So i built a gainclone monoblocks with same exact everything between two units but one channel was humming through the speaker while the other was dead quiet. It turned out to be magnetic coupling of the trafo which i was able to solve by slowly rotating the trafo and my ear to the speaker until the hum went away. The trafos are vigortronix todoidal.
Heres where my gripe starts. As a test i also began rotating the trafo on the other channel and it too had a position where it could induce hum to the amp. But that position differs between trafos by about 40 degrees! Which means the windings between the two units are uneven, even tho they are of the same model and was bought together.
Are such deviations in their windings acceptable?
Heres where my gripe starts. As a test i also began rotating the trafo on the other channel and it too had a position where it could induce hum to the amp. But that position differs between trafos by about 40 degrees! Which means the windings between the two units are uneven, even tho they are of the same model and was bought together.
Are such deviations in their windings acceptable?
Also i thought toroids were suppose to be low in magnetic fields. This thing hums more than the EI trafos that have been used in exact same build.
I dont mean mechanical hum btw. I mean magnetic hum thru signal coupling
I dont mean mechanical hum btw. I mean magnetic hum thru signal coupling
Homogeneously-wound toroidals should have no external stray fields. In addition, when primary and secondary are not perfectly overlaid, the transformer will generate an additional stray field proportional to the loading.
Good transformers are practically devoid from such flaws
Good transformers are practically devoid from such flaws