I could detect difference between 220VA and 400VA. Didn't try 300VA yet.
My 220VA toroid had electrostatic shield, so this might affecting things too, but overall the sound from smaller one was smoother, but it seemed to lack a bit of air (or extention) that the bigger toroid offerd. The smaller sounded a bit lean and too polite. It wasn't bad, but it seemed like 400VA was a better overall choice. But maybe because of the shield on the smaller one the 400VA seemed to show a bit of harshness in comparison.
But as long as you are not comparing directly, you like both of them
Which one was better, hard to say, but my partner preferred the bigger one.
My 220VA toroid had electrostatic shield, so this might affecting things too, but overall the sound from smaller one was smoother, but it seemed to lack a bit of air (or extention) that the bigger toroid offerd. The smaller sounded a bit lean and too polite. It wasn't bad, but it seemed like 400VA was a better overall choice. But maybe because of the shield on the smaller one the 400VA seemed to show a bit of harshness in comparison.
But as long as you are not comparing directly, you like both of them
Which one was better, hard to say, but my partner preferred the bigger one.
Nuuk said:
At what stage does a bigger fuse become as useless as a protection device, as having no fuse at all?
Answer:
When the whole thing burns and the fuse is intact.
Toroids are real fuse blowers, because of their big inrush current at power on.
I use a 10ohm/10watt resistor in series with one of the primary wires, and it works fine.
On my 384VA toroid I use a 2.5A fuse.
Without the resistor I would have to use more than 4A so that it doesn't blow at power on.
And that's no protection at all.
Nuuk said:
At what stage does a bigger fuse become as useless as a protection device, as having no fuse at all?
And what kind of protection do you really need?
I imagine bigger fuse is still useful as a protection against short circuit, and this is all I need.
With stereo amp, I'm using two bridges, shared by both channels. I never used separate bridges per channels (except for monoblocks).
This effectively destroys the transformer regulation - you are more than doubling the heat losses on the primary side.
I find the sound contribution of fuses or PS switches unacceptable and none of my equipment has ever been fused. Of course i don't manufacture for other people, have no pets or small children and my wife is smart enough to not get anywhere near (this probably explains how she still survives).
Of course this is all quite mild. I once lived in a house with a 'dedicated' unfused line for the audio 'live' wire and the neutral was supplied courtesy of the central heating pipes. It probably broke dosens of electrical code rules but the sound was incredible
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