TJ FULLMUSIC 845 DATA SHEET

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 A1 or Class AB1.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 2.845_01  845 Fig. 1                                                                                                                                              Fig. 2 Nominal operating conditions and parameters Filament voltage* …………………………………………………………… 10V Nominal filament current …………………………………………………… 3.2A Plate voltage ………………………………………………………………… 1250V Grid voltage** ……………………………………………………………… -200V Plate current ………………………………………………………………… 80mA Plate resistance ………………………………………………………………1.7kohms Amplification factor …………………………………………………………… 5.0 Load resistance ……………………………………………………………… 3.4 kohms Signal voltage(pk) ………………………………………………………… …69.0V Output power ………………………………………………………………… 15W Grid to plate transconductance………………………………………………3.0mA / V *Alternating-current filament supply or Direct-current filament supply. **Alternating-current filament supply is used. The grid and plate returns should be connected to a center tap on the secondary of the filament transformer. Direct-current filament supply is used. The grid and platter returns are connected to the negative end of the filament. Suggest Operating conditions and parameters Class A1 power amplifier of single tube

Plate voltage
1000
1000
1250
V
Grid voltage
-145
-155
-209
V
Load resistance
6
9
16
kohms
Plate current
90
65
52
mA
Signal voltage(pk)
110
145
V
Plate resistance
1.7
1.9
2.1
kohms
Output power
24
21
24
W

Lass AB1 power amplifier of push-pull

Plate voltage
800
1000
1000
1250
V
Grid voltage
-125
-170
-175
-225
V
Load resistance
45
46
46
66
kohms
Plate current
80
70
40
40
mA
Signal voltage(pk)
177
240
V
Plate current (max. sig,)
177
240
V
Output power
40
75
75
75
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.845_02 Fig. 3 Limiting Operation Conditions for Safe Nor simultaneous ratings Maximum plate voltage ………………………………………………… 1250 volts Maximum plate dissipation …………………………………………… 75 watts Maximum plate current …………………………………………………120mA Maximum input powe of signal ………………………………………… 150 watts

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