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Martin A (Normandy, France)

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Piano Servicing, Tuning, and Rebuilding: For the Professional, the Student, and the Hobbyist
Piano Servicing, Tuning, and Rebuilding: For the Professional, the Student, and the Hobbyist
von Arthur A. Reblitz
  Gebundene Ausgabe
Preis: EUR 29,95

3 von 3 Kunden fanden die folgende Rezension hilfreich
5.0 von 5 Sternen Excellent book, 30. September 1999
Having bought a piano - way out of tune - and being interested in knowing how things work, I found this a fascinating book. The author seems to have managed to put several lifetime's wisdom into one easily readable volume.
But don't kid yourself that one quick read will make you an expert piano tuner - "there is no better way to improving your tuning efficiency than to tune several different pianos a day, five or six days a week" is one of the author's tips.
After several days of work [plus the aid of an electronic frequency meter accurate to 1 in 10**6], I have improved my piano somewhat but it is still way off what a professional tuner would achieve in a couple of hours.


Valve Amplifiers
Valve Amplifiers
von Morgan Jones
  Taschenbuch

2 von 2 Kunden fanden die folgende Rezension hilfreich
3.0 von 5 Sternen Good for beginners, but minor misconceptions put me off., 6. Februar 1999
Rezension bezieht sich auf: Valve Amplifiers (Taschenbuch)
If you don't know much about valve amplifiers ['valve' = 'tube' in USA], you will learn a lot by reading this book, which starts from the basics. It is generally readable and easy to understand. In addition to theory, it also covers some very practical aspects the practical [how to cut metal, how to solder, and so on]. The author's style is highly enthusiatic but came across to me as being slightly amateurish.
Its focus is on hi-fi audio amplifiers - it does not touch on valve guitar amplifiers.
What I liked most was the author's down-to earth common sense approach, which he evidently acquired through his training at the BBC. [no nonsense about gold plating your mains fuses here]
What I liked *least* were minor misconceptions and the details he gets wrong here and there. As a few examples, if you took him at his word, you would believe:
- Fitting metal screening to an input valve will shorten its life.
- The B-H curve of a transformer's iron can be treated as the Vin - Vout characteristic.
- The getter in a valve is only effective if the heater is hot before the anode voltage is applied.
Two topics I thought were significant omissions:
- How to measure amplifier characteristics [eg frequency response, power output, distortion].
- How to design feedback amplifiers to get the best performance for a given output transformer.
Troubleshooting [a pretty important topic] is only touched on.
As I said, if you don't know much about valve amplifiers, you can learn a lot from this book and will find it easy to read with lots of useful information. But if [like me] you are put off by incorrect details and a slightly amateurish air, leave it on the bookshelf.
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