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PostPosted: 28 Apr 2010, 11:03 
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Posts: 487
Location: Canada
91lieb wrote:
a basic understanding of electricity and basic component-knowledge helps a lot

Hi.

Yes, without basic electical knowledge is like sailing without course - doing without knowing without doing what. This can be dangerous as electricity can kill. It can be wasteful in money & man-hours due to building it wrongly or inefficiently.

Once one knows the theory, one can build better to get better sonic result.

c-J

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PostPosted: 29 Apr 2010, 23:42 
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Joined: 05 Jan 2010, 21:16
Posts: 680
Location: Las Vegas Nevada USA
dannyd wrote:
Intereted in designing and building my own tube amp. Can you guys recomend some essential reading materials to get me started. Please recomend any other bookss or articles that yout hink would be highly beneficial but may not be considered esssential.

I have never deisgned or built audio equipment before in my life to give you a frame of reference on my esperience.

If the OP is still around to read this, learn about what several hundred volts can do to you if you come into contact with it and understand all the dangers and safety precautions before you start building anything (as a poster above points out). That's job #1

Without a good foundation in the theory of the operation of vacuum tubes and some math skills I'd highly recommend using a circuit that others have already built and tested. There's no shame in using someone else's design. I'm working on two amps, one is the Oddwatt (or a stereo rip off thereof that's going to weigh a ton) and the second is a single ended triode that I "designed" myself if you can call it a design. All I really did was calculate the bias points and choose appropriate resistor and cap values - the rest was another rip off. I also simulated both amps on PSPICE, but that wasn't necessary.

There aren't that many practical designs for tube amps. There are lot and lots of variations on a few general circuit topologies, but when you strip away the superfluous circuitry, the circuit usually boils down to one of 3 or 4 basic designs. There are more than that, but 90% or more of amp designs I would suspect fall into a handful of topologies.

Don't forget to factor in the cost of some basic test instruments when you build your amp if you have none already. A couple of voltmeters with clip leads are a necessity. If you aren't going to touch the meters, leads or probes when taking measurements (AND YOU SHOULDN'T) I don't see why a couple of $10 Chinese cheapie meters wouldn't suffice. That's what I'm using and it's working out fine so far. I wouldn't hold the things in my hand though when testing ANYTHING. I'll hold a Fluke, but not one of these!

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PostPosted: 30 Apr 2010, 01:35 
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Location: Sweden, Båstad
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I wouldn't hold the things in my hand though when testing ANYTHING. I'll hold a Fluke, but not one of these!

I would just like to point out that you should check the voltage category of the instrument first, most quality instruments are Cat III which means the are tested and rated for up to 600V, so if you are using top half of low voltage , i.e. above 600V (50-1000V) or high voltage (1000V and up) circuits you need other instruments.

Electricity can kill you!

/Ebbe

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"I've done this a thousand times befo..." on not voltage testing before getting to work.
"I'm gonna take my time on the next amp....." on First tube project.


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PostPosted: 30 Apr 2010, 07:17 
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Location: Sweden, Båstad
Quote:
Electricity can kill you!


30mA @ 50Hz is widely established as the current required to ensure the death of a healthy person. 25mA will give you really bad burns and can disrupt heart-rythm.

In conclusion: Electricity is very dangerous, treat it with respect.

BTW, danny where do you live? Usually most countrys have a Inspection authority for electricity and the usually have some sort of info flyer or folder for people who are DIYing. It's Elsäkerhetsverket (Electrical safety authority) in Sweden. Otherwise make sure you ask questions if something is even the slightest bit unclear.

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"I've done this a thousand times befo..." on not voltage testing before getting to work.
"I'm gonna take my time on the next amp....." on First tube project.


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PostPosted: 30 Apr 2010, 14:11 
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Joined: 09 Jan 2010, 15:59
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Thanks for all the info and warnings guys. I am in NY in the US. I dont plan on building or designing for some time, i want to read up and research first, I am in no rush to get something built. I will most likely at that point find a kit to build first or someone elses plans and modify to my desire and see how things effect the performance of the unit.


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PostPosted: 30 Apr 2010, 18:05 
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Thats IMHO the best way to go at it, welcome aboard and good luck!

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"I've done this a thousand times befo..." on not voltage testing before getting to work.
"I'm gonna take my time on the next amp....." on First tube project.


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PostPosted: 13 May 2010, 19:13 
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Joined: 10 Sep 2009, 16:06
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Location: Sweden, Båstad
Quote:
Cat III which means the are tested and rated for up to 600V

I'm sorry, my memory was incorrect, cat III (3) is rated and tested for up to 1000V.

Also I will compile the info in this thread and add it to the beginners info thread. http://diyaudioprojects.com/Forum/viewtopic.php?f=9&t=1921

/Ebbe

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"I've done this a thousand times befo..." on not voltage testing before getting to work.
"I'm gonna take my time on the next amp....." on First tube project.


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