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In the Forum: Melquiades Amplifier
In the Thread: R22
Post Subject: I would not do it.Posted by Romy the Cat on: 12/31/2021
Domidaw, I am not sure if I will be wrong if I say that this amp was first electrical device I build also. so I went over the same problem as you are going. trust me I made a number of ridiculous mistakes as well and so many times I call to people to help me to find a bug, it was mostly Dima. What Dima tough me was to from a point when I know what voltage is correct for each step and each part and measure it before and after. sooner or later, I was able to find the problem. I would insist that the circuitry is correct, it was followed by multiple people. it is most likely (above I called it lost in the translation) you made some kind of wrong decision converting the circuitry to 220 volts. Look at the voltage and the secondary of your power transformer and go step by step from there. The secondary of your transformer supposed to have 240V not 280V this is obvious.
So, let presume that you have a wrong transformer, so how to fix it. You can beef up the resistor and to burn excessive voltage there. if so, do not complain that the resistor is getting hot but it is a bit wasteful way to do the things. Also, the biggest problem is that you are driving your input choke at much higher current, way above critical current. I am not sure that your input will work properly in this scenario, so to make things work properly you need to put a resistor to burn before the choke. It will have its own problem as your rectification want to “see” the input choke not a resistor. You certainly can make it work electrically but you need to evaluate how it impacts sound. what is at the schematic is very play calculated in poop chart filter with a minimum current in place end this configuration was tested electrically and sonically. introducing another idle burning resistor will give another variable and I did not investigate it, so I cannot comment upon its Sonic consequences. so, where up to me I would just change the transformer to be on a spot. if you do not want to do it because we have one centralized transformer for entire amplifier then I would just order one extra B plus transformer with correct output voltage. If, as you finish the amplifier you like the sound then it would be withy to order another centralized transformer.
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