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Old 9th March 2013, 02:02 AM   #1721
Zen Mod is online now Zen Mod  Serbia
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in that case - be sure that either screw is electrically isolated on one ( even better - both ) ends ..... or that your screen-bell is electrically isolated from bottom of case , so you are not having shorting turn through donut itself

wire in windings is also isolated from core , electrically ..... but not magnetically
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Old 9th March 2013, 03:32 AM   #1722
sakellogg is offline sakellogg  United States
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I like the EEK! Means the same in any language.
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Old 9th March 2013, 04:39 AM   #1723
coils is offline coils  United States
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heres another option for high VA transformers, a cup under the can. Papa also said... somewhere, that he rotates the can for minimal elecrtromagnetic interference.
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Old 9th March 2013, 09:11 AM   #1724
NSP is offline NSP  Finland
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Hmm... I didn't know that there still are possibilities for the electrical loop when trafo center is "metal free", but now that you say it makes sense with the magnetism and all. Well I have to make myself a nylon bolt then.
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Old 9th March 2013, 10:29 AM   #1725
AudioSan is offline AudioSan  Norway
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i think i rather would use a metal bolt and nylon washers on the bottom and on the cover(like the ones you find on speaker binding posts)
it can be hard for the nylon bolt treads to hold down the transformer.
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Old 9th March 2013, 01:25 PM   #1726
jacco vermeulen is offline jacco vermeulen  Netherlands
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Quote:
Originally Posted by sakellogg View Post
I like the EEK!
I'd wait to say that till I was absolutely positive what it means in Serbian.

(Eek me, Z)
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Old 9th March 2013, 03:38 PM   #1727
pcb121055 is offline pcb121055  United States
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Great work on the cover! Would the value of such a cover be to reduce stray fields or the transformer's mechanical noise?
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Old 9th March 2013, 03:45 PM   #1728
jacco vermeulen is offline jacco vermeulen  Netherlands
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Quote:
Originally Posted by massimo View Post
without the right tools
A piece of pipe can be bought by the cm/inch.
The lid can be made with a generic electric drill, a metal file, and patience.

Leaves the acetylene & oxygen bottles, and a lighter.
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Old 9th March 2013, 04:07 PM   #1729
sakellogg is offline sakellogg  United States
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Quote:
Originally Posted by jacco vermeulen View Post
I'd wait to say that till I was absolutely positive what it means in Serbian.

(Eek me, Z)
Uh good point.
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Old 9th March 2013, 04:21 PM   #1730
CanAm Man is offline CanAm Man  United States
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Default Toroid shield

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Originally Posted by NSP View Post
Hmm... I didn't know that there still are possibilities for the electrical loop when trafo center is "metal free", but now that you say it makes sense with the magnetism and all. Well I have to make myself a nylon bolt then.
Another option, to preserve the clean looks of the shield. Use a good silicone to bond the shield over/around the transformer. Silver solder a piece of wire or braid to the bottom edge of the shield, and run it to a good chassis ground (or just let the shield "float", ungrounded, if hum is not a problem). Result is a grounded shield, with no bolts/nuts showing in the top, and with no dreaded "magnetic loop" around the toroid core. Voila.

(Now, back to the "photos" in this Pass amp photo thread!.....)
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