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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However, when miss tuning with full power, the voltage may rise to several times this value and therefore V should be a safer margin.
By doing so, we best approximate “one-point” ground. If, after applying power, the linear does not burst into self-oscillation, as evidenced by any RF output, you probably did everything right.
Too high a standing current may cause overdrive, lower efficiency and excessive dissipation when not modulating. The LED will light at overdrive.
EL519 Datasheet PDF
The capacitance of the electrodes to each other including the neutralisation of two anodes is very low for the HF amateur bands. After having re checked the newly built linear, the transceiver, a dummy-load and a power meter are connected. The rectifier and voltage doubling circuit for the common screen grid are based on a Swiss patent of more than 10 years ago.
For safety reasons in my test amplifier, the two switches for doubling or quadrupling the voltage have been replaced by relays, which are controlled by push buttons on the front panel. Explanation the principle of deriving screen grid voltage from input signal.
As modern transceivers have more than sufficient power, the “flattening” of the input impedance may also be obtained by extra loading swamping the input-circuit with a dataxheet or suitable wide band combination, in which excess driving power can be absorbed.
The anode circuit was calculated using a method in one of my other articles. This was not often seen but I am using the toroids more than 25 years in my home made amplifiers. Curve plots for popular current production12AX7’s: When using valves in parallel, we have to consider the individual differences.
The contact area should be scraped bright as well as the area where the connecting lead is to be soldered. The two outer wire ends will go, via capacitors, respectively to earth and, with a piece of coax cable, to the input relay. With a good design and neat mechanical layout, there is no need for the usual parasite killers in the anode leads to stop parasitic oscillations. As mentioned before, any voltage between and V is usable and will determine to a large degree the maximal power output, keeping in mind the datashset idle current s.
Eventually use the individual bias system with a string of diodes in series with each cathode. I therefore based th e amplifier described here on a grounded grid amplifier, using cheap and still easily obtainable valves. With about 5 W drive and beginning with the 80 m band, tune the output-circuit for dqtasheet power.
Normally the anode- or output -impedance is known or can be calculated, or can be taken from a graph. A toroid, self-shielding because of its low external field, facilitates compact construction. The dynamic input impedance during working conditions is often higher.
Valves unused for a long time and even new one’s, should be first warmed up by having only the filaments on, with the correct voltage, for half an hour.
When cooled sufficiently, these sweep-valves are nearly impossible to destroy. This type of linear has many desirable features, including low cost, low component count, stability due to the swamping effect of the passive grid input load and simplicity of the construction.
EL Datasheet, PDF – Alldatasheet
ON5DRE, click too enlarges. Can be precautionary mounted. If accidentally S1 turns off, relay S2 still activates contacts of S1 and S2. This also holds for new ones, as the date of manufacture is seldom known. Adjust for maximal power at A sturdy ceramic wire-wound resistor, datasjeet its resistance wire removed, will make a good former. That is much datashset than the usual air-core coil. This was the basic circuit, however for safety reasons I do not advocate this design for inexperienced home brewers!
EL Datasheet PDF –
Although, in datashset case of the PL, closer to its glass envelope. The valve seems to be virtually indestructible with its performance limited only by envelope temperature.
Repeate the procedure, alternating between loading C and tuning C, till maximum power is reached. In parting, I hope you will operate your product with pride. The valves may be mounted vertically or horizontally, the choice giving more freedom of layout.
To couple the balance output of the anodes to 50 ohms, I had my own S-Match antenna tuner system in mind.
These may have to be bend a little for a good fit. Can’t find it here?