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Old 3rd June 2013, 01:05 AM   #1
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Default TubeCadJournal PS

I would like to build this PS for a project I'm working on but I'm not sure about something. Here is the description from John Broskie's TubeCadJournal site:

"The single center-tapped secondary can power the entire preamp. The +/-22Vdc rails will feed positive and negative 15V voltage regulators, which in turn will feed the OpAmp and the tube heater string. (The positive voltage regulator can power two 6DJ8 heaters in series with 6.8-ohm 2W power resistor, which will protect the heaters from current inrushes and drop the 15V down to 12.6V. Why the positive regulator? Just about every OpAmp presents an unequal PSRR figure, with the negative power supply connection delivering a worse PSRR, so it is better to burden a positive regulator.) The +60Vdc B+ rail is created by the voltage tripler made up of the four extra rectifiers and power supply capacitors. (Yes, before you ask, the tripler circuit can be replaced by a quadrupler or pentalupler circuit, as they just require more rectifiers and capacitors.)"

I'm not sure where the tube heater string would return to, after the 6.8ohm resistor, on the circuit. Here is a picture of the PS and the regulator circuit. Would it just come back to the ground of the regulator circuit? Thanks.
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File Type: png power supply.png (13.1 KB, 152 views)
File Type: jpg 15V Regulator.jpg (40.8 KB, 146 views)
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Old 3rd June 2013, 01:40 AM   #2
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Neat tripler circuit.

Yes the return is ground.

I would actually put in a separate regulator for the filament.

No a requirement but it is what I would do.

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Old 3rd June 2013, 01:50 AM   #3
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Thanks Dug. Yeah, it's a neat ps. I'm building one of his MC preamps and this ps will work great for it.
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Old 11th June 2013, 02:21 AM   #4
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I was wondering about rectifiers for this PS. I have a few MUR160's. Would that be alright to use or should I go with 1N4xxx series. Is faster better? Thanks.
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Old 11th June 2013, 05:16 AM   #5
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1N400x are 1A average, 30A for 8.3mS surge.

Your circuit may go as high as about 15A surge.

Too close for my liking.

I would go higher in current rating.
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Last edited by DUG; 11th June 2013 at 05:20 AM.
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Old 11th June 2013, 01:46 PM   #6
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DUG, the only other diode I would have would be the 1N540x series, unless I order some. The have a 200A surge rating.
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Old 11th June 2013, 11:55 PM   #7
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IMHO diodes need overkill.

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Old 12th June 2013, 02:42 AM   #8
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Ok. So, based on the schematic of the power supply above, should this work? (It's a crummy picture but I couldn't figure out how to export it out of DipTrace, which I've only just started to use.) Thanks.
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Old 12th June 2013, 10:51 AM   #9
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Is the footprint for your diodes large enough? Hole size?

Measure twice, cut once.
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Old 12th June 2013, 01:19 PM   #10
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The diode size on the pcb was for 1N400x sizes, DO-41. I'll change it depending on the diode I end up with. The big electrolytics were what I already had. I've gone over the pcb against the schematic several times and I think it will work unless someone sees something wrong. Thanks.
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