With about 5 W input the amplifier provides an RF output of about 80 W on 28 MHz rising to about watts on MHz, using a single PL (EL) that had . EL/6KG6. High Performance Beam Power. Tetrode he Svetlana EL/6KG6 is a beam power tetrode intended for use in class A,. AB or B audio amplifiers. EL Substitutes. No information available. EL Ratings. No information available. EL Application Data. No information available. EL Data sheet.
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Furthermore it varies during a SSB transmission because the driver the transceiver is delivering power varying between say 0. It has 9 turns with an inner diameter of 25 mm and a length of about 60 mm. Don’t forget the control lead for the relay! The attack and delay time is determined by the base components. The coil L1 for the 10—30 m band is made of 2. Off-resonance, hefty currents can flow through the valves!
EL519 Datasheet PDF
However, the situation is el5119 that bad. This is why forced air-cooling is needed to get maximum power from this valve. Although, in the case of the PL, closer to its glass envelope. The final voltage is V when idling. A toroid, self-shielding datashret of its low external field, facilitates compact construction.
With regard to HF, the print board should be mounted insulated from the chassis with insulating spacers. He found it a very stable design that also showed no strange phenomena.
After band changing, only two capacitors need to be tuned. The quiescent current at V was about 11 mA. A 5 cm piece of 1 cm diameter will do, longer is OK.
Short-circuit one or more for a standing current of about 20—25 mA. Resistor R1 grid leakage resistance provides a rectified ddatasheet voltage which is proportional to an instantaneous screen grid voltage.
As a rule, dagasheet individual products of standing current and anode voltage should stay below the maximum dissipation of 35 W per valve. The circuit transforms the anode-impedance. After having re checked the newly built linear, the transceiver, a dummy-load and a power meter are connected. Resistance Coupled Amplifier Charts: By pressing the switch temporarily the quiescent current can be measured.
If the leakage current and voltage are stabilised may take 30 minutesthe supply voltage can be raised datsheet the intended working voltage, which should be lower than the nominal one. The contact area should be scraped bright as well as the area where the connecting lead is to be soldered.
With enamelled wire of 14—19 SWG, 9 close bifilar turns are made on a 9.
EL Datasheet, PDF – Alldatasheet
In parting, I hope you will operate your product with pride. This also helps in lowering the HF return-path impedance.
Replacing them is much cheaper than replacing valves. After that, the other electrodes can be connected with the valve drawing its idling standing current, without drive for 30 minutes. Top clips are difficult to obtain, but transistor-cooling clips are a good alternative. The LED will light at overdrive.
Can be precautionary mounted.
After having re checked the newly built linear, the transceiver, a dummy-load and a power meter are connected. With 10 W input the output is about – W.
Heater leads and cathode-bias is led through 1 nF feed-through capacitors soldered in the print board. After band changing, only two capacitors need to be tuned.
The internal heating activates a chemical diffusion process, which raises the emission level and also helps restoring good vacuum, thereby diminishing the number of possible “flash over”. LA8LJA has to my knowledge at first tested this idea with an experimental amplifier for the 20 m band.
I leave it to the pro’s to argue about which specific valves should be used in this project; when properly adjusted, every amplifier will behave linearly. The tube is thicker and often is the envelope made of thicker glass, but there is quite a difference in the mutual production. During transmit periods the screen-grid voltage is applied to the base of a Darlington pair which in turn short-circuit the 10 k? Eventually use the individual bias system with a string of diodes in series with each cathode.
The right figure is an example for the calculation of the capacitor in series with 0. A diameter of about 2 cm and a length of 10 cm is satisfactory. By doing so, we best approximate “one-point” ground.
There are various opinions and solutions how to do it, but with a PL it can be relatively simple. However, when miss tuning with full power, the voltage may rise to several wl519 this value and therefore V should datsheet a safer margin.
Keep one hand in your pocket!