100 valve amplifiers: A history

Ampdog

AVForums Grandmaster
Joined
Aug 27, 2006
Messages
7,611
Reaction score
455
Location
Pretoria, South Africa
A must-read for valve afficionados.

I have just received the following most valuable reference from Skollie. A unique history of valve amplifiers since the beginning in two parts. I am indebted to him (he has also contributed!).

100 power amplifiers to lift your hat ? preface.

F_D may consider to make this a sticky. I will not comment now, except to say that it is a remarkable history for everybody interested in the development of valve amplifiers since the beginning of electronics (before even my time!). Many matters are put in perspective.

I distinctly appreciate correctly explaining the innovation of ultra-linear topology, which at the time was with respect, a sad opportunistic piece of deceit without giving credit where it was due.

I personally, who was part of this history for six decades, take my hat off to those who pioneered.

UPDATE:

New Link:  100 power amplifiers to lift your hat ? preface.
 

Micron

AVForums Grandmaster
Staff member
Moderator
Joined
Mar 29, 2015
Messages
3,139
Reaction score
231
Wow. I've been looking for something like this. Amazing resource. Thanks  :2thumbs:
 

Family_Dog

AVForums Grandmaster
Staff member
Administrator
Moderator
Joined
May 17, 2006
Messages
11,933
Reaction score
967
Location
North West
Seems I have got some reading to do...  ;)

Nice link, thank you Skollie & AD.


-F_D
 

Family_Dog

AVForums Grandmaster
Staff member
Administrator
Moderator
Joined
May 17, 2006
Messages
11,933
Reaction score
967
Location
North West
Thanks El Sid, I have updated the link in the opening post.


-F_D
 

Ampdog

AVForums Grandmaster
Joined
Aug 27, 2006
Messages
7,611
Reaction score
455
Location
Pretoria, South Africa
Ah!  A fresh post here!

Seems then folks are still coming here occasionally ....  ;D

Thanks El Sid and F_D  (Must reread/refresh myself sometime.)
 

El Sid

AVForums Super Veteran
Joined
May 26, 2016
Messages
1,950
Reaction score
369
Location
Jhb
I have been doing a lot of reading up on valve amps, and i understand the basic concepts (or at least I think I do  ;D). IMHO this history shows how valve amps have evolved and converged on a couple of quite easily recognisable topologies. I certainly find them a lot easier to look at/understand than transistor amps, which are a lot more complex and varied from one to the next. I can't wait for my Mars kit to arrive and start playing!
 

marantz123

AVForums Super Veteran
Staff member
Moderator
Joined
Dec 30, 2014
Messages
1,030
Reaction score
219
Location
Pretoria
Another good book I enjoy on basic valve theory and using them in amplifiers is "Basic Electronics" by Van Valkenburgh, Nooger and Neville, inc. Its "Volume 2" in their series. ( 1955, New York) . Topics are "Introduction to Amplifiers, The Triode Tube, Tetrodes and Pentodes, Audio Voltage and Power Amplifiers". Includes different types of coupling and understanding all aspects of valves, eg. transconductance etc. so simply, but effectively. Lovely 3D sketches of valve internals with explanations. 102 pages, A5 size. Red/yellow cover. I havnt searched for an online copy, but hopefully it exists and that you find it.

Interestingly in the Preface, they mention that in 1953, this educational program was introduced and soon after,  25000 Navy trainees had benefitted from the training with outstanding results.

"

The unique simplification of an ordinarily complex subject, the exceptional clarity of illustrations and text, and the plan of presenting one basic concept at a time, without involving complicated mathematics, all combine in making this course a better and quicker way to teach and learn basic electricity and electronics.

In releasing this material to the general public, the Navy hopes to provide the means for creating a nation-wide pool of pre-trained technicians, upon whom the Armed Forces could call in time of national emergency, without the need for precious weeks and months of schooling.

Perhaps of greater importance is the Navy's hope that through the release of this course, a direct contribution will be made toward increasing the technical knowledge of men and women throughout the country, as a step in making and keeping America strong.

New York
February, 1955.
"

This makes me think of the likes of Saul Marantz, David Hafler and the many other greats, once upon a time delving into this technology that was cutting edge then, and bringing the World the best that they could.

Another commonly known publication is Mullards book of Audio Amplifiers, with a few revisions, (I had one of them)  is also very good and an original hard copy is an asset to a valve technology library.

Marantz123.
 

marantz123

AVForums Super Veteran
Staff member
Moderator
Joined
Dec 30, 2014
Messages
1,030
Reaction score
219
Location
Pretoria
Edit :  This may be it...all five volumes in the series.  :clap:

http://sportsbil.com/other/Basic%20Electronics,%20Volumes%201-5,%20(1955).pdf
 

Family_Dog

AVForums Grandmaster
Staff member
Administrator
Moderator
Joined
May 17, 2006
Messages
11,933
Reaction score
967
Location
North West
Those books give a good basic grounding in valve electronics, we used them when I was in 5 Signal Squadron and although basic, they are very well written. Still a good read today, I reckon.


-F_D
 

Den123

AVForums Veteran
Joined
Jan 27, 2012
Messages
411
Reaction score
67
Location
Cape Town
Thanks to Skollie and Ampdog for sharing this "find".
Boy! What a find. An it is so nicely written.
Thanks guys.
 

Qualityten

AVForums Veteran
Joined
Aug 20, 2015
Messages
297
Reaction score
64
Location
UK
I've just revisited these pages. What a wonderful resource, and a nice tribute to Skollie, whose Pye HF25 amplifiers are featured.
 

marantz123

AVForums Super Veteran
Staff member
Moderator
Joined
Dec 30, 2014
Messages
1,030
Reaction score
219
Location
Pretoria
Some bedtime reading..

http://lilienthalengineering.com/100-amplifiers-chapter-1

References to Western Electric circuit designs and schematics may be useful.
 

Family_Dog

AVForums Grandmaster
Staff member
Administrator
Moderator
Joined
May 17, 2006
Messages
11,933
Reaction score
967
Location
North West
Looks like it will be an interesting read, following the intrepid journey of high-quality audio reproduction in the last century.


-F_D
 
Top