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Old 27th April 2013, 10:46 PM   #1
M Gregg is offline M Gregg  United Kingdom
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Default Paper insulation for output transformers?

Does,

anyone have any thoughts on paper insulated output transformers?

Better or worse than a standard Tx..for HIFI

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Old 27th April 2013, 11:01 PM   #2
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Could be dangerous if the paper got burnt due to an overload.
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Old 27th April 2013, 11:05 PM   #3
TheGimp is offline TheGimp  United States
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That is the traditional insulating material isn't it?
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Old 27th April 2013, 11:38 PM   #4
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I don't see any problem with paper insulation as long as the transformers are used within spec. I have a few paper transformers (output and power) I still use them and have never had a problem.
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Old 28th April 2013, 09:38 AM   #5
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Paper have lower dielectric constant compared to mylar, polyester, kapton or woven fiberglass used for interlayer transformer insulation. Thus, you can achieve lower stray capacitance and higher resonant frequency.
Apart from organic press-paper (presspan), there is so called Nomex paper (flame resistant meta-aramid), which have both low dielectric constant and high resistance to heat and flame. For transformer insulation I would suggest adhesive tape, 12mm width, 0.1 mm thickness.

PS. Please change subject from "Paper output transformers" to something like "Paper insulation for output transformers", it would more clear on subject.
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Old 28th April 2013, 09:48 AM   #6
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done....edited the thread title....
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Old 28th April 2013, 09:49 AM   #7
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Quote:
Originally Posted by TheGimp View Post
That is the traditional insulating material isn't it?
yes, that is what see from all opt's i dismantled...
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Old 28th April 2013, 10:22 AM   #8
M Gregg is offline M Gregg  United Kingdom
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Ok paper is lower dielectric constant ,

Why don't edcor/others do paper insulated OP Tx's? Is it a cost issue?
I have seen some companies make them for guitar amps..why not HIFI?

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Old 28th April 2013, 10:39 AM   #9
AJT is offline AJT  Philippines
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sorry, i haven't seen one by Edcor's...that ones i have seen are those from the Dyna amps, Eico, etc....i am unable to comment...

i have a friend in manila who uses nomex, and even teflon sheets...
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Old 28th April 2013, 11:30 AM   #10
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Quote:
Originally Posted by M Gregg View Post
Ok paper is lower dielectric constant ,
Why don't edcor/others do paper insulated OP Tx's? Is it a cost issue?
I have seen some companies make them for guitar amps..why not HIFI?
Yes, Nomex is 4x more expensive compared to mylar or polyester.
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