It would help everyone if the OP would start by answering the questions that have already been asked, even if one or more responses are "I don't know". There is a consensus of comments about the wisdom of using a tube recto in this circuit, and several pieces of advice have been provided without acknowledgment.
My original question was for help figuring out the schematic for the tube rectifier. Other posters have muddled this up with their opinions about using a tube rectifier in the DAC.
I’m not sure why this has become so difficult. I never said that DAC uses tubes. The BP DAC product has a EZ80 rectified power supply. Can any tube guru help me figure out the schematic for it?
We are still, and honestly, trying to figure out what you want. Your original post was not adequate.
No, we need better photos of the PCB, both sides preferably.
There is more than one way it can be done with the components mentioned.
I’m sorry, but we are trying to help you. Unfortunately we have, evidently, no clear idea what you are asking!
It seems that you don’t need a tube rectifier to supply a DAC, unless it is a tube output. So, why do you need a tube rectifier?
Let’s start with a first simple question. What do you want to power with the EZ80 tube. Please be specific. What Vdc and current?
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I don’t have access the the PCB for the rectifier. If I did I could easily figure this out myself. I just thought someone here was knowledgeable enough to know what the schematic would be given the very few components that are clearly on the PCB, the fact that the transformer has center taps that bypass the rectifier PCB, etc.
As well as the fact that the input voltage for the DAC board must be 11-20 volts. And it uses an EZ80 tube. Lots of clues.
Francois G, the DAC board specifies 11-20V dc. Current requirements are unknown. Here is another link to the DAC board: http://sellarz.com/goods/view?no=45
The hostility to my question here is really bothersome. I have been on this forum for years and never had any issues. My original post asks "Can anyone help me figure out the rectifier schematic and the proper component values and voltages for the transformer supplies?" Why has this become so difficult?
The website posted about this...... thing......... is clearly some chinese outfit, and a bit shady looking to me.
Any power supply design MUST start from a specification of the power required.
MUST!!
You have asked "how can I feed people?", but not said how many people or how long.
Is that a TO220 regulator chip on the lower-left PCB?
MUST!!
You have asked "how can I feed people?", but not said how many people or how long.
Is that a TO220 regulator chip on the lower-left PCB?
Scientific wild a** guess would be some type of bias supply. Tube output to a voltage divider to useful voltage??????.
Anybody know of any 12 volt VR tubes?!?!?
Anybody know of any 12 volt VR tubes?!?!?
Things aren't as complicated as people make them out to be. The tube feeds an 8 volt regulator so as long as you give the regulator enough headroom you'll be fine. Figure on 11 volts minimum output and adjust your input EZ81 input voltage until you get your desired output. Maybe simulate it with the maximum current draw that the EZ81 is rated for to be safe.
The sad (or funny part) is that the EZ81 is probably dropping more voltage than its outputting.
The sad (or funny part) is that the EZ81 is probably dropping more voltage than its outputting.