Can a toroidal transformer produce all this mess?

[destroyer X]

Several amplifiers, working together this transformer result unstable...and this hell thing made me change a lot of things in my amplifier to face interferences i believe this one have generated.

The interferences, oscilations superimposed, have appeared in several amplifiers...even in the Destroyer Amplifier, the Standard and first one...i had in other amplifiers also, as Aksa 55, Symassym and DHR Turbo.

So, this explains the reason why folks had not troubles with their amplifiers...the main trouble was in my home...not inside their homes...they use to say the Dx Blame ES works fine and stable.

Maybe the transformer is the problem...removed, even the Dx Blame ES, the former one, had worked fine.

I would like to ask someone to explain me these things..if Toroidal transformers can do that, and also if you think i have a bad solder inside...or if i need to shield ...well..this is the first Toroidal transformer i have..... this is something very new to me....i tried several types of filters...but the transformer was the cause.

Maybe the entire Dx Blame ES unstability was because of this damned one!

regards,

Carlos

[Eva]

Toroid transformers exhibit higher winding-to-winding capacitance and lower leakage inductance.

[PMA]

Typical values I measure are about 150pF for EI transformer and 1nF for a toroidal transformer 300VA.

However, I do not experience interferences, oscillations etc.

[destroyer X]

I found anything strange on it.....i have to search for magnetic fields and to find a way to measure the inductance to calculate if i have a tuned circuit....say,... ressonance.

regards,

Carlos

[PMA]

But, the transformer seems to have different construction:

[Mooly]

If you scope the secondaries can you see anything odd... toroidals "pass" mains borne rubbish more easily than EI types.

Very odd... as you know the PSU should have such low impedance (all the caps) that the transformer shouldn't cause a problem.

How "big" is the oscillations you are getting. Very odd indeed. The amp should be immune to such things... but you say it happens on many with this toroid.

[Samuel Groner]

While I have difficulties to understand the exact appearance of the symptoms you're mentioning (what about a scope photo..?) I'd guess that they might be reduced by a proper snubber network for the rectifier. See www.hagtech.com/pdf/snubber.pdf

Samuel

[jez]

I strongly suspect bad wiring practices such lack of star earthing, "ground bounce" due to shared return impedance etc rather than any transformer.....

[wahab]

I never had a problem with such a transformer..
Could it be that it s a faked one with a fake, or very
bad quality core, with very poor magnetic permeability?..

It makes me wonder, since fake electric components is
now a common practice.

[destroyer X]

I have dismounted and re assembled the transformer once again, i have cutted wires and i have soldered new output wires..... so....latter i will try the monster one once again... then, i will make pictures..now i can show...as i found the guilty.

It is interesting...i am sorry very much...but i am sure, because tests made..the transformer was the problem (before i have dismounted and mounted it once again).

I have made audio explaining what happened and sent to 47 friends..if you want the audio inform you personnal adress..it is in English and then in Portuguese.

regards,

Carlos