[Amps] where to begin

Thu Nov 7 16:45:01 EST 2013

Oh no ... now he's gone and poked the bear again !!

HI HI

73, Dick, W1KSZ

On Thu, Nov 7, 2013 at 2:34 PM, Alek Petkovic <vk6apk at bigpond.com> 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 The construction chapter is outdated, but the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 at 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 at 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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>>>>>
>>>>>
>>>>
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>>
>
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