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" •Bigger transformer is a good mains filter. (Device is protected from high frequency pollution generated by dimmer switch, switching power supply, electric motor... and protected from low frequency pollution: your own audio power amplifier!)" ??
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Let me say up front that this is just speculation. With capacitor input power supplies (most) current is passed through the transformer in short duration current pulses 120 times a second (100 in Europe). These current pulses will excite ringing the transformer if the secondary winding isn't properly snubbed (most aren't). This ringing can be seen on an oscilloscope and is perceived as noise. Will the larger core of a "bigger" transformer lessen this problem? Maybe - I'm not a transformer expert. If this is the case, and I'm not saying it is, rather than throwing a bigger transformer at the problem (and throwing away more money) a properly sized cap and resistor across the secondary will solve the ringing problem. Or use a choke input PS which draws current though the transformer more or less continuously.
"It is better to remain silent and thought a fool, then speak and remove all doubt." A. Lincoln
when DC is present on the mains. DC on the mains will cause buzzing or humming noise from the transformers. Not as noticeable with smaller ones. In some cases, a slightly larger transformer with a slightly higher VA will sound better but not in all cases and it just depends on what is in the gear under upgrading.
I really wish Tweaker would put this crap to rest now. It's been talked about enough. If he wants to put a massive transformer in his gear, then by all means go ahead and be happy. No need to keep coming here every few weeks and stirring the pot!
Actually Cougie, you're the one who brought up the bigger is better thing under the recent thread on fuse sizing. I just thought I'd follow through on it since you seemed interested in my view on the subject. T456
And don't call me "Cougie" unless you want me to call you something back that you will not like. You may like being sarcastic as you have said yourself but I don't. So Let's not go there! This forum is to learn not to start debates just for debates. Everyone has their own opinion and you most certainly have yours, but everyone is tired of the "bigger is Better" debate now. Just move on and tweak your gear like you want.
You should listen to a lot of the people here that have a lot more experience than you and I. Learn from them as I have. I do have my own opinion/s but I still respect their advice. I have learned a lot from the members here and have taken some heat as well but I understand where they are coming from.
Bigger is a meaningless metric. Transformers are not rated on how "big" they are but on the voltage and current they produce.
A - The power transformer's sizeTry this first experience: take a small current device (solid state or valve) as preamplifier, dac, phono stage...
Listen it (I guess the original transformer is a 50VA).
Take the same device and change only the transformer by a 160VA. Listen it.
Now, you can change the transformer by a 300VA and listen.
Step by step with this experience, the sound's quality increase. Indeed the sound is less metallic, more natural, your amplifier seems to be powerful and low frequencies are more present... Why do devices which need only 10W, sound better with a 300VA transformer than a 50VA transformer?By increasing the transformer's size, lots of things change:
The self is a tank of energy,
It works easily and faster,
Bigger transformer is a good mains filter. (Device is protected from high frequency pollution generated by dimmer switch, switching power supply, electric motor... and protected from low frequency pollution: your own audio power amplifier!)
Eric Juaneda is trained in electronic and is or was a designer of audio electronics, according to his website
Edits: 10/19/16 10/19/16
Depending upon the current consumption of the "10W" circuit, a "50VA" transformer may well be insufficient in the first place. The circuit could be current-starved by such a transformer. In which case, it would be no wonder that the 300VA transformer would sound better. Much better.
... I suspect that what he means by bigger, and the basis of bigger that I am interested in is in a larger transformer of the same type, made in a very similar way with higher VA rating. Not comparing different types of smaller or larger transformers to each other. This thesis, of lower noise with a higher VA transformer of the same type is his thesis, not mine. T456
It is irrelevant whose "thesis" it is. The point is a simple one: bigger is not a metric with which we measure power transformers.
If the hypothesis is that a power transformer with a higher VA rating will allow less noise into a system then you need to state it that way.
That's what I just did. Bigger= higher VA of the same type of transformer. What more do you want?
> > What more do you want?
For you to stop posting all this crap that you found on the internet, and acting as if you know what you are talking about.
No chance of that though.
False, like just about everything you post.
The performance of a mains transformer with regard to it's high freq filtering is down to the design, with torroids being worse than say split bobbin or R-core.
No. Isolation transformers will knock It out but some noise is airborne not just in the AC line as you know.
ET
"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936
with a 500VAMy 100W amp has been connected to a custom 3kVA Avel Lindberg toroid isolating transformer. Just to see if there is any difference, I connected it to a 500VA EI.
The Avel sounds a lot better?
Why? Source impedance? Damping? Who knows?
Bigger does not equal better.
a physically larger transformer could be larger for many reasons-
Happy Listening
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