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

1912 Audion

in 1908) amplifier engineers have struggled to build amplifiers with less spurious noise.  An amplifier can not amplify a signal that is much lower then the spurious noise generated by the active device.  This is the noise you hear in an AM radio when it is turned on with no antenna or signal or the noise that can be heard when a public address system is turned on and I don’t mean the squeal caused by the mike getting to close to the speaker.  This is not to be confused with static which is atmospheric noise.

Very high gain amplifiers could be built even in the 1940’s and 50’s but they

were of very little use if the signal to be amplified was so weak that the noise generated by the amplifier covers over the desired signal.

The vacuum tube uses a hot cathode to emit electrons which are attracted to the positively charged anode (plate).  This process generates a phenomenon known as “thermal noise”.   Fortunately solid state amplifiers do not suffer with this problem but in the 1950’s and early 60’s the solid state

Nuvistor

industry was just getting started.  The first commercially available integrated circuit was in 1961 and they were a far cry from what we see today.

As more and more satellites were being sent up so there was a greater need for

low signal amplifiers. In 1958 the last significant receiving tube development was made available by the RCA Company.  This little tube that was smaller then the end joint on a dainty lady’s little finger was called a Nuvistor.  With this new device high gain amplifiers with relatively little noise could be built.

The Nuvistor could probably best be described as a little a vacuum tube in a metal can.  They were developed mostly for industrial and professional applications but they caught the attention of some tinkerers, yours truly being one, that were fascinated

with the potential of this newest child of the De Forest generations.

The little tube bridged the gap for a few years and did a magnificent job but the life of the Nuvistor was doomed from its birth as the solid state industry grew and put the foot or hand warming amplifiers out to pasture.

Share on Facebook



This entry was posted in Ham Radio and tagged , , , , , , , , , , , . Bookmark the permalink.

34 Responses to WHAT IS A NUVISTOR?

  1. noText says:

    Great info – very informative will bookmark.http://onlinetvsoftware.net/

  2. some genuinely rattling work on behalf of the owner of this internet site , dead great articles .

  3. whoah this blog is magnificent i love reading your posts. Keep up the good work! You know, a lot of people are searching around for this info, you could help them greatly.

  4. certainly like your web-site however you need to take a look at the spelling on quite a few of your posts. A number of them are rife with spelling problems and I find it very troublesome to tell the truth then again I’ll definitely come again again.

  5. Opera epica in proza in care se povestesc intamplari fantastice puse pe seama unor personaje sau forte supranaturale in lupta cu fortele raului pe care le inving se numeste basm. In proza populara, basmul ocupa un rol deosebit prin faptul ca zugraveste o lume pusa sul semnul fantasticului,.Proza lui Eminescu este mai redusa ca numar decit poezia dar ca si ambalaje plastic in poezie si ambalaje plastic

  6. I went over this internet site and I believe you have a lot of good info, saved to fav (:.

  7. This really answered my problem, thank you!

  8. discover to ll the a This t Glimpse here web and definitely info all about you of know for site it who walk-through didn and ask wanted is you really this…

  9. Tremendous things here. I am very glad to peer your article. Thanks a lot and I’m looking forward to touch you. Will you kindly drop me a mail?

  10. This was a great post, thanks for the info….

  11. An impressive share, I simply given this onto a colleague who was doing a bit of similar evaluation on this. He actually bought me breakfast because I discovered it for him.. smile.

  12. canada goose says:

    Generally I don’t learn post on blogs, however I wish to say that this write-up very pressured me to try and do it! Your writing style has been surprised me. Thanks, quite nice article.

  13. very nice post, i certainly love this website, keep on it

  14. My brother recommended I might like this web site. He was totally right. This post actually made my day. You can not imagine simply how much time I had spent for this information! Thanks!

  15. Definitely, what a splendid website and informative posts, I will bookmark your blog.All the Best!

  16. canada goose says:

    Hello.This article was extremely interesting, especially since I was investigating for thoughts on this issue last Thursday.

  17. canada goose says:

    Good write-up, I am regular visitor of one’s website, maintain up the nice operate, and It is going to be a regular visitor for a lengthy time.

  18. Some genuinely choice posts on this site, saved to my bookmarks .

  19. Thank you for another informative website. The place else may I get that type of info written in such a perfect manner? I’ve a undertaking that I’m simply now running on, and I have been on the look out for such info.

  20. ugg boots uk says:

    I have to convey my appreciation for your kindness supporting individuals who really want help with your subject matter. Your very own commitment to getting the solution all over has been wonderfully effective and have really allowed men and women like me to realize their targets. Your new helpful tutorial denotes much a person like me and a whole lot more to my mates. Best wishes; from everyone of us.

  21. I loved as much as you’ll receive carried out right here. The sketch is attractive, your authored subject matter stylish. nonetheless, you command get bought an impatience over that you wish be delivering the following. unwell unquestionably come more formerly again since exactly the same nearly a lot often inside case you shield this hike.

  22. canada goose says:

    There are some attention-grabbing points in this article however I don’t know if I see all of them middle to heart. There may be some validity however I’ll take hold an opinion until I look into it further. Good article , thanks and we would like more! Added to FeedBurner as well.

  23. I see something truly interesting about your blog so I saved to bookmarks .

  24. canada goose says:

    whoah this blog is magnificent i love reading your posts. Keep up the good work! You know, a lot of people are searching around for this info, you could help them greatly.

  25. You should take part in a contest for one of the best blogs on the web. I will recommend this site!…

  26. blog gives quality based content.

  27. More people need to read this and understand this aspect of the story. I cant believe you’re not more popular.

  28. An attention-grabbing dialogue is worth a comment. I believe that you need to write extra on this matter, it may not be a taboo subject however usually people are not sufficient to speak on such topics. To the next. Cheers

  29. That is a great point to bring up. Thanks for the post.

  30. canada goose says:

    Its such as you learn my thoughts! You seem to understand so much about this, such as you wrote the e-book in it or something. I feel that you can do with a few p.c. to drive the message house a bit, however other than that, that is wonderful blog. An excellent read. I will definitely be back.

  31. canada goose says:

    Whats up! I simply want to give a huge thumbs up for the good information you’ve here on this post. I will be coming back to your weblog soon.

  32. canada goose says:

    Hello. Fantastically cool site!! Man .. Beautiful .. Amazing .. I’ll bookmark your blog and engage the feeds additionally…I am satisfied to attain a lot of helpful information here in the post. Express gratitude you for sharing..

  33. Pingback: Eugene Fansler

  34. Hello would you mind letting me know which hosting company you’re using? I’ve loaded your blog in 3 completely different internet browsers and I must say this blog loads a lot quicker then most. Can you recommend a good hosting provider at a reasonable price? Kudos, I appreciate it!

Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>