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| Tube amp questions |
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| Zero999:
--- Quote from: sahko123 on November 05, 2018, 04:49:03 pm ---Now I have another question not to do with impedance. This question is to do with powering the tubes. I was wondering of I could use rectified mains for the high voltage line and use a smaller transformer just for the filament voltage.(I live in Ireland with a 220v mains) --- End quote --- Yes, that's possible in theory, but it would be very dangerous. Headphones and speakers don't have adequate insulation for mains voltages, so whilst it will work in theory, in practise it's highly likely to cause someone to be electrocuted. If everything connected to the amplifier (both inputs and outpus i.e. microphones, speakers, headphones etc.) via transformers with sufficient insulation between the primary and secondary windings, when such a set up could be safe, but in practise common audio transformers don't have mains rated insulation. |
| sahko123:
If I do go for an olsmpsu it would be in off the shelf module form because this is a one off thing and I would likely be doing this on tag boards rather then fleshed out pcbs in which I could add the circuitry required |
| spec:
--- Quote from: sahko123 on November 06, 2018, 04:56:47 pm ---If I do go for an olsmpsu it would be in off the shelf module form because this is a one off thing and I would likely be doing this on tag boards rather then fleshed out pcbs in which I could add the circuitry required --- End quote --- Essentially yes, the modules are built and off the shelf. I would like to call this approach switching power supplies from now on. OLSMPSU is cumbersome and a tad misleading. When you see my post, currently work in progress, describing the switching PSU approach, all will be clear... I hope. :D |
| spec:
--- Quote from: Hero999 on November 06, 2018, 09:32:55 am --- --- Quote from: sahko123 on November 05, 2018, 04:49:03 pm ---Now I have another question not to do with impedance. This question is to do with powering the tubes. I was wondering of I could use rectified mains for the high voltage line and use a smaller transformer just for the filament voltage.(I live in Ireland with a 220v mains) --- End quote --- Yes, that's possible in theory, but it would be very dangerous. Headphones and speakers don't have adequate insulation for mains voltages, so whilst it will work in theory, in practise it's highly likely to cause someone to be electrocuted. If everything connected to the amplifier (both inputs and outpus i.e. microphones, speakers, headphones etc.) via transformers with sufficient insulation between the primary and secondary windings, when such a set up could be safe, but in practise common audio transformers don't have mains rated insulation. --- End quote --- Wise words H999 :-+ |
| spec:
Attached is a Word.doc summarizing the proposed switching PSU. I hope it explains the approach clearly and answers any questions you may have. :) |
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