TUBE: PX4
FICHIER SOURCE: sheets/126/p/PX4.pdf
FABRICANT: Marconi (Marconi's Wireless Telegraph Company Limited)
ANNÉE: JULY 1956
LANGUE: en

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[Logo Marconi] POWER TRIODE — PX4 — JULY, 1956

DESCRIPTION
Type PX4 is a directly heated power triode for the output stage of receivers and amplifiers where a considerable undistorted power output is required with an anode voltage up to 300.
The filament is of the robust oxide coated type and may be heated from A.C. through a suitable step-down transformer.

RATINGS
Filament Voltage ...... 4.0 volts
Filament Current ...... 1.0 approx. amp
Anode Voltage ......... 300 max. volts
Anode Current ......... 50 mA
Anode Dissipation ..... 15 max. watts
Mutual Conductance .... 6 mA/V       } measured at Va=100, Vg=0
Amplification Factor .. 5
Impedance ............. 830 ohms

Capacitances:
Anode to Control Grid ...... 13.7 approx. pF
Control Grid to Filament ... 7.7 ,, ,,
Anode to Filament .......... 3.9 ,, ,,

DIMENSIONS: bulb 52 (diam) ; length 130 / 144 ; base 34 / 41 (mm)
BASE 4-PIN (View looking on underside of base):
1: Anode
2: Control Grid
3: Filament
4: Filament

MARCONI'S WIRELESS TELEGRAPH COMPANY LIMITED, Marconi House, Chelmsford.

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PX4
OPERATING CONDITIONS

Single Valve Class A.
Anode Voltage ....... 300 | 250 | 200 volts
Anode Current ....... 50 | 60 | 30 mA
Bias Resistor ....... 1000 | 600 | 1000 ohms
Anode Load Resistor . 3500 | 2500 | 3500 ohms
Power Output ........ 4.5 | 3.2 | 1.6 watts
Distortion .......... 4 | 4 | 5 %
Input Signal ........ 49 | 36 | 30 volts

Two Valves in Push-Pull.
Anode Voltage ........... 300 | 250 volts
Anode Current (per pair). 100 | 116 mA
Bias Resistor (per valve) 1000 | 650 ohms
Bias Voltage ............ -50 | -38 approx. volts
Anode Load Resistor ..... 4000 | 3000 ohms
Power Output ............ 13.5 | 9 watts
Distortion .............. 2.5 | 2 %
Input Signal ............ 110 | 80 approx. volts

The total resistance in the grid circuit should in no case exceed 250,000 ohms. Automatic bias should always be employed... A grid stopper resistor to prevent parasitic oscillation is required.

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PX4
[schéma seul — pas de données tabulaires]
TWO VALVES IN CLASS AB1 PUSH-PULL AMPLIFIER CIRCUIT (avec L63 driver, transfo de sortie).
If used as a radio receiver employing a diode-triode detector valve, type DL63 should be used in place of type L63.

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PX4
[courbes seules — pas de données tabulaires]
Graphique 1: Anode current vs Grid Voltage pour Ea=300/250/200/150/100, limite 15 WATTS.
Graphique 2: Anode current vs Anode Voltage, courbes Eg=0 à -90, limite 15 WATTS.
CHARACTERISTIC CURVES OF AVERAGE VALVE. (réf OV.8685, Printed in England.)