Classification- Dome-type bulb of glass, filametary of carbennation Th-w a copper ceramic base with four-prong bayonet golden pins, carbon plate triode. Application -Audio power amplifier Class A or Class B or Class C.Dimensions -Dimensions, outline diagrams of the tube and bases, and the arrangement of electrode connections to the base terminals are shown in Figures 1 and 2.
Fig 1 Fig 2 Nominal operating conditions and parametersFilament voltage …………………………………………………………… 10V Nominal filament current …………………………………………………… 3.2A Plate voltage ………………………………………………………………… 1250V Grid voltage ………………………………………………………………… -70V Plate current …………………………………………………………………100mA Amplification factor ……………………………………………………………12 Load resistance ……………………………………………………………… 7 kohms Output power ………………………………………………………………… 10W Grid to plate transconductance …………………………………………… 3.8mA / VSuggest Operating conditions and parameters Class A power amplifier of single tube (A-F)
|
Plate voltage
|
750
|
1000
|
1250
|
V
|
|
Grid voltage
|
-46
|
-61
|
-80
|
V
|
| Load resistance |
8.8
|
7.6
|
9.2
|
kohms
|
|
Plate current
|
34
|
53
|
60
|
mA
|
|
Signal voltage(pk)
|
41
|
56
|
75
|
V
|
|
Plate resistance
|
4.4
|
3.8
|
3.6
|
kohms
|
|
Output power
|
5.6
|
12
|
19.7
|
W
|
Class B power amplifier of push-pull (A-F)
|
Plate voltage
|
1000
|
1250
|
V
|
|
Grid voltage
|
-72
|
-95
|
V
|
|
Load resistance
|
6.9
|
9
|
kohms
|
|
Plate current(0 single)
|
20
|
20
|
mA
|
|
Plate current(max single)
|
320
|
320
|
mA
|
|
Signal Voltage(pk)
|
380
|
410
|
V
|
|
Output power
|
200
|
260
|
W
|
Class B power amplifier of single tube(modulate coefficient shall be 1) (R-F)
|
Plate voltage
|
1000
|
1250
|
V
|
|
Grid voltage
|
-72
|
-95
|
V
|
|
Plate current
|
130
|
106
|
mA
|
|
Signal Voltage(pk)
|
125
|
125
|
V
|
|
Output power
|
40
|
42
|
W
|
| Grid current(approx) |
5
|
1
|
mA
|
| Grid power(input)(approx) |
10
|
7.5
|
W
|
Class C power amplifier of single trbe(max modulate coefficient shall be 1)
| Plate voltage |
750
|
1000
|
V
|
|
Grid voltage
|
-200
|
-260
|
V
|
|
Plate current
|
150
|
150
|
mA
|
|
Signal Voltage(pk)
|
350
|
410
|
V
|
|
Output power
|
65
|
100
|
W
|
| Grid current (approx) |
35
|
35
|
mA
|
| Grid power (input)(approx) |
12
|
14
|
W
|
Characteristics-Average characteristics Figure 3. Shown typical curves of plate currents of grid voltage for several values of plate voltages. It is alternating-current filament supply.
Fig. 3
Limiting Operation Conditions for Safe Nor simultaneous ratings
|
Class
|
ClassA(A-F)
|
A push-pull Class B(A-F)
|
Class B(R-F)
|
Class C
|
|
|
Maximum plate voltage
|
1250
|
1250
|
1250
|
1000
|
V
|
|
Maximum plate dissipation
|
75
|
100
|
100
|
67
|
W
|
|
maximum plate current (max sig. Per tube)
|
175
|
150
|
175
|
mA
|
|
|
maximum Grid current
|
50
|
mA
|
|||
|
maximum plate dissipation(in)
|
175
|
W
|
|||
|
max Grid voltage
|
-400
|
V
|