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 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 satasheet wire or ribbon strip low inductance.

EL Datasheet PDF –

One should reckon with valve diameters differing with different brands: That is much smaller than the usual air-core coil. In addition, the behavior input impedance of the tube changes with a poor VSWR at the input as a result.

Another solution dayasheet to remove satasheet cm of the windings and start again, leaving a gap of 5mm between windings; then check again. The PA has at least an output of Watts on all bands, except 10m and 12 m, where output is down to about Watts.

Off-resonance, hefty currents can flow through the valves! Furthermore it varies during a SSB transmission because the driver the transceiver is delivering power varying between say 0. Cut off a 12 cm long piece of wire and bend it around a piece of pipe 25 mm od. However, the SWR will be higher on some bands, causing a transceiver without built-in antenna tuner to resolutely settle back.


With a good datasheeet and neat mechanical layout, there is no need for the usual parasite killers in the anode leads to stop parasitic oscillations.

These may have to be bend a little for a good fit. This “one-point-ground” is my improved system, which use a short coax cable of which the outer serves as ground strap.

There are still lots of these valves kicking around. The valve will only conduct when the PTT is activated. Short-circuit one or more for a standing current of about 20—25 mA. Even if the idle currents are made equal, the HF-amplification factors are not. ZL1BJQ’s amplifier under construction. Never operate, test or adjust an amplifier unloaded as it may give rise to uncontrolled oscillations and other horrible phenomena! The final voltage is V when idling.

However, when miss tuning with full power, the voltage may rise to several times this value and therefore V should be a safer margin. He constructed not many linear amplifiers, but the last one is this monobander for 10m. This results in lower efficiency through higher circulating current losses and a lowered output at the antenna terminal. Work swiftly; the glue hardens quickly. Not everyone understand the principle of diriving screen grid voltage from the input signal.


Assessment of The Microwave Tube Industryan inside look at what high-tech tubes are used for, why they’re used instead of transistors, what’s in them lots of beryllium! At Watts and a 50 Ohms load, the loading-C has still only V peak across it, so here the spacing could be even less.

If you use 1 – 2 mm diameter tinned copper wire, it will have sufficient skin resistance for VHF. The wire may seem too thin for some currents, but in all my experiments it never burnt through.

EL519 Datasheet

Therefore he is used a S1 to link S2. As has daatasheet stressed before, the valves should be cooled very well in order not to fail prematurely or have a short life expectancy. In the past I have built linear amplifiers in a test circuit, following published schematics or design formulae and copying given values of components.

If any instability occurs fit a suppressor in each anode. Keep in mind that non-professional fuses will blow, as a rule, at 2 times the nominal current.

LA8LJA has to my knowledge at first tested this idea with an experimental amplifier for the 20 m band. The cooling clip keeps the temperature of the top within reasonable limits at high dissipation.

Replacing them is much cheaper than replacing the valve.