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PSU for 6N13P tube
PSU for 6N13P tube
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Old 23rd March 2018, 10:30 PM   #41
indaco is offline indaco
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Ok, I'll try for some measurement.
I've used the IRF822, the IRF740 and the 2SK3567 (this one is an old mosfet I think but the one working "better" than others).
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Old 24th March 2018, 12:08 AM   #42
GoatGuy is offline GoatGuy  United States
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Well, for “starters”, the 2SK3567 has a bipolar zener protecting the gate from excessive gate-source voltage. The VMAX of that is 30 V. Its hard to kill it in practice.

Looking up the IRF740 you have http://www.vishay.com/docs/91054/91054.pdf … and its micro-diagram doesn't have the protective Zener. Blow the gate oxide, and there goes that parade. Its a biscuit.

The IRF822 only has a 20 volt gate-source absmax rating. And no zener. I've gotten so used to deploying fully protected ("faultless") MOSFETs that I've dropped including protection circuitry for them in diagrams. Both of these may be blown devices, now. The 2SK3567 will likely still be good.

Again, measure a few voltages.

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Old 24th March 2018, 01:36 AM   #43
indaco is offline indaco
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Okay, I tried again but it seems working with IRF740 (I used a 12 volt zener G-S). Output voltage increasing until 181 V (with 200k/200K voltage divider). Input voltage is 370 V coming from two RC after diode bridge. The strange thing is that load resistor here must be high, that is > 50k instead 33k otherwise my multimeter becomes "crazy" and doesn't show any number on the display (as it's off range). What could be it?
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Old 24th March 2018, 08:08 PM   #44
indaco is offline indaco
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Ok, I think I resolved through the LR8N3 regulator with mosfet + current limiter. It's a nice circuit, stable voltage at 175 V - 100 mA and the only device to cool is the mosfet with a suitable heatsink.
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Old 25th March 2018, 12:47 AM   #45
GoatGuy is offline GoatGuy  United States
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Well, that works too. Good call.
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Old 26th March 2018, 01:02 PM   #46
indaco is offline indaco
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In wich section can I post some photo of my DIY amp related to this PSU? It was just set to work, but must be finished.
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Old 26th March 2018, 02:14 PM   #47
Lingwendil is offline Lingwendil  United States
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PSU for 6N13P tube
You can post it on this thread, just upload the pics to the post.
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Old 26th March 2018, 06:53 PM   #48
indaco is offline indaco
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Here some picture
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File Type: jpg 20180326_184846.jpg (508.8 KB, 24 views)
File Type: jpg 20180326_202947.jpg (915.0 KB, 22 views)
File Type: jpg 20180326_202914.jpg (769.5 KB, 21 views)
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Old 26th March 2018, 07:27 PM   #49
indaco is offline indaco
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Sorry for the wire mess in the first picture At the end I used a BU808 as voltage regulator (as capacitance multiplier) because I shorted the LR8N3 by an accident on the breadboard.
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