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kimbal 14th May 2009 04:07 AM

Audio Transformer articles I would like copies of !
 
Hi All;

I would be most interested in any of the articles sent to my email address > kimbalsummers@hotmail.com < or at least the web links for downloading them :-

The Use of Audio Frequncy Transformers -
Book - Crowhurst - Audio Handbook #3 - 66pp. 1953
Excellent overall book on Audio Transformers. Rare.

Input Transformer Design -
Article - Crowhurst - 11pp Audio Engineering Mag. June - July 56
This is Crowhurst at his best !! EXCELLENT ARTICLE !!
Remember Crowhurst was the guy who supplied the design
charts given in the Radiotron Handbook - large 4th edition.

Output Transformer Design -
Article - Crowhurst - 7pp. Audio Enginnering Mag. Sept 56
Once again a SUPERB Crowhurst gem of an article.
Excellent information!

Audio Transformer Design -
Article - Crowhurst - 4pp. Audio Engineering Mag. Feb 53
More Excellent Crowhurst !

Measuring Up an Audio Transformer -
Article - Crowhurst - 4pp. Audio Engineering Mag. Nov 52
Excellent article.

Electrical Adjustment in Fitting a New Output Transformer -
Article - Crowhurst - 5pp. Glass Audio 2-92
Recent Crowhurst always informative.

Audio Transformers Can Be Good -
Article - Crowhurst - 5pp. Audio Engineering Mag. May 56
One of Crowhurst's best, very informative.

How An Output Transformer Causes Distortion -
Article - Crowhurst - 7pp. Audio Engineering Mag. Feb-Mar 57
Another great Crowhurst article in two parts !

Using the Reactance Chart -
Article - H. B. Davis 3pp. Audio Engineering Mag. Dec 49
Quick how to guide for filter design.

Winding Your Own Single Ended Output Transformer -
Article - Jim Flowers - 34pp. Valve Magazine 1997
Excellent, detailed and well written ! Article is in 4 parts.

Transformer Design for Zero Impedance Amplifiers -
Article - Grossner - 5pp. Audio Engineering Mag. Mar 56
Very good article.

Harmonic Distortion in Iron Core Transformers -
Article - Williams, Eastop - 4pp. Audio Engineering Mag. April 51
Very good and hard to find article.

A New 50 Watt Amplifier Circuit ( McIntosh) -
Article - Frank McIntosh - 6pp. Audio Engineering Mag. Dec 59
Yes, the Unity famous Unity Coupled transformer is well covered!

Output Transformer Impedance Matching -
Article - R. Tomer - 1pp. Radio News
Interesting little simplified design chart.

Output Transformers -
Article - James Moir - 9pp. Glass Audio 94
In Depth Output Transformer design and construction !!
Two part article. Reprinted from Audio Engineering, Feb 60

Output Transformers -
Article - James Moir - 9pp. Audio Engineering Mag. Feb 60
This is the original version of this article as it
appeared in Audio Engineering Magazine.

Practical Transformer Design and Construction -
Article - C. Roeschke - 12pp. Radio News 1947
Rare, rare, rare !! Three part article. Practical transformer construction guide.

Optimum Use of Nickel Alloy Steels in Low Level Transformers -
Article - L. Howard - 2pp. Audio Engineering Mag. Oct 50
Interesting guide to shielding transformers.

Output Transformer Design Considerations -
Article - Ayres - 2pp. Audio Engineering Mag. April 53
Quick and easy read.

Transformer Applications -
Article - Ayres - 3pp. Audio Engineering Mag. Nov 49
Another quick read regarding impedance calculations.

Feedback from Output Transformer Secondary -
Article - Ayres - 2pp. Audio Engineering Mag. July 53
A quick overview of this technique.

Transformers -
Article - Arnold Schwartz - 4pp. db Magazine 1973
Good little audio transformer primer.

New Transformer Design for Power Amplifiers -
Article - C. Graham (Faichild) - 4pp. Radio & TV News Nov 56
Design details of the Fairchild 275 Amplifier Output Transformer.

Transformer Distortion -
Article - Dunford Kelly 5pp. - Audio Engineering Mag. Mar 59
Very good article in 2 parts.

Coils, Cores, and Magnets -
Article - Schendel- 7pp. Radio Craft 1946
Excellent diy coil winding info from the
years when some of the best trannies were made.

Determining Unknown Impedances in Transformers -
Article - L. Hippe - 2pp. Audio Engineering Mag. 1950
Handy information here.

Making Custom Transformers -
Article - H. Strand - 9pp. Science and Mechanics Magazine 1960
It's in 2 parts and serves as a good diy and core salvage info here.

Windings -
Chapter, sec. 3 - Annon - 12pp. Web find - Coilwinding
Some useful info here.

Transformer and Inductor Design Manual -
Booklet - Magnetics Technology Center - 39pp.
There is a version of this on the web but this
is a much cleaner scan. It's a handy guide.

Transformer Design & Manuafcturing Manual 1984 -
Book - R. Wolpert 130 pages. Out of Print
Very practical treatment of the whole subject.
Very hands on. This one is out of print but used to be available.

