals max. 180 °c
180 a
Temperature of bottom pin seals max. 180 °c
Bulb temperature max. 250 °¢
250 a
Bulb temperature max. 250 °¢
Anode connector: 40626 max 118
118 A
Anode connector: 40626 max 118
Anode voltage
4000 A
Anode voltage = max. 4000
Anode dissipation
450 A
Anode dissipation = max. 450
Grid dissipation
50 s
Grid dissipation = max. 50
Cathode current
650 a
Cathode current = max. 650
Peak grid AC voltage Vgp
405 a
Peak grid AC voltage Vgp = 580 520 460 405 \Y
Output power Wy,
950 w
Output power Wy, = 1690 1430 1175 950
Efficiency n
71 %
Efficiency n = 79 76 73.5 71 %
Peak grid AC voltage Vgp
405 a
Peak grid AC voltage Vgp = 580 520 460 405
Output power W,
908 w
Output power W, = 1630 1376 1127 908
Peak grid voltage Vgp
405 a
Peak grid voltage Vgp = 580 520 460 405
Output power Wy
340 w
Output power Wy = 3380+520 2860+440 2350+400 1900+340
Efficiency 7
71 %
Efficiency 7 = 79 76 73.5 71 %2)
Anode voltage 7 Va
3000 A
Anode voltage 7 Va = max. 3000 V
Anode dissipation W,
300 A
Anode dissipation W, = max. 300 W
Grid dissipation Wg
50 s
Grid dissipation Wg = max. 50 w
Grid current Ig
115 ma
Grid current Ig = max. 115 mA
Cathode current Iy
550 a
Cathode current Iy = max. 550 mA
Peak grid AC voltage Vgp
580 a
Peak grid AC voltage Vgp = 580 \%
Output power Wo
1050 w
Output power Wo = 1050 w
Efficiency n
78 %
Efficiency n = 78 %
Anode voltage V,
4000 A
Anode voltage V, = max. 4000
Anode dissipation W,
450 A
Anode dissipation W, = max. 450
Grid dissipation Wg
50 s
Grid dissipation Wg = max. 50
Cathode current I,
700 a
Cathode current I, = max. 700 mA
Peak cathode current Ikp
5 a
Peak cathode current Ikp = max. 5