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1619
Beam Power Tube

Base & Bulb ( RCA DS 06/08/38)

Application

Coated-filament type having metal shell used as af power amplifier and modulator and as rf power amplifier and oscillator. May be used with full input to 45 MHz. For operation at 60 MHz, plate voltage and plate input should be reduced to 90 per cent of maximum ratings; at 90 MHz, to 77 per cent. Requires octal socket and may be operated in vertical position only, base up or down.Base similar to 7AC except no cathode.

Mechanical Data

Bulb .......................................... MT-10A
Base .......................................... Small Wafer Octal 7-Pin
Outline ....................................... 10-1
EIA Base ...................................... 7AC
Mounting Position ............................. Vertical Base Up or Down

Electrical Data

Heater Voltage ................................ 2.5 V
Heater Current ................................ 2.0 A

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 10.5 pf
Output ........................................ 12.5 pf
Grid to Plate ................................. 0.35 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 400 V
Grid No. 2 Voltage ............................ 300 V
Plate Dissipation ............................. 15 W
Grid No. 2 Dissipation ........................ 3.5 W

Characteristics and Typical Operation

Class A Amplifier
Plate Voltage ................................. 300 V
Grid No. 3 Voltage ............................ 0 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage ............................ -10 V
Peak Grid No. 1 Voltage........................ 10 V
Plate Current (Zero Signal) ................... 44 mA
Plate Current (Maximum Signal) ................ 46 mA
Grid No. 2 Current (Zero Signal) .............. 4 mA
Grid No. 2 Current (Maximum Signal) ........... 6 mA
Load Resistance ............................... 8800 Ω
Power Output (approx) ......................... 3 W
Total Harmonic Distortion ..................... 7 %

Characteristics and Typical Operation

Push Pull Class AB1 Amplifier
Plate Voltage ................................. 400 V
Grid No. 3 Voltage ............................ 0 V
Grid No. 2 Voltage ............................ 300 V
Grid No. 1 Voltage ............................ -20 V
Peak Grid No. 1 Voltage........................ 40 V
Plate Current (Zero Signal) ................... 52 mA
Plate Current (Maximum Signal) ................ 80 mA
Grid No. 2 Current (Zero Signal) .............. 3.5 mA
Grid No. 2 Current (Maximum Signal) ........... 10 mA
Load Resistance ............................... 14K Ω
Power Output (approx) ......................... 17.5 W
Total Harmonic Distortion ..................... 3 %

Characteristics and Typical Operation

Push Pull Class AB2 Amplifier
Plate Voltage ................................. 400 V
Grid No. 3 Voltage ............................ 0 V
Grid No. 2 Voltage ............................ 300 V
Grid No. 1 Voltage ............................ -16.5 V
Peak Grid No. 1 Voltage........................ 77 V
Plate Current (Zero Signal) ................... 75 mA
Plate Current (Maximum Signal) ................ 150 mA
Grid No. 2 Current (Zero Signal) .............. 6.5 mA
Grid No. 2 Current (Maximum Signal) ........... 11.5 mA
Driving Power ................................. 0.4 W
Load Resistance ............................... 6000 Ω
Power Output (approx) ......................... 36 W
Total Harmonic Distortion ..................... 2.5 %

Characteristics and Typical Operation

Class C Amplifier
Plate Voltage ................................. 400 V
Grid No. 3 Voltage ............................ 0 V
Grid No. 2 Voltage ............................ 300 V
Grid No. 2 Dropping Resistor .................. 9.5K Ω
Grid No. 1 Voltage ............................ -55 V
Grid No. 1 Voltage Derived from
Grid No. 1 Resistor ......................... 11K Ω
Peak Grid No. 1 Voltage........................ 80 V
Grid No. 1 Current ............................ 5 mA
Plate Current ................................. 75 mA
Grid No. 2 Current ............................ 10.5 mA
Driving Power ................................. 0.36 W
Power Output (approx) ......................... 19.5 W

Characteristics and Typical Operation

Class C Modulated Amplifier (Grid)
Plate Voltage ................................. 400 V
Grid No. 3 Voltage ............................ 0 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage ............................ -50 V
Grid No. 1 Voltage Derived from
Grid No. 1 Resistor ......................... 1500 Ω
Peak Grid No. 1 Voltage........................ 58 (30) V
Grid No. 1 Current ............................ 1.2 mA
Plate Current ................................. 31 mA
Grid No. 2 Current ............................ 1.5 mA
Driving Power ................................. 0.25 W
Power Output (approx) ......................... 3.8 W

Characteristics and Typical Operation

Class C Modulated Amplifier (Plate)
Plate Voltage ................................. 325 V
Grid No. 3 Voltage ............................ 0 V
Grid No. 2 Voltage ............................ 285 V
Grid No. 2 Dropping Resistor .................. 5K Ω
Grid No. 1 Voltage ............................ -50 V
Grid No. 1 Voltage Derived from
Grid No. 1 Resistor ......................... 18K Ω
Peak Grid No. 1 Voltage........................ 70 V
Grid No. 1 Current ............................ 2.8 mA
Plate Current ................................. 62 mA
Grid No. 2 Current ............................ 7.5 mA
Driving Power ................................. 0.18 W
Power Output (approx) ......................... 13 W

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