Difference between Beam Tetrode and Pentode Datasheet in Retro Style

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Hi All!!!

When creating designs for datasheets for radio tubes, I encountered a problem that was not obvious at first glance. The problem was that I could not accurately determine the type of amplifier tube. It would seem that look at the factory specifications and everything will be written there, but that was not the case. Different specifications for the same tube indicated different types. Somewhere it was a Beam Tetrode, somewhere a Beam Pentode, and somewhere just a Beam Power Tube.

After some quick googling, I realized that I couldn’t solve this problem quickly and that I would have to delve deeply into this theme.

As a result, I not only understood what the difference was, but also came to the conclusion that it would be nice to put this into a separate datasheet.

I will show the new design a little lower, but now I want to talk a little more about what I managed to find.

I’ll start, perhaps, with Wikipedia, namely with the pages about the beam tetrode and about the pentode.

Links to the pages:

https://en.wikipedia.org/wiki/Beam_tetrode

https://en.wikipedia.org/wiki/Pentode


What also surprised me was how differently the Wiki presented information about the same topic in different languages.

Compare, for example, the Russian version of the description of a beam tetrode

https://ru.wikipedia.org/wiki/Лучевой_тетрод

and, as they say, feel the difference!


It is not surprising that I wanted to find a more understandable description of the operation of the tetrode and pentode, and even that it was all on one page.

Among the numerous results that the search engine gave me, I would note the following two links:

https://www.ampbooks.com/mobile/tutorials/pentode/

http://www.r-type.org/articles/art-004c.htm


So, at this stage I had the following picture:


A tetrode is a tube that has four active electrodes: a cathode; anode; control grid; screen grid.

A pentode is a tube that has five active electrodes: a cathode; anode; control grid; screen grid; suppressor grid (antidynatron grid).

Suppressor grid is also called pentode grid.

In a beam tetrode, the beam-forming plates are not a grid. They seem to be part of the cathode. Hence the name.

But the question arises: why do some manufacturers call this design a beam pentode?

After wandering around the amateur radio forums a little more, I came to the following conclusion:

Although the beam-forming plates are not a grid in themselves, they are still a separate electrode in the tube design and according to the scheme

5 electrodes = pentode, 

such a lamp can also be called a pentode, but without a suppressor grid. And to make it clear that this is a pentode without an pentode (suppressor) grid, it is called a beam pentode.

By the way, in some lamps the beam-forming plates are not connected to the cathode, but have their own separate output to the outside.

Apparently, to eliminate this confusion, such tubes began to be called Beam Power Tube.

Well, now it’s time to show the datasheet itself.




I also posted a high-resolution image on the Redbubble website; it can be printed both in large format and in small format as a sticker.


Difference between Beam Tetrode and Pentode Datasheet in Retro Style


https://www.redbubble.com/shop/ap/160450781



 

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