A 30W pushpull amplifier based on the 300B direct heated triode output tube. Fully differential driver stage topology, no global feedback, fixed bias amplifier with full voltage regulation. Audio tube complement is a pair of 300B, 6SN7 differential driver stage, and 6SL7 input stage. Topology is long tailed pair. Inputs may be operated in fully balanced or unbalanced mode with no degradation in performance. The power supply features tube regulated B+ and bias supplies. Potential builders should have moderately advanced construction skills, and at least a good DVM for successful construction and debug. Scope and audio generator recommended. This amplifier will drive conventional modern speakers systems quite well. This design was originally featured in a VTV article 10yrs ago.
CEO-Led Sales outlines The Right Model to revolutionise your sales process and dramatically improve your confidence in the predictability of your sales numbers. This has to start from the top with you, the CEO.
As the CEO of a sales organisation, how many times have you said to yourself:
"thank god our customers are buying because we're not selling"
"we had ten-times pipeline coverage, but we still missed our number?"
Or ... heard from your sales leads the following:
"the person who was going to sign off on our deal has gone on leave"
"this is a strategic deal - we must discount to win"
"they decided to do nothing?"
If these lines sound familiar, then your sales team is stuck in the past. They are struggling to keep pace
with the market and will continue to stumble into the future. That's not to say you won't make your
numbers on occasion, but you can be guaranteed your company won't be the clear leader in its market.
This creates distrust with your sales team and that uneasy feeling of not being sure you will meet your
Is there a better way?
After twenty years as a senior IT sales leader addressing this problem and demonstrating measurable
success across multiple organisations, Andrew Phillips knows there is.
CEO-Led Sales outlines The Right Model to revolutionise your sales process and dramatically improve
your confidence in the predictability of your sales numbers. This has to start from the top with you, the
The process is a multi-year investment to transform your sales organisation. It's challenging, but the
results are consistent and the revenue reliable. Andrew Phillips invites you to take the next step and
discover the benefits of CEO-Led Sales.
Written by an author with plenty of experience holding a scalpel, Dr. David Schneider’s in-depth biography is an encompassing history of the practice that has leapt forward over the centuries from the dangerous guesswork of ancient Greek physicians through the world-changing “implant revolution” of the twentieth century. The Invention of Surgery explains this dramatic progress and highlights the personalities of the discipline's most dynamic historical figures. It links together the lives of the pioneering scientists who first understood what causes disease, how organs become infected or cancerous, and how surgery could powerfully intercede in people’s lives, and then shows how the rise of surgery intersected with many of the greatest medical breakthroughs of the last century, including the evolution of medical education, the transformation of the hospital from a place of dying to a habitation of healing, the development of antibiotics, and the rise of transistors and polymer science. And as Schneider argues, surgery has not finished transforming; new technologies are constantly reinventing both the practice of surgery and the nature of the objects we are permanently implanting in our bodies. Schneider considers these latest developments, asking “What’s next?” and analyzing how our conception of surgery has changed alongside our evolving ideas of medicine, technology, and our bodies.
From a discussion of Einstein’s theories to an analysis of meaning, the philosopher offers a fascinating collection of essays on a wide range of topics. This is a collection of many of Whitehead’s papers that are scattered elsewhere. It was the penultimate book he published, and represents his mature thoughts on many topics. Philosophical Library has done a great service by publishing a representative collection of his writings on the subjects of Philosophy, Education and Science. The portion on Philosophy includes five papers: “Immortality”, “Mathematics and the Good”, “Process and Reality”, “John Dewey and His Influence” and the “Analysis of Meaning.” The first three chapters consist of Whitehead’s personal reflections illumined by flashes of his lively humor. They are picturesque and amusing. The remainder of the book consists of chapters on Philosophy, Education, and Science. They cover in depth his positions on many scientific and philosophical matters in an extraordinarily unified way. The final section of the book is devoted to excellent surveys of Geometry and Mathematics as well as a paper on Einstein’s theories.
Homework Helpers: Chemistry is a user-friendly review book that will make every student—or parent trying to help their child feel like he or she has a private Chemistry tutor. Concepts are explained in clear, easy-to-understand language, and problems are worked out with step-by-step methods that are easy to follow. Each lesson comes with numerous review questions and answer keynotes that explain each correct answer and why it’s correct.This book covers all of the topics in a typical one-year Chemistry curriculum, including:A systematic approach to problem solving, conversions, and the use of units.Naming compounds, writing formulas, and balancing chemical equations.Gas laws, chemical kinetics, acids and bases, electrochemistry, and more.While Homework Helpers: Chemistryis an excellent review for any standardized Chemistry test, including the SAT-II, its real value is in providing support and guidance during the year’s entire course of study.
Instructions in how to develop your psychic powers including telepathy, clairvoyance, self-projection, reincarnation, and other topics. Seriously. "It must be distinctly understood … that I believe the vast bulk of the material presented in this book to be sound and helpful; the practical instructions are good, and the reader cannot go far wrong in following them. May he develop his own psychic powers, and gain light and understanding thereby!" (From Author’s Preface) (Summary by Todd)
A tour the force of contemporary social science, written by a futurist at the forefront of technology and change.
Pandemic Aftermath offers suggestions to remedy its consequences, or even enable segments of society to thrive on it. The first portion of the book is non-fiction. The second portion is a scenario-based novel, the book charts new territory by interweaving the grim reality of 2020 with a first-person exploration of the next decade as if we were already in it.
"The informative narrative is well-rounded and well-researched, and the conversational style is easily understood despite the technical jargon of the academic discourse."
-- US Review of Books
"Essential reading for anyone concerned about what that world will look like in the pandemic’s aftermath, and how to operate in today’s environment and survive it. […]
-- D. Donovan, Senior Reviewer, Midwest Book Review
"[...] a read that provides a bounty of information and certainly a large dose of ‘food for thought.’"
-- Feathered Quill
Trond Arne Undheim is a futurist, speaker, entrepreneur and former director of MIT Startup Exchange, based outside of Boston. Trained as a social scientist with a career in technology and innovation, he is the CEO and cofounder of Yegii, a search engine for industry professionals, providing collective intelligence. Trond holds a PhD on the future of work and artificial intelligence and cognition. Undheim is the author of Leadership From Below (2008) and Disruption Games (2020). His next book will be on the future of technology.
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