My earliest is 1963 -- although the ARRL did send out a repro copy of the first handbook (1926) as a commemorative.
There was an older ham guy in our neighborhood that gave me a bunch of tube stuff books and old radios when I was a kid. That's where my old ones came from. I still have them. I think I have some from the 50's somewhere in a box. I had all the old books stored in my warehouse, which I recently cleaned out. I took several boxes full of old books to "friends of the library". They are supposed to find new homes for them. The paper data books for chips that no longer exist and manuals for MS DOS 2.1 and Windows 1.1 (remember GEM 1.0) went into the recycle bin!
Graphics Environment Manager was a Windows like GUI before Windows existed. I had forgotten about it until I found the books. I had every version of OS2 also.
I got my copy yesterday (from Amazon). It smells funny.
So far, I'm loving it though! This is my first exposure to this book in any edition.
So far, I'm loving it though! This is my first exposure to this book in any edition.
The Kindle version is still the 3rd edition. The 4th ed. appears to be "dead trees" only. For the last while I've switched to only buying paper books if I have to. I've gotten to used to the ability to search and to fit a zillion books on one small device.
I've been putting my tube and component data sheets in Calibre where I can search on metadata.
BTW does anyone know what is new in the 4th ed.?
The Kindle version of the 4th edition has been available for several months. I have it on my phone and my Google tablet. I still prefer the dead tree version for use in the "reading room", so I got one of those too. Smell funny? I wouldn't notice!
I have been skimming through it looking for new stuff. The theory and "why" stuff seems to be better explained, and there is more detail than the 3rd ed, but it's been several years since I read through the entire 3rd ed.
Look in Vol 3 of "Linear Audio." You DO have Linear Audio, right?
(there's a Marx Brothers scene in Horsefeathers which comes to mind...)
What you say is what I expected. But I don't see it.
Did you order it from Amazon? I search for it and got this
Amazon.com: Valve Amplifiers, Fourth Edition (9780080966403): Morgan Jones: Books
Then in the little box where it says "formats" I click "Kindle" and the cover shown is a 3rd ed cover. I do "look inside" on the Kindle version and the copyright page says "3rd ed 2003"
Would you have a link to a 4th ed Kindle page?
It's in the link you posted. Click the plus sign to the left of Kindle edition and the 4th edition magically appears.
I have both the Kindle 4th edition and the latest printing of the 4th edition softback, I strongly recommend the printed book. I did not find reading the electronic edition very thrilling, although I read it using the Kindle reader I installed on my laptop, and not an actual Kindle which might make the whole thing much less awkward..
I would not hold my breath for a hardcover edition either, I have two of the earlier editions and they are also soft cover - they have held up just fine over the 10 or so years since I bought the first one. FWIW I've never met or talked to anyone anywhere who had a hard cover edition of one of these books, and I don't know whether or not they were ever available..
I would not hold my breath for a hardcover edition either, I have two of the earlier editions and they are also soft cover - they have held up just fine over the 10 or so years since I bought the first one. FWIW I've never met or talked to anyone anywhere who had a hard cover edition of one of these books, and I don't know whether or not they were ever available..
Richard,
That appears to be the first edition which I also have. The 3rd and 4th edition both cover "The Scrapbox Challenge" which is a 6528 based SE amplifier.. In the 4th edition he makes some assertions about SE amplifiers and the merits of global feedback in this application that I do not agree with having done the experiment he hasn't, but I will leave that to you to decide..
The 4th Edition has a lot of other material not covered in the first edition - if there is any one edition you should add to your collection I would have to say this is it. 😀
That appears to be the first edition which I also have. The 3rd and 4th edition both cover "The Scrapbox Challenge" which is a 6528 based SE amplifier.. In the 4th edition he makes some assertions about SE amplifiers and the merits of global feedback in this application that I do not agree with having done the experiment he hasn't, but I will leave that to you to decide..
The 4th Edition has a lot of other material not covered in the first edition - if there is any one edition you should add to your collection I would have to say this is it. 😀
Hemp paper
This will help some of us that are broader than we are long?
So we do not do rag chewing when working on a shoe string but chew our books?🙄
I see that they are using hemp in the paper for this book .........? If I remember correctly then hennep was used for the sails and now they discovered that the price of stuff gets too high Now when the men were hungry and they had nothing to eat they chew on the material and a drug get released that silence the hunger pangs. Now do they want us to not "chew the rag" but now we "CHEW THE BOOKS?"