Coil Winding -
Book - Geo.Stevens Manufacturing - 1st ed. in 1954 & 2nd ed. 1958.
Practical how to coil winding book.

Transformers -
Book - Rider Publication No. 166-37 92pp.
Semi-famous and quite rare Rider Transformers book.
Great information.

Wideband Subminiature Transformers -
Article - Steven Temmer - 4pp. db Magazine 1973
Beyer Audio Transformer Design info.

Beyer Audio Transformer Catalog -
Catalog - 19 pp. Very Rare and informative.

Wireless Coils, Chokes, and Transformers -
Book - 185 pp. F. J. Camm - Standard reference
on diy coils and transformers. Good information.

High Quality Communication and Power Transformers -
Superb Paper - E. B. Harrison (Altec Hollywood Years) 12pp.
This is a paper from the Motion Picture Society Journal and it is
an Excellent Paper!! A Must Read !!

Electronic Design Charts -
Book - N. Crowhurst-Gernsback - 1963 -128pp.
Very cool and rare book of design charts for
inductors and transformers. Very handy!!

If any one has any of the above and other intersting stuff on Audio/ Power Transformer design, I would appreciate hearing about it.

Cheers !

planet10 14th May 2009 04:22 AM

AudioXpress recently published some anthologies of Crowhurst's articles -- they may even have some downloadable on their site.

dave

Tom Bavis 14th May 2009 01:53 PM

I scanned the McIntosh article long ago - it's on my web page: http://www.audiophool.cjb.net/Techno.html

lt cdr data 14th May 2009 05:19 PM

I have a good few of those in hard copy, problem is, I haven't a scanner, and I have many schematics I am dying to share with the web, and I can't upload them for the same reason and hosting.

if anyone can help, I would be dellighted to give them the schematics to upload/host, but I am in england

there are MANY commercial worthwhile, its my dream to get them to the public.

kimbal 14th May 2009 09:43 PM

Thanks for your assistant eveyone.

I will look at the above link and see what I need. I'm like most people and copy as much as I can find because many links die out after a few years and the information is no longer available.

As for the 'It cdr Data' I suggest you find a friend who has a scanner on the web, or scan it onto a CD or a USB memory stick.

Alternatively if you can give me an idea of postage cost to send it to my address in Australia (Queensland,4573 post code), I would be willing to do it for you as I have a PDF scanner and the time to do it; but I can totally understand your reluctance to not let the material out of your posession. ( See my email address at the bottom of this post should you go down this path. )

Alternatively find some one on the forums in your own country who you can work with the scan the stuff. The longer its left off the more frustrating it will be for all. Procrastination gets one nowhere.

I'm seriously toying with the idea of making a central website totally devoted to Audio/ power transformer design notes and 'how to' info. There is nothing available, but more and more people are wanting access to the material. Unfortunately the realy good design stuff costs money most cannot afford, because it's copyrighted or you have to sign up to some University-research library or pay for each document you download from IEEE or AES websites; etc.

The material is out there it's just getting it all together in place.

Kimbal

DigitalJunkie 15th May 2009 02:55 AM

Have a look over Pete's site..
http://www.pmillett.com/technical_books_online.htm
Lots of good stuff! :)
You can even send him (sacrificial) books to be scanned.

thevoice 15th May 2009 04:19 AM

Quote:

Originally posted by lt cdr data
I have a good few of those in hard copy, problem is, I haven't a scanner, and I have many schematics I am dying to share with the web, and I can't upload them for the same reason and hosting.

if anyone can help, I would be dellighted to give them the schematics to upload/host, but I am in england

there are MANY commercial worthwhile, its my dream to get them to the public.


I can't help with scanning, hosting can be done, however. I've already got bits and pieces up that would be related, including the copy of Steve Bench's website that everyone seems to be using.

If you can get me PDF's I can get them on the web.

kimbal 15th May 2009 05:38 AM

Quote:

Originally posted by DigitalJunkie
Have a look over Pete's site..
http://www.pmillett.com/technical_books_online.htm
Lots of good stuff! :)
You can even send him (sacrificial) books to be scanned.

Thanks for the link but I have had the whole Pete Millet site downloaded for sometime. Alas there is very little on it about audio transformers, even Pete has told me in his emails he has very little on the subject - just the same old references we all have like the Radiotron Designer's Handbook and a few bits and pieces of Crowhursts more popular audio articles.

I'm seeking some of the harder to get references, such as what I listed at the beginning of the thread.

Basically If I don't have it, it's very unlikely others will - but I will still ask just the same.

tikiroo 17th May 2009 02:13 PM

I have an original copy of "The Use of a.f. Transformers" by N.H. Crowhurst 1953. Price marked in pencil is 4 shillings 9 pence!

If I get a chance over the next week or so I'll scan it.

ccschua 17th May 2009 02:43 PM

Quote:

Originally posted by DigitalJunkie
Have a look over Pete's site..
http://www.pmillett.com/technical_books_online.htm
Lots of good stuff! :)
You can even send him (sacrificial) books to be scanned.


OMG, u have given me the nightmare of becoming a school children again.


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