[Amps] where to begin

[Alek Petkovic]

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 The construction chapter is outdated, but the chapters about vacuum tube principles are really good.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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