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|2/28/2005 10:16 AM|
|Ray Ivers||Cool Book: Crowhurst Reprint|
The book is Understanding Hi-Fi Circuits, ISBN 1-882580-38-9, $15 at www.audioXpress.com (#BKAA63). For those who can get past the 'hi-fi' in the title (this book was written in 1957, there's a whole lot of guitar-amp-related stuff in here), this is just an incredible read for anyone who wants to move in the design-my-own-amp direction, or just understand how things work a bit better. You name it, it's here: preamps, power amps, phase inverters, driver stages, feedback, volume control, tone control, loudness compensation, etc. There's nearly zero math, and lots of circuit schematics, charts, graphs, pictures, etc. Four different variations of LTP, a single 9-pin PI with a gain of 1000+, Van Scoyc inverter w/CF drive (Ken?), ultralinear in depth, cascodes, positive feedback drive, variable damping factor, etc.
I have a bunch of Crowhurst and I thought I already had a lot of this stuff, but I didn't. YMMV, but I would have paid the $15 for just two charts; 'Comparative Qualities of Output Circuits', and 'Comparative Qualities of Phase Inverters'. The thing I like the most about Crowhurst is that he's totally realistic and real-world with no pretensions or tweakiness, despite being one of the major players during the 'Golden Age' of audio design.
|2/28/2005 12:40 PM|
I highly recommend this book too. I got it about a month and a half ago and have read it three times already. Too bad Crowhurst isn't around today to give us a "guitar" amp book!
|Book Of The Day||
The Ultimate Tone, Volume III by Kevin O'Connor
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|2/28/2005 2:54 PM|
One of my all time favorite tech writers.. I have his "Audio Design" and it is amazing from cover to cover. You design a power amp from conception (how many watts, how much distortion, etc) to picking the tubes to choosing the circuit, testing etc. I've wanted to scan it into PDF on stick it on the website for years. It connects so many dots.. I agree 100% on his writing style. None of the usual "Look at me, I am so smart" crap with lots of formulas. He was smart enough to look beyond that stuff. You have to understand what's going on to explain it well to laypeople.
Thanks for the tip Ray! I will soon be $15 poorer.
|2/28/2005 6:56 PM|
Cool - I'm glad you guys liked it too. So much was going on back then as far as discovering new circuits and trying new combinations of old circuits to make something better; and having a great writer like Crowhurst walking you through it is just the bomb.
|2/28/2005 9:08 PM|
Looks like I'm spending $15, too - Crowhurst is great!
|3/1/2005 7:12 AM|
Hi Mark -
Thanks for the kind offer! We have a Xerox copier here that will scan to pdf, trouble is finding the time to actually do it and the reality that it will break the book's binding for good. Ideally I'd want to enlarge the pages to 8-1/2 X 11 (rather than the 2 pages per page it would copy to natively) so that folks could print it full duplex and stick it in a binder. I'm going to contact the folks who did the other reprint and see what their plans are. Perhaps they are already planning to add to the reprint catalog..
|3/1/2005 11:33 AM|
I couldn't find the Crowhurst book at Audioexpress. Damn.
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