This will help some of us that are broader than we are long?So we do not do rag chewing when working on a shoe string but chew our books?🙄
Mine has no funny smell and seems to be the same paper as the previous two editions I have.
Good quality paper has a variety of other things in it to give it some heft and make it tear resistant, etc.. Perhaps someone a little closer to the publication industry could weigh in, I know next to nothing about this subject. 😀
Good quality paper has a variety of other things in it to give it some heft and make it tear resistant, etc.. Perhaps someone a little closer to the publication industry could weigh in, I know next to nothing about this subject. 😀
Q := 0.71
Interesting to me in Chapter 6 on power amplifiers included in the new Fourth Edition is a discussion of Loudspeaker Efficiency, Active Crossovers and Zobel Networks. Also there is a reference to a loudspeaker article (2010) here on DIYAudio by Morgan Jones. Not new stuff in the world, however an interesting presentation.
Thoughts extracted by me:
1. Compared to solid state power amplifiers valve power amplifiers have lower power output. Due to the prevalence of SS amplifiers todays typical loudspeaker at the outlet store is smaller and less efficient than during previous days.
2. Solid state power amplifiers have near zero output impedance. Valve power amplifiers have non-zero output impedance. Current production loudspeakers are manufactured to mate with zero output impedance amplifiers.
The new book and DiyAudio article suggest doing equalization, the word digital was used and crossover at the line-level with Class D amplification for below 250 Hz. The DiyAudio article presents the Thiele Small theory and maths to design and build a “high” efficiency Loudspeaker and non-zero output impedance valve power amplifier combo with a Total Q of 0.71.
I think that is very cool outside the factory box kind of thinking.
DT
Interesting to me in Chapter 6 on power amplifiers included in the new Fourth Edition is a discussion of Loudspeaker Efficiency, Active Crossovers and Zobel Networks. Also there is a reference to a loudspeaker article (2010) here on DIYAudio by Morgan Jones. Not new stuff in the world, however an interesting presentation.
Thoughts extracted by me:
1. Compared to solid state power amplifiers valve power amplifiers have lower power output. Due to the prevalence of SS amplifiers todays typical loudspeaker at the outlet store is smaller and less efficient than during previous days.
2. Solid state power amplifiers have near zero output impedance. Valve power amplifiers have non-zero output impedance. Current production loudspeakers are manufactured to mate with zero output impedance amplifiers.
The new book and DiyAudio article suggest doing equalization, the word digital was used and crossover at the line-level with Class D amplification for below 250 Hz. The DiyAudio article presents the Thiele Small theory and maths to design and build a “high” efficiency Loudspeaker and non-zero output impedance valve power amplifier combo with a Total Q of 0.71.
I think that is very cool outside the factory box kind of thinking.
DT
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Sorry, cannot agree on point 2 regarding current production speakers are manufactured to mate with zero output Z amps.
You will find in each of the LS chassis spec sheets, figures for compliance, electrical impedance, and a raft of other parameters.
In addition, to mate there are LS box design programs around for all known chassis models.
In general, a tube amp using 20dB global negative feedback loop, is any easy route to create an equivalent output Z of around 0.2 ohms per output 4-8ohm secondary, i.e damping factor of approx 20. I see absolutely no compatibility issues with well designed tube amps and modern day speakers and I use them all the time.
The LS chassis unit efficiency has always been lousy.
richy
You will find in each of the LS chassis spec sheets, figures for compliance, electrical impedance, and a raft of other parameters.
In addition, to mate there are LS box design programs around for all known chassis models.
In general, a tube amp using 20dB global negative feedback loop, is any easy route to create an equivalent output Z of around 0.2 ohms per output 4-8ohm secondary, i.e damping factor of approx 20. I see absolutely no compatibility issues with well designed tube amps and modern day speakers and I use them all the time.
The LS chassis unit efficiency has always been lousy.
richy
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Richwalters
Yes you can and yes we do use negative feedback if we like. However that completely misses the point. We do not have to. All the SET 300B amplifier users have the option if they like.
The book and DiyAudio article present usable tools to design and build a system with an overall Total Q of our choosing.
That is pretty clever I think.
DT
Yes you can and yes we do use negative feedback if we like. However that completely misses the point. We do not have to. All the SET 300B amplifier users have the option if they like.
The book and DiyAudio article present usable tools to design and build a system with an overall Total Q of our choosing.
That is pretty clever I think.
DT
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