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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At W output the valves would also dissipate nearly W intermittently. Note ifyou already have an RCA tube manual, and if the tubeslisted on the RCA charts in the back are same as here, the pageswill be the same as what you already have.
The wirewound resistor 10—50? Because of the dissipation and closeness of the power valves, a heat-resistant coil former is a must: In constructing the cabinets, I have learned to first make the holes for the valve sockets in a sheet of single-sided print-board and wire it completely, with sockets on the bare side and the resistors, decoupling caps, grounding strips and the 4: The cooling clip keeps the temperature of the top within reasonable limits at high dissipation. Because the control grid is loaded with a resistor, the amplifier is in principle stable.
Another method of insulation is to cement two flat isolating washers e. With my formula we find as a suitable anode load R a for. Heater leads and cathode-bias is led through 1 nF feed-through capacitors soldered in the print board. The knobs are made with a lath. They especially can withstand high voltages and peak currents. With a 3-way step-up quadrupling circuit, the voltage obtained is sufficient.
In this circuit all grids are at earth potential. In this way, the earth-return connections will be shortest. Modern transceivers only work optimally if they see a near less reflections load.
Too high a standing current may datasyeet overdrive, ell519 efficiency and excessive dissipation when not modulating.
Another solution is to remove 1 cm of the windings and start again, leaving a gap of 5mm between windings; then check again. The specs say a maximum anode voltage of V but they quite happily runs V like the EL on the anode.
After that, the other electrodes can be connected with the valve drawing its idling standing current, without drive for 30 minutes. Now raise dataxheet drive level to 10 W and repeat. Explanation the principle of deriving screen grid voltage from input signal. Can be precautionary mounted. For others it will be a challenge to sort out and realise the circuit-dimensions. The circuit transforms the anode-impedance. Therefore he is used a S1 to link Datazheet.
EL datasheet,datasheets manu Page:1==Logic IC ==[未知厂家] pdf datenblatt – –
After having re checked the newly built linear, the transceiver, a dummy-load and a power meter are connected. Collective and individual bias. After band changing, only two capacitors need to be tuned.
Damping can be achieved by paralleling the hairpin circuit inductor with a non-inductive resistor and by making the inductor from resistive material. 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.
Eventually use the individual bias system with a string of diodes in series with each cathode. LA8LJA has to my knowledge at first tested this datashest with an experimental amplifier for the 20 m band. This also holds for new ones, as the date of manufacture is seldom known.
This wire being tinned, I believe the high skin-resistance helps in preventing parasites. Only after this last adjustment is full linearity achieved. This also helps in lowering the HF return-path impedance. Don’t overloa d them and restrict tuning with full power. The rectifier and voltage doubling circuit for the common screen grid are based on a Swiss patent of more than 10 years ago.
At each valve socket, all six grid-pins must connected to each other and be grounded via one point to a common spot chassis, print-board copper side with short connections of thick wire or ribbon strip low inductance.
Filaments and capacitor in series connected to mains. One may dispute the value of the last decimal, but please consider that it is the average result of many experiments. An adequate choke is a short ferrite rod with 30—50 turns of 25 SWG enamelled wire.
When cooled sufficiently, these sweep-valves are nearly impossible to destroy. Valves should be mounted far enough from reflecting metal surfaces, like shiny aluminium partitions.
In all probability, pure class B or C was then adhered to. I used the both tetrode sections in parallel, with only one classic parasitic suppressor.
That is much smaller than the usual air-core coil.