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Small 1954 book on amp construction- worth a look.

Discussion in 'Amp Tech Center' started by Bendyha, Jul 24, 2018.

  1. Bendyha

    Bendyha Friend of Leo's Silver Supporter

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    New online.
    127 Bernards Amplifier Manual No.3, J.S.Kendall

    This English book(let) from the Bernards publishers, who printed a long series of books about hobby electronics, was writen with the amateur electonics enthusiast in mind. Only 48 pages, but has a good overall coverage of many basic aspects of tube amp construction, (originaly gramaphone, but largely guitar amp relative) a bit of basic maths, and some aspects not covered in more modern books.

    All in all, worth downloading or reading online, an enjoyable evenings reading for a geek like myself, but a great little overview for those just begining to get into tube amps :D
     
    Last edited: Jul 24, 2018
  2. scottser

    scottser Friend of Leo's

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    cool post - thanks for that, i'll peruse at my leisure later on
     
  3. djh22

    djh22 Tele-Afflicted Silver Supporter

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    Thanks for sharing!
     
  4. aerhed

    aerhed Friend of Leo's

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    Thanks Bendy. Every new course adds height to my anti-stupid wall. Of course, I can still see over it.
     
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  5. Uncle Daddy

    Uncle Daddy Tele-Afflicted

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    Interesting that the cover says 3 foot 6. That's exactly how tall I am laying down.
     
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  6. theprofessor

    theprofessor Poster Extraordinaire

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    Ganz herzlichen Dank, Bendyha! Ich freue mich auf, das Buch zu gucken. Es sieht sehr hilfreich aus.
     
  7. AndrewG

    AndrewG Friend of Leo's

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    Maths (basic or otherwise)? I'm out...:D
     
  8. Gunny

    Gunny Tele-Holic

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    Cool. As a young teen, interested in electronics, I came across a book very similar to this one. I didn't understand more than 1% of it at the time. I did go to tech school to learn electronics and it is my profession, although I made my living in some other technologies (process control instrumentation). I did learn what's portrayed in this book. Electronics today is far more advanced than tube circuit theory so most of what's in this book is not taught now. I never dreamed at the time that vacuum tube theory would pay off for me in modern times. I've built, fixed and modified tube amps for guitar players for quite some time, as a sideline. That old theory made me some nice money. When you fix a tube amp, people think you're a magician. The secret? - the theory never changed; stick to the basics plus acquired tricks of the trade.
     
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  9. OneHenry

    OneHenry Tele-Holic

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    A small possibly useful companion;

    https://www.google.com/url?sa=t&sou...FjAAegQIGBAB&usg=AOvVaw0O2Bkpnci7XGJj_Lr-F2D6
     
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  10. wanderin kind

    wanderin kind Tele-Meister

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    Thanks!! never seen that OPT topology before, with the paralleled primaries, and reverse winding! only 25 mH leakage, gotta try it!

    xfmr 54.jpg
     
  11. Inglese

    Inglese Tele-Meister

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    This is a quite usual contruction for HiFi OT, intereleaving winding works this way.
    Transformer design is a very interesting and obscure argument.
     
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