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Old 7th July 2005, 05:55 AM   #1
trancy is offline trancy  Slovenia
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Default OT data

Hello all..

- I have local master, who winds trafos, but he know only for mains trafo how to wind..
- for output trafo I must give him exact data how to do it...
- 10K for primar and 4/8 for sec is not enough

So, can anyone tell me for that amp (link) maximum possible data fot OT,

- I dont know what kind of data is needed for good OT



http://tinpan.fortunecity.com/saint...imer/211-se.gif

lp

trens

sorry for my english
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Old 7th July 2005, 08:02 AM   #2
cerrem is offline cerrem  United States
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Oh Boy...Thats a tough one...

I design and wind OPT's ... high powered Single Ended OPT's are not trivial to make if you have not done one before..
If you want wide bandwidth and very good linearity...it's a tough grind..
I prefer E I laminations over tape wound C-cores in these applications....for a number of reasons...
If it weren't for the GAP that needs to be set up....it would be a lot easier to explain....
Most designs are intilectual property of the designer and displaying a winding sheet on the web would be rare..

You would be better buying a SE output transformer....

Chris
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Old 7th July 2005, 12:48 PM   #3
Yvesm is offline Yvesm  France
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Hi Trens,

You may look at :

http://www.dissident-audio.com/OPT_da/Page.html

But some background is needed anyway

No, 10K, 4/8 is not enought ! At least power is missing.
The type of tube and the schemo could be of interrest.

(Your link is dead)

Yves.
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Old 8th July 2005, 09:19 AM   #4
trancy is offline trancy  Slovenia
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thanx for that link Yves..very usefull...

here is schematic:

Click the image to open in full size.


lp

trens
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Old 8th July 2005, 12:03 PM   #5
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a 10k output transformer is even harder to make than say a 300B 3k5 transformer because of the winding ratio.
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Old 8th July 2005, 01:31 PM   #6
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Default Transformer calculator

I can vote the big thumbs up for Yvesm transformer calculator--Works well, but maybe a little pessimistic in its projected results.
Recently used this to make a great set of three O/P Tx for 6c33 valves--great bandwidth, high output, great sound too!

Total cost for three home-made Tx was less than half the cost of one 'cheap chinese Tx' off Ebay!
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Old 8th July 2005, 02:57 PM   #7
Yvesm is offline Yvesm  France
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Thanks Alastair, but I totally agree with Bas.

Those HI Z units are really more difficult to acheive than LO Z ones specially when looking at Hi frequency response.

I'm trying to wind a good one for a 845 (8K load) and it is just .... not so bad.

Look at shots here:

www.dissident-audio.com/SE_845/Scope.jpg

I could live with the 10S rise time but would be happy to remove the step at mid slope
So many things left to learn !

I try vy hard.


Trens, you've not choosen the easiest way !

Yves.
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Old 8th July 2005, 03:09 PM   #8
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Quote:
but I totally agree with Bas.
Mon Dieu!, someone agrees with me!
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Old 8th July 2005, 03:18 PM   #9
Yvesm is offline Yvesm  France
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Quote:
Originally posted by Bas Horneman

Mon Dieu!, someone agrees with me!
What's wrong ?
J'ai encore dit une connerie ?

Yves.
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Old 8th July 2005, 03:28 PM   #10
trancy is offline trancy  Slovenia
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Quote:
Originally posted by Yvesm



Trens, you've not choosen the easiest way !

Yves.

Of course not..... it should be hard to do...result is much sweetier....

lp

trens
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