I have recently finished constructing an F5 amp . Initial testing revealed a
substantial 50 Hz hum . I worked out it was coming from the transformer and built a separate power supply . Amp is now free from hum and hiss and is performing very well . Should I be content or could I reestablish single chassis
amp mounting the Toroid in a cast aluminium box .
substantial 50 Hz hum . I worked out it was coming from the transformer and built a separate power supply . Amp is now free from hum and hiss and is performing very well . Should I be content or could I reestablish single chassis
amp mounting the Toroid in a cast aluminium box .
Do you have pics of toroid in the chassis?
Did you leave an air gap around the circumference of the transformer?
Did you try twisting the transform slight and observe if the level of the hum changes?
Did you leave an air gap around the circumference of the transformer?
Did you try twisting the transform slight and observe if the level of the hum changes?
Reply to feedback
I do not have a photo , the transformer was initially mounted horizontally
I tried mounting vertically , with no reduction in the hum . Then hand held vertically and rotated with no decrease in hum level . The transformer was isolated from the chassis with neoprene washers except for the mounting bolt .
I have purchased a die-cast alumina box (Al+Cu+Zn) and will install the transformer within .
I do not have a photo , the transformer was initially mounted horizontally
I tried mounting vertically , with no reduction in the hum . Then hand held vertically and rotated with no decrease in hum level . The transformer was isolated from the chassis with neoprene washers except for the mounting bolt .
I have purchased a die-cast alumina box (Al+Cu+Zn) and will install the transformer within .
F5 build progress
I have reestablished onboard power supply . The amplifier is happy as am I ,
the 50 Hz hum was caused by a dry joint between circuit earth and chassis
earth . The amp is now noiseless , no 50hz hum and no residual rectification
noise (100hz) .
Keith
I have reestablished onboard power supply . The amplifier is happy as am I ,
the 50 Hz hum was caused by a dry joint between circuit earth and chassis
earth . The amp is now noiseless , no 50hz hum and no residual rectification
noise (100hz) .
Keith