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Old 18th March 2007, 04:27 PM   #1
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Default Fully isolated oilbath transformer.

Oil caps? Very good for tubes amp/ preamps.
What about this.
1. 1:1 fully isolated power supply for the whole tube setup.
2. 110v / 240v input to 110v / 240v output @ 30Amps.
3. Fully submerge in transmission oil.
4. How isit giong to sound
5.
6.
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Old 18th March 2007, 08:13 PM   #2
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Ur confused.

Oil in a cap is part of the dielectric material.
It has a measureable effect as a dielectric.
It has a scientific and engineering basis.
The result is that oil caps have a 'sound'.

Oil in a transformer "bath" is not part of the inductive circuit.
It performs two functions:
- prevents dielectric BREAKDOWN (high voltage breakdown) better than air
- permits better COOLING of the transformer

It should have little or no effect on the "sound",

_-_-bear


PS. I have no idea what the idea of your numbered things is at all...
I think ur talking about a high KVA isolation transformer?? If so that has some merits if set up properly.
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Old 18th March 2007, 11:05 PM   #3
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Most significant application of fluid-filled transformers is regarding environment and maintenance.

Oil xfmr can fit same kVA in smaller core/coil package.
Can provide lower maintenance, as it doesn't require cleaning.
Can provide longer life, as the insulation stays drier and cooler (relatively).
Typically has higher BIL ratings due to enhanced dielectric of oil.
Can be used outdoors, due to sealing from environment.

I see no advantages in performance with regards to audio.

If you plan on using an oil xfmr indoors, I am 99% sure UL would require both a biodegradable and low flash point fluid. This rules out just about everything except vegetable oil.

I would say you're wasting your time.
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Old 19th March 2007, 08:37 AM   #4
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Some truly ultra fi guy maybe will find beneficial sound signature due to nice oil dampening of self resonances and the like. Just maybe. All parts have a sound when things are getting under scrutiny. Please don't start an oil immersion rage in the Far East. I can easily imagine a $90.000 Kondo in an oil filled fish tank!
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Old 19th March 2007, 10:40 AM   #5
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Reasons for oil-filled Tx:
1. Improved cooling (Oil conducts heat better than air)
2. Protects Tx from environment (especially in the tropics)
3. Possible acoustic damping?
4. Snob-value - looks neat?

Oil is not a better electrical insulator than air, and there are problems with adequately sealing the unit whilst allowing external connections.
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Old 19th March 2007, 02:31 PM   #6
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Default Oil Bath Trans.

1. It's run cool that for sure.
2. Easy maintenance, as it is housed in a metal casing .
3. It provide better damping from all other electrical equipments.
4. It's very much quieter than the other trans that I have.
5. As for sonic difference . You need one to know the answer.
6. I am running a 5 A unit for my Preamps and I notice the quietness it does to the supply.
7. Over in Asia our local supply is Very2 dirty all sort of noise will creep into the audio passage.
8. My next project 240v 3 phase Out 240V @ 30A 3 Phase
9. Thanks for some of the answer.
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Old 19th March 2007, 02:59 PM   #7
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Have you made this ??

Let's see some photos !!

Andy
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Old 19th March 2007, 04:56 PM   #8
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Oil is a much better insulator than air.

From Radiotron:

dielectric strength

Air - 19.8-22.8 v/mil

Paraffin Oil 381 v/mil

Modern oils used for electrical and electronic applications are better.


What air does better is the dielectric constant.

_-_-bear


---edit: ah nevermind - I misread a post... ha!
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Old 19th March 2007, 09:22 PM   #9
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A small caution: A lot of high-quality vintage transformers, chokes and HV caps used polychlorinated biphenyl (PCB) oils. These compounds are extremely toxic. If you run across one of these devices and are tempted, please be careful. There is some comfort if there are no leaks after all these decades, but a miswiring could result in an overheated transformer and PCBs spewed across your living room. Newer HV devices made with something other than PCBs might say "No PCBS" or "PCB free". PCBs had several trade names that you can find at the bottom of this US EPA page:

PCB trade names

I have a similar fear of mercury vapor rectifiers. Drop one of those in your house and you've suddenly created a hazardous zone.
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Old 19th March 2007, 09:43 PM   #10
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Quote:
Originally posted by bear
Oil is a much better insulator than air.

From Radiotron:

dielectric strength

Air - 19.8-22.8 v/mil

Paraffin Oil 381 v/mil

Modern oils used for electrical and electronic applications are better.


What air does better is the dielectric constant.

_-_-bear


---edit: ah nevermind - I misread a post... ha!

I stand corrected bear! I found it difficult to get exact figures, but it does look like various oils have at least 3x the dielectric strength of air. You learn something new each day
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