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Message |
Ian Iveson
Guest
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 Posted:
Sat Nov 05, 2005 9:01 pm Post subject:
Re: Toroid power in guitar amp |
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Phil Allison wrote
| Quote: | You should ensure that both transformers are adequately specified
so they don't saturate.
** Huh ??
What pig ignorant drivel.
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What's your problem with pigs?
Perhaps you could be helpful and explain under what conditions a
transformer might saturate? Hopefully you can demonstrate that it
can be ignored in transformer specification.
cheers, Ian
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Bob
Guest
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| Posted:
Sun Nov 06, 2005 5:42 am Post subject:
Re: Toroid power in guitar amp |
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On 5 Nov 2005 16:02:00 -0800, "Bret Ludwig" <bretldwig@yahoo.com> wrote:
| Quote: |
Ian Iveson wrote:
Bob wrote
Bend up a simple metal bracket (you do have a sheet metal brake?)
yes, but I was thinking of using a large washer... any problem
with mounting it
between metals? I could always find a large plastic washer if
so... and I do
have some nylon hardware...
Large washers and rubber or dense foam pads seem to be pretty
standard...toroids usually come with a mounting kit. As long as the
clamping load is spread evenly and the mounting doesn't form a
conductive winding.
Modern nonconductive threaded fasteners (not the cheap nylon license
plate or toilet tank bolts) are pretty tough.
|
I have some high grade nylon bolts I got surplus... I should test one for shear
strength and pop-the-head-off strength!
| Quote: | If you bend over a sheet
you can mount it to the chassis very securely through a small slot and
mount the transformer hanging with the supplied washers and the bolt.
Some people use this with a metal bolt but then you are setting
yourself up for a short and/or galvanic problems. A more labor
intensive method is to put the mounting plate up to the transformer and
toroid-wind it on with monofilament fishing line.
There are also outside brackets that work well.
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I've seen some held by a few ty-wraps... depends on the size of the center hole
I guess... |
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Phil Allison
Guest
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| Posted:
Sun Nov 06, 2005 5:43 am Post subject:
Re: Toroid power in guitar amp |
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"Ian Iveson" <
| Quote: | Phil Allison wrote
You should ensure that both transformers are adequately specified so they
don't saturate.
** Huh ??
What pig ignorant drivel.
What's your problem with pigs?
|
** Autistic ones like you.
| Quote: | Perhaps you could be helpful and explain under what conditions a
transformer might saturate?
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** So you have no idea - yet you posted the drivel above ?
| Quote: | Hopefully you can demonstrate that it can be ignored in transformer
specification.
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** You need to justify your idiotic comment first.
........... Phil |
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Bret Ludwig
Guest
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| Posted:
Sun Nov 06, 2005 5:43 am Post subject:
Re: Toroid power in guitar amp |
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Ian Iveson wrote:
| Quote: | Bob wrote
Bend up a simple metal bracket (you do have a sheet metal brake?)
yes, but I was thinking of using a large washer... any problem
with mounting it
between metals? I could always find a large plastic washer if
so... and I do
have some nylon hardware...
Large washers and rubber or dense foam pads seem to be pretty
standard...toroids usually come with a mounting kit. As long as the
clamping load is spread evenly and the mounting doesn't form a
conductive winding.
|
Modern nonconductive threaded fasteners (not the cheap nylon license
plate or toilet tank bolts) are pretty tough. If you bend over a sheet
you can mount it to the chassis very securely through a small slot and
mount the transformer hanging with the supplied washers and the bolt.
Some people use this with a metal bolt but then you are setting
yourself up for a short and/or galvanic problems. A more labor
intensive method is to put the mounting plate up to the transformer and
toroid-wind it on with monofilament fishing line.
There are also outside brackets that work well. |
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Ian Iveson
Guest
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| Posted:
Sun Nov 06, 2005 9:50 pm Post subject:
Re: Toroid power in guitar amp |
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Phil Allison wrote
| Quote: | ** You need to justify your idiotic comment first.
|
"Need"? This is, er, rec.audio.tubes. We don't really need each
other, Phil. Relax and try to enjoy yourself.
It may help you to consider a transformer primary as an inductor in
parallel with a load-dependent resistance.
The current passing through the inductor depends only on the
frequency and voltage of the mains. Hence it is only necessary to
correctly specify those parameters in order to avoid the possibility
of saturation.
However, the definition of saturation is loose. I have seen it
defined as the point at which the current peak is twice the
underlying sine amplitude. That leaves a lot of room for a
transformer manufacturer to manoevre.
You have in the past defined saturation as the point at which the
current peak becomes apparent to the eye when viewed on an
oscilloscope. I argued at the time that the term should be used more
carefully.
Anyway, you can argue that as long as a mains transformer is
specified for use in a particular country then saturation will never
be a problem. Fair enough, but by what definition of saturation?
Do you believe manufacturers all use the same maximum field strength
and the same grade core? Or are some designed to run closer to
saturation than others? And may some, by your loose and admittedly
unacceptable definition of saturation, be designed to run in a
saturated condition?
And does the stray field produced by a toroid vary depending on the
maximum field strength used? Do bigger cores have less stray field?
I can see that being true of EI cores, but wonder in the case of
toroids. Does an air-cored toroid contain its field?
cheers, Ian |
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Phil Allison
Guest
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| Posted:
Mon Nov 07, 2005 5:42 am Post subject:
Re: Toroid power in guitar amp |
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"Ian Iveson"
** = autistic pommy pig.
| Quote: | Phil Allison wrote
** You need to justify your idiotic comment first.
"Need"?
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** Yes - "need".
In order for the debate to go any further.
( snip Ian's autistic drivel )
| Quote: | Anyway, you can argue that as long as a mains transformer is specified for
use in a particular country then saturation will never be a problem. Fair
enough, but by what definition of saturation?
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** Does not matter.
The transformer maker has addressed the issue in his design.
( snip more of Ian's autistic crapology)
............. Phil |
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