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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Therefore he is used a S1 to link S2. Check it with a GDO for el51 of series-resonance in any amateur band. My favourite choke has a diameter of 2—2. PA3AGF gained the first prize in a home brew contest. That is much smaller than the usual air-core coil. Quite often in the following years, output was raised after tinkering with the output circuit.
Usually I will not reactivate longer than 30 minutes. 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. These should be coated with a dull black heat-resistant paint. The use of panel meters for the various voltages and currents depends on personal choice.
With this last construction it might be even possible to use bare copper wire for the two windings, which face each other, of respectively 7 and 11 turns of 14—19 SWG enamelled wire. A part of the input power is dissipated in a 50? As the control grid is loaded with a low resistance, I think that in this design the tube can also datashete used with even the anodes in parallel, see the proposed schematics.
Eventually L2 can be wound with close trifilar turns on a ferrite rod from an old MF radio or on a ferrite toroid. If, after applying power, the linear does not lift from your desk, you probably did everything right.
Don’t forget the control lead for the relay! This is to prevent too intense IR back-reflection. Across the coil L is the series combination of. ON5DRE, click too enlarges. Both methods have been used in my compact test rig and the first method seems best.
FRINEAR RF Amplifier with 4 x PL(EL)
After ten years or more television service, cathode emission remains near perfect and the PL is capable of sustaining over 1. Let the PA cool for at least 30 seconds after every 30 seconds of transmitting, to keep the valves healthy. Eventual use a pF trimmer for minimising the input SWR in the 10 m band. The net result of this analysis can be an explanation for the still reasonable circuit efficiency in the 10 m and 15 m bands.
This chart shows an example of how toset up voltage-amplifyingpentodes for maximum voltage output as opposed to maximum gain The example givenis an RCA Then supply a “high voltage” of 12 – 15 V and set the voltage to a current of mA. These may have to be bent a little for a good fit.
Nearly all transceivers can deliver about W with such an SWR without an antenna tuner. Modern transceivers only work optimally if they see a near less reflections load.
Hams not having much experience with valves may learn much from this project.
In this way, the earth-return connections will be shortest. The older, valves transceivers wi th pi output tuning datashete not have this problem. This type of linear has many desirable features, including low cost, low component dattasheet, stability due to the swamping effect of the passive grid input load and simplicity of the construction. A toroid, self-shielding because of its low external field, facilitates compact construction. Hams not having much experience with valves may learn much from this project.
At the lower bands the Q is lower see calculationin order to restrict the size and value of the tune- and load-capacitors.
EL519 Datasheet PDF
Mounting them on a metal apron, with short connections to the print board and the tank coil, may work equally well. However, datasheet are in the habit of miss using valves in other than normal ways, so available data don’t apply. After that, the other electrodes can be connected with the valve drawing its idling standing current, without drive for 30 minutes. Short-circuit one or datasheeg for a standing current of about 20—25 mA. However, the SWR will be higher on some bands, causing a transceiver without built-in antenna tuner to resolutely settle back.
What to do, and why you shouldn’t panic. One may dispute the value of the last decimal, but please consider datasehet it is the average result of many experiments. If, after applying power, dl519 linear does not burst into self-oscillation, as evidenced by any RF output, you probably did everything right. It consists of the combined anode capacities of all valves, about 10—15 pF for the tuning capacitor’s minimum and about 4—8 pF for stray capacity.
PA3CLL, click to enlarges.
It has 9 turns with an inner diameter of 25 mm and a length of about 60 mm. By grounding the plus pole of the meter, one can obtain many meter functions with a one-waver switch.