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Customer Review

70 of 78 people found the following review helpful
3.0 out of 5 stars Basically, good information. Some misinformation though., April 23, 1998
This review is from: A Desktop Reference of Hip Vintage Guitar Amps (Paperback)
Gerald Weber has build guitar amps for years, the Kendrick Amps. These are copies of the original Fender tweeds. He's also built a few amps of his own. However, he's really no expert on the real issues as they relate to tube amps, even though he has a lot of good information.

Here are some examples of the misinformation I found in the book:

He states, in the first chapter, that the reason tubes amps sound so good, in the early days, is the fact that they used diode tubes in the early supplies. When current was drawn across the tube, it developed a voltage drop which causes the output tube voltage to sag, thereby causing a mid-rangey distortion type.

While the action (dropped voltage across the output tubes) is true, the explanation behind it, is not.

The real issue, here, is the fact that the power supplies, back then, were not stiff supplies. They didn't have enough capacitance in the output filters to compensate for loading issues (i.e. instantaneous current draw). The newer supplies are much "stiffer" and they regulate better. A solid-state supply could be made to match the older vacuum tube supplies.

There are other obvious electronic explanations, in the book, that do not follow real physics and/or electronics models. What he is saying about the final result in the amplifiers sound quality and operational charactaristics is correct, however, the explanation of how it really works is not correct.

If you're into vintage amps, modifications, or just building one from the schematics Gerald has done an awesome job compiling information. He's got great, readable schematics, layout diagrams, etc. in the book. It's a bit biased toward Fender, however.

He also has some great historical information, as it relates to the Fender amps, as well.

Overall, I think the book is good. It's just hard to read because of the indescrepancies in the electronics section.
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Showing 1-3 of 3 posts in this discussion
Initial post: Nov 6, 2008 12:26:54 PM PST
hatredguy says:
You mean like "indescrepancies" in spelling make things hard to read?

Posted on Nov 17, 2010 5:52:41 PM PST
For Darwin Kornowski,
Mr. Webers explanation of voltage sag in tube rectifiers is dead on. It is however, written in simple language. His bias toward Fender is well founded, as these amps were the basis for so many later tube amp designs, including Marshall.
Great book!
Curt Christiansen

Posted on Jan 24, 2014 9:42:41 AM PST
JK808 says:
"indescrepancies"...? You must be good in "real physics".
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