Various vacuum tube to be explored

A project log for Vacuum tube game in 21st century

Playing vacuum tube is not so difficult as expected. Let's play great heritage of human being by modern technology!

kodera2tkodera2t 06/15/2019 at 12:334 Comments

I got several interesting vacuum tube. My policy to buy tube is,

This time, the first Geiger-Müller tube is exceptionally expensive (but $20).

It is Russian tube, and I will make Geiger counter someday...

Second one is just a 7-segment VFD. Can we make 7-channel audio amplifier (if ignoring channel isolation)?

Third one is historical "Acorn" made in 1944. We can find lots of VHF and UHF circuit examples. I hope I will make super-regenerative receiver...

Fourth ones are 6D-HH13, dual triode in the last era of vacuum tube made by Toshiba. It has a longer Nuvistor shape, and was utilized in VHF amplifier..

The last one is 5672, a power pentode by Raytheon in 1952. All of them are around 500-800JPY in Japan. So still lots of vacuum tube is available, and I guess LPC810 will be available for coming tens years..?


Cees Meijer wrote 06/15/2019 at 19:11 point

Nice. Brings back memories. Even though I'm too young to have actually worked with tubes, my father used to have a television / radio repair shop and he always stocked boxes full of them. When he passed away I think we just cleared out the workshop and put them all in the garbage bin...

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kodera2t wrote 06/16/2019 at 03:25 point

Oh... ok. But also it is true vacuum tube is a kind of garbabe, I admit, because if we just focus on performance vacuum tube has no way to beat semiconductor devices. Now I am exploring how and why the vacuum tube operation. thank you for interest!

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Ken Yap wrote 06/15/2019 at 13:11 point

Great, looking forward to more fun stories.

Have you seen many tubes with metal bodies? I remember having one many years ago. I think there was a glass tube inside but the metal was for shielding. Like your nuvistor but the metal was black and solid.

You ought to do an article on all the pins and sockets you have. The most common were the big octal socket, then the 7 pin heptal and the 9 pin noval. I had a few European rimlock tubes. I gave up tubes before I encountered ones with leads, though I have some nixies and VFDs.

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kodera2t wrote 06/16/2019 at 03:23 point

Yeah right, plenty of pins exists. But my one additional personal policy (at this moment) is no GT, ST and more. My interest (of this moment) is limited to MT, sub miniature and smaller. I know ST GT and more ancient has more wide sea of interest, but I dare to limit.... 

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