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GU-43 B
TETRODE
The GU-43B tetrode is used for continuous operation at frequencies up to 100 MHz in separately- or self-excited oscillator circuits and as linear power amplifiers in RF equipment
GENERAL
Cathode: indirectly heated, oxide-coated.
Envelope: glass-to-metal.
Cooling: forced air.
Height: at most 125 mm.
Diameter: at most 100 mm.
Mass: at most 1.5 kg
| OPERATING ENVIRONMENTAL CONDITIONS | |
| Vibration loads: | |
| frequencies, Hz | 10-200 |
| acceleration, m/s² | 59 |
| frequencies, Hz | 200-600 |
| acceleration, m/s² | 20 |
| Multiple impacts with acceleration, m/s² | 343 |
| Linear leads with acceleration, m/s² | 147 |
| Relative humidity at up to +40 °C, % | 98 |
| BASIC
DATA Electrical Parameters |
|
| Heater voltage, V | 12.6 |
| Heater current, A | 6-7.2 |
| Mutual conductance (at anode voltage 1 kV, grid 2 voltage 350 V, anode current 1 A, grid 1 voltage change ±2.5 V), mA/V | 40-50 |
| Negative bias voltage (at anode voltage 1 kV, grid 2 voltage 350 V, anode current 1 A),V | 20-30 |
| Interelectrode capacitance, pF: | |
| input | 80-100 |
| output | 10-18 |
| transfer, at most | 0.1 |
| Cathode heating time, s, at most | 180 |
| Output power (at anode voltage 3 kV, grid 2 voltage 350 V, anode current 0.9 A), kW, at least | 1.6 |
| Output power over 1,000 h of service, kW, at least | 1.3 |
| Limit Operating Values | |
| Heater voltage, V | 11.3-13.9 |
| Anode voltage, kV | 3.3 |
| Grid 2 voltage, V | 500 |
| Negative grid 1 voltage, V | 200 |
| Cathode current, A: | |
| DC component | 1 |
| peak value | 3.2 |
| Dissipation, W: | |
| anode | 1,000 |
| grid 2 | 28 |
| grid 1 | 5 |
| Temperature at seals, °C | 150 |
CHART 1 Averaged
Anode Characteristic Curves:
Uf = 12.6V; Ug2
= 350V;
— • — Pa max
CHART 2 Averaged
Anode-Grid Characteristic Curves:
Uf = 12.6V; Ug2
= 350V
CHART 3 Averaged
Grid 2-Anode Characteristic Curves:
Uf = 12.6V; Ug2
= 350V
SO THIS IS THE TUBE, MYSELF AND ALEX, ON4CEP, ARE GOING TO BUILD OUR AMPLIFIER WITH. IT IS A GLASS- METAL TUBE, NOT THE MOST MODERN ONE, BUT THE VOLTAGES AND CURRENTS NEEDED FOR ANODE, CATHODE AND GRIDS ARE PRACTICAL VALUES. A MAJOR PLUS IS THAT WE'VE GOT THE ORIGINAL BASE AND FOUR NEW OLD STOCK TUBES FOR A GIVE-AWAY PRICE.
WE ARE STILL BUSY COLLECTING THE PARTS AND VISITED SEVERAL HAM FESTS IN BELGIUM, GERMANY AND HOLLAND. IT WON'T BE A TABLE MODEL BECAUSE MOST OF THE COMPONENTS ARE NOT MADE FOR HAM AMPS BUT BROADCASTING AMPLIFIERS.
IMPORTED FROM THE USA, MOTOR DRIVEN JENNINGS VACUUM CAPACITORS FOR PLATE AND LOAD AND JENNINGS RJ1A VACUUM RELAYS FOR ANTENNA SWITCHING.
WE ALSO BOUGHT UNUSED CDE 32MF -6KV OIL-FILLED FILTER CAPACITORS FROM A HAM IN THE USA.
ONE ALWAYS BUY'S SURPLUS PARTS. WE BOUGHT BRAND-NEW 3POLE, 8 TROW, 30AMP ROTARY- SWITCHES (4" dia. with heavy silver plated contacts) IN GERMANY. AT A HAM-FEST IN HOLLAND WE COULD'NT RESIST BUYING TWO UNUSED MASSIVE VARIABLE ROLLER-INDUCTORS ( RHODE & SCHWARTZ) , LENGTH; 33CM (13"), WIDTH; 20CM (8") AND WEIGHT; 9.5KG (21 pounds). THE UNUSED SECTION OF THESE COILS CAN ALSO BE SHORTED WITH SILVER-PLATED FINGERS. THE 5 STEATITE RODS TO HOLD THE COIL IN PLACE, ARE ABOUT 2.5CM (1") IN DIAMETER. THE COIL WILL BE MOTOR- DRIVEN SO REMOTE - CONTROL OF THE AMP. IS POSSIBLE NOW. THESE COILS WERE SPARES FOR RHODE & SCHWARTZ BROADCASTING TRANSMITTERS.
SOMETIMES YOU BUY SOMETHING BECAUSE IT'S VERY CHEAP, BUT AFTERWARDS IT LOOKS REDICULOUS. THIS WAS THE CASE WITH OUR DRALORIC TANK BLOCKING CAPACITOR.THE 1200PF VALUE WAS RIGHT BUT IT WAS FOR 80 KVA AND WITH A DIAMETER OF 20CM (8").
SEE YOU AT ONE OF THE HAM-FEST'S WERE WE'RE LOOKING FOR PARTS.
This page is created by ON4CFZ on 01-03-2001.
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