Tag Archives: vacuum tube

TRANSMITTERS OF DAYS GONE BY

  I miss the vacuum tube. Oh I am not saying the vacuum tube equipment better then modern solid state equipment. If I believed that then I would have to clean out my shack and replace most of my equipment. … Continue reading

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Dealing With Secondary Emission in Tetrodes

As we saw in earlier posts the diode vacuum tube (or valve) became a triode by inserting a grid, known as the control grid, which allowed it to amplify audio and RF signals. The triode had a problem of interelectrode … Continue reading

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The Vacuum Tube Diode

To start understanding the operation of the vacuum tube we must start with the diode meaning two elements or two electrodes. These two electrodes are the cathode and the anode more commonly known as the plate. There is the requirement … Continue reading

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Two Relics from The Vacuum Tube Days – The Acorn Tube and The Lighthouse Tube

As the years passed and radio communications engineers tried to produce transmitters and receivers that would work effectively at higher frequencies. The interelectrode capacitance was the largest limiting factor for the upper frequency a vacuum tube would work. So through … Continue reading

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Ham Radio Power Supplies

There are some Amateur radios today that are sold with the power supply built into them so all you have to do to obtain power is just plug the power cord into a wall socket. With the advent of solid … Continue reading

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Need A jump Start?

In the days of vacuum tube amateur radio mobile installations we had to keep the vehicle running if the radio was turned on or we would have a dead battery very quickly. After many arguments with customers trying to explain … Continue reading

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WHAT IS A NUVISTOR?

From the time Lee De Forest put a grid in the diode detector which he patent in 1906 to build the first audion (what he named the first triode which he patent in 1908) amplifier engineers have struggled to build … Continue reading

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THE TERM DUMMY LOAD DOES NOT REFER TO THE OPPERAOR

A transmitter should never be keyed up without a load.  Normally the antenna is the load but when testing or tuning the transmitter the antenna should not be attached to prevent radiation of a signal unnecessarily.  The dummy load replaces … Continue reading

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OLD HAMS NEVER DIE THEY JUST GO SILENT KEY

It does not seem that long ago when I got my first ham radio license and certainly I don’t consider myself to be one the early radio pioneers.  So when I did some research on early day amateur radio stations … Continue reading

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THE DYNAMICS OF THE DYNAMOTOR

Please use the comment section below to reply.  How many of my readers used a dynamotor to power the finals of their mobile transmitters?  Let me broaden that question; how many have even heard of a dynamotor? Back in the … Continue reading

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