It is amazing however that so many buy that snake oil and promote it.
More like full blown gotchas complete with voodoo drums.
Carl
KM1H
-----Original Message-----
From: Carl <km1h@jeremy.mv.com>
To: Joe Subich, W4TV <lists@subich.com>; amps <amps@contesting.com>
Sent: Thu, Nov 7, 2013 5:38 pm
Subject: Re: [Amps] where to begin
"Traps" ?
More like full blown gotchas complete with voodoo drums.
Carl
KM1H
>
> On 11/7/2013 4:34 PM, Alek Petkovic wrote:
> > As is http://somis.org/
>
> Only if one is already technically competent to know the difference
> between sound engineering principles and snake oil. That web site
> is full of traps for the beginning amplifier builder.
>
> 73,
>
> ... Joe, W4TV
>
>
> On 11/7/2013 4:34 PM, Alek Petkovic wrote:
>> As is http://somis.org/
>>
>> 73, Alek
>> VK6APK
>>
>> On 8/11/2013 12:50 AM, Ulf (SM0NOR) wrote:
>>> Gustavo,
>>> The ARRL 2013 is a very good source. Even better is William Orr's The
>>> Radio Handbook. The design chapters are very thorough and easy to
>>> understand. If you get either of the later editions, e.g. 18-23, the
>>> construction chapter is fairly relevant. You can easily find these on
>>> eBay or Amazon at a fair price. The 15th edition is available for free
>>> as a PDF on Internet. Just google it. The construction chapter is
>>> outdated, but the chapters about vacuum tube principles are really good.
>>> A very good source are Ian's, G3SEK's construction manuals to the
>>> triode and tetrode board.
>>> If your club have older editions of Ham Radio Magazine and QST, read
>>> everything about tubes from 1955 an onwards.
>>> Other than that, thee are a lot of DIY projects on internet, just be
>>> careful. Many are good, but many are also lethal in their HV design.
>>> Don't skip the safety chapters! Ian, G3SEK also have an excellent
>>> article on that subject previously featured in Radcom. I think you can
>>> download them from his site.
>>> Like you, I was a beginner 3-4 years ago. Since then I have read and
>>> reread everything above several times. I still know only a fraction of
>>> what other guys in this forum knows, but I'm able to build a decent
>>> amp with good security (I'm crazy about safety). You can too!
>>> And again SAFTEY is paramount - never compromise on it! One of the
>>> first things I took ad notam was G3SEK's words "if you think you need
>>> to do anything inside an amp with the HV on, think again. There is
>>> always another way". So far I have never, ever tested an amp with the
>>> cabinet open. (Only once have I broken that promise. For a photo shot
>>> of glowing tubes I operated it with remote control from a safe
>>> distance).
>>>
>>> Good luck!
>>> 73's
>>> Ulf SM0NOR
>>>
>>> Sent from a wireless device of an unrevealed brand.
>>>
>>>> On 7 nov 2013, at 14:18, Gustavo LU6AGV<lu6agv@gmail.com> wrote:
>>>>
>>>> thanks to all about your replies.
>>>>
>>>> I'll pickup 2013 handbook at a nice discount price.
>>>>
>>>> and I believe that in the club there are a couple of old ones to learn
>>>> a little more.
>>>>
>>>> I'll return latter :)
>>>>
>>>> 73's
>>>> Gustavo
>>>> LU6AGV
>>>>
>>>>
>>>>> On Thu, Nov 7, 2013 at 12:24 AM, Roger
>>>>> (K8RI)<k8ri@rogerhalstead.com> wrote:
>>>>>> On 11/6/2013 8:17 PM, Bill Turner wrote:
>>>>>>
>>>>>> ORIGINAL MESSAGE: (may be snipped)
>>>>>>
>>>>>>> On Wed, 6 Nov 2013 21:31:26 -0200, you wrote:
>>>>>>>
>>>>>>> so, do you have any point, link, etc where I can learn about *Design
>>>>>>> with valves* ???
>>>>>>
>>>>>> REPLY:
>>>>>>
>>>>>> The ARRL Handbook is a good place to start. Nearly everything you
>>>>>> need is
>>>>>> in
>>>>>> there and when you run across something that's not clear, just ask a
>>>>>> question here. Recent editions are usually available on eBay or
>>>>>> amazon.com.
>>>>>> Don't get one more than about three years old.
>>>>>
>>>>> If you also get it on disk, it turns searching for a particular topic,
>>>>> reference, quote, or author from minutes or hours into a few seconds.
>>>>>
>>>>> Although some of the older ones may have tubes/valves covered in more
>>>>> detail.
>>>>>
>>>>> The theory is good, but many of the circuit designs may have a flaw
>>>>> or two.
>>>>>
>>>>> Newer books will have newer material although some of the out dated
>>>>> stuff
>>>>> gets dropped. OTOH they have had a 4CX1600B amp in there for quite a
>>>>> few
>>>>> years. It's a nice amp but the tube was dropped from production
>>>>> years ago.
>>>>>
>>>>> They seem to change very little from year to year, but new stuff
>>>>> does get
>>>>> added so, normally the latest is best and they have been on DVD for
>>>>> quite a
>>>>> few years. You can install the book, or just copy the files and use
>>>>> a link
>>>>> to the beginning to start it or click on setup application.
>>>>>
>>>>> There is an extensive section on Vacuum Tube Basics with the rest of
>>>>> the
>>>>> chapter evolving into amplifier design.
>>>>>
>>>>> 73 and good luck,
>>>>>
>>>>> Roger (K8RI)
>>>>>
>>>>>
>>>>>> Good luck and have fun!
>>>>>>
>>>>>> 73, Bill W6WRT
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>>>>>> http://lists.contesting.com/mailman/listinfo/amps
>>>>>
>>>>> _______________________________________________
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>>
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