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tony.r - 28 Sep 2003 15:47 GMT

Hi folks

I have completed my quest and found the answer for me.
Here is the outcome of my power transformer information search
http://www.ncable.com.au/~tony.r/Transformer_2_Page.html

The kind people at Hammond come through with info and made it easy to
calculate primary / secondary windings.

tony.r
The whole world is a transformer !
It transforms perfectly good people into a.sholes.

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John Crighton - 28 Sep 2003 23:43 GMT

>Hi folks
>
[quoted text clipped - 6 lines]
>
>tony.r

Hello Tony,
glad to know that you got your information.

Just out of interest, did the Ordean Kiltie formula from John Cox
give similar results to the Radiotron designers handbook formula?

Your original repair had 1000 turns.
Your new calculation has 1224 turns, a 12 per cent increase.
Just for interest, before you scrap the old 1000 turn winding,
note the idling current, just to see the difference.

Sometimes, as a refinement, turns can be added to the
secondary and subtracted from the primary to make up for
the resistive loss in the wire of both windings so that the
"on load" output voltage is close to what is desired.

Did you manage to contact John Cox?
Was he able to help you?

Regards,
John Crighton
Hornsby

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tony.r - 29 Sep 2003 16:53 GMT

Hi John

I did not get in touch with John Cox.

I only used the Radiotron designers Handbook formula.

The 1000 turn primary shorted and burned out so I can not test that unit.

Here is the outcome of my power transformer research.
http://www.ncable.com.au/~tony.r/Transformer_2_Page.html

The transformer has passed its start-up test and is now working at all sorts
of loads in my valve amp.

The transformer is running better that the last unit, the tone and sound of
the amp is cleaner and clearer. I will build more power transformers but
output transformers are next on the list.

tony.r
http://www.ncable.com.au/~tony.r/

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tony.r - 30 Sep 2003 17:45 GMT

Hi John

Resistive loss, yes the formula makes allowances for this and when you
complete the calculations and build the trans and bench test it you see that
the outcome is what you where after.

Here are my calculations.

http://www.ncable.com.au/~tony.r/Transformer_2_Page.html

You can see in the secondary formula allowances are made for losses.

tony.r
still studying

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Electronics Forum / Electronics / September 2003

Resaerch and Find Answers