Yesterday I returne original preamp transformer and hum is gone, it seems unlikely that the hum coming from the toroidal transformer and I still can not believe it.
I'd love to see how you are connected DH - 102 MC phono preamp if you can describe it in more detail.
I remover wires from phono 2 inputs and placed input wires from 102 there. I put output wires from 102 to phono button. Power supply wires go to empty holes next to color coded wires on power supply. I just don't know where the mute wires go. And they are shorter than the others. But there is a hum now. I tried going straight to the pcb where the phono input is and bypass the button switch but I get no sound when I do this.
Any Ideas?
Any Ideas?
Are you sure that the DH - 102 correct, it sounds to me you are connected well. You can try to attach it instead PHONO 1 input, output from the DH-102 attach to the point where they are attached C8-R15
"don't know where the mute wires go"
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Almost finished building a new preamp waiting for the Silver Mica and Black Gate capacitor.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Ok. This is basically what I did before and I still have no sound at all. I can put it back running through the switch but I have loud hum when I do.
Why would it work through the switch which id using same input on the board and not work going straight to the board?
My friend made it for me, we used high-quality material look much better than original.
Did he use the toner transfer method? Does he have the file from the PCB software he used? I would like to make a new PCB for mine.
Sulzer-Borbely Regulator
Tried and tested Sulzer-Borbely Regulator Power supply, results are more than good no hum or noise perfectly stable, but I returned the original transformer is much more pleasant to listen to.
Tried and tested Sulzer-Borbely Regulator Power supply, results are more than good no hum or noise perfectly stable, but I returned the original transformer is much more pleasant to listen to.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Last edited:
Everything is clear, but still don't know why do you have hum and no signal. try again all connections must be something.
Okay, thanks. It would be a simple black and white print. As for your new power supply, it looks good. Lot more filtering and cleaning. Just an FYI: Erno Borbely designed the DH-200 and DH-101!