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Old 22nd November 2005, 04:04 PM   #1
gja is offline gja  Spain
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Default drawings vs. schematics

Hi everyone,
I came upon this page
http://www.angela.com/catalog/how-to/Single.6V6.html
and found it very helpfull for beginners because you can compare the drawing which is what you see in reality with the schematics,and thus understand a little more.Does anyone have more links like this to post?Or maybe someone has to object against this method.I know you can find tons of schematics but it is sometimes difficult to imagine the layout,and a drawing shows all the hidden wires.

gja
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Old 22nd November 2005, 04:35 PM   #2
Jaime is offline Jaime  Uruguay
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I am sorry, but I don’t agree.
In the scheme he understands the equipment work.
In the drawing he does not understand. He only makes the connections.

I believe that a beguiner must try to understand a schematic.

best regards Jaime
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Old 22nd November 2005, 04:43 PM   #3
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I would suggest that drawings like the one linked to are useless at best. You really cant tell what any of the transformer windings are, or their phase, or any component values. Any (working)schematic can be made to work with any layout (some better than others, but almost all good wiith propper implementation), but pictures such as the one linked are a recipe for fire and tube distruction.

Learn the symbols and understand the operation of each component or buy a ready made kit.

Good luck, and read a few threads about safety. I'm suer you've read before, tube stuff has leathal DC voltages.
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Old 22nd November 2005, 04:47 PM   #4
gja is offline gja  Spain
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Default yes and no

I agree with what you say,maybe itīs a personal way of seeing things.Actually observing some knowledge applied helps me connect it with the theory but then again thatīs my way of seeing things.Just read the last post while writting this,looks like I am going to get killed here!Learn from oneīs errors or from other peopleīs errors.Understood:not a good idea...
gja
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Old 22nd November 2005, 04:55 PM   #5
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What's your goal? To blindly build things with no understanding of what's going on, or start with something and make mods, change things and hopefully improve on a design or make it better suited for your purpose.

I look around until I find a circuit with a topology that I think fits what I want, then search for other tubes that I thing will better suit my application. Then I make up the layout and wiring diagram and/or circuit board layout.
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Old 22nd November 2005, 05:09 PM   #6
dnsey is offline dnsey  United Kingdom
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I actually find it more difficult to work from a picture.
When building a project, I use a copy of the schematic, and trace over the components and connections as they're installed. A picture is much more messy for that purpose.
OTOH, having built one, if I want another, I'll copy the first directly.
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Old 22nd November 2005, 05:20 PM   #7
Joel is offline Joel  United States
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Hi Gja,

I think the other posters are being needlessly harsh.

I found layout drawings like that one very helpful when I was first starting out. They are a good compliment to a schematic - not a replacement for one. I think a photo of the finished amp is even more helpful.

The key bit of info is transformer orientation, and overall chassis size needed.

Old radio kits and magazine projects in the 20's and 30's almost always had a layout drawing. Some of the Gernsback stuff was really artistic! They were geared towards non-technical amateurs.

Joel
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Old 22nd November 2005, 06:36 PM   #8
gja is offline gja  Spain
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Default before I have to go

Just a quick message before leaving,specially to Brian Donaldson:your point is understood.I am learning and yes,I would like to understand what and why.It seemed like a good idea but am now convinced i was taking the wrong path.Still interesting to hear everyone opinion on the subject,hope it helps others like me.Sometimes lack of time and patience leads us to try and avoid going the harder way.
gja
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Old 22nd November 2005, 06:54 PM   #9
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Looking back, you're right Joel, I did sound a little harsh and judgemental. My Bad.

As I was first getting my feet wet, the socket pin number on the tubes was worthless to me. I needed to know where the anode, cathode, screen and grids were hooked together so I could understand what drove what, and you can't see that with the diagram. Once you have the schematic ironed out, then it's time to consider pin outs and physical locations.

Good luck gja, Don't let our attacks scare you off.
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Old 22nd November 2005, 06:56 PM   #10
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I really don't like working off pics as opposed to having a proper schematic. After all, you might want to change the layout and/or may have to adapt to what you have on hand. As for that particular layout, he has a central circuit board with wires coming from the sockets and going every which way. I don't favor that kind of construction, and would prefer to keep the leads as short as possible.

Furthermore, problems become more apparant from a schematic. Click the image to open in full size.
What happens if the speek is pulled from the jack either accidentally, or because the connection wears out, or by the careless when that amp is running?



Not a good idea.
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