Simplistic Mosfet HV Shunt Regs - Page 299 - diyAudio
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Old 8th May 2012, 11:34 AM   #2981
regal is offline regal  United States
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Anyone think powering a single feed 2A3 output would be feasable. It would be about 360V*(50ma+20mA) dissipation on the mosfet without the tube running or 18W with the tube pulling, big enough heatsink (8"x3" with 2" fins) should be possible ? Anyone tried pushing this hard?
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Old 8th May 2012, 07:34 PM   #2982
Salas is offline Salas  Greece
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Stressed, it may blow. Especially if it will oscillate on the OPT's inductance. Such tests are at own risk of damaging a reg. Some years ago someone tried with very early SSHV1 type on SE 2A3, worked but he found it too hot and drifting as a system.
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Old 8th May 2012, 10:06 PM   #2983
PET-240 is offline PET-240  Australia
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Curiosity, could two or three be run in parallel with the same trim pot reference or will the differences in parts still throw out the final voltages? What else would be bad?

Thanks, have a preamp for a 6N6P using an interstage transformer.


Thanks again gents,

Drew.
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Old 8th May 2012, 10:17 PM   #2984
Salas is offline Salas  Greece
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There aren't more practical answers than those builds for various purposes that members have shown. Beyond norm, it takes new tries. There can be interactions of all shorts, and HV isn't forgiving, it blows solid state components too easily. Paralleling would change the effective termination impedance provided by the individually employed RC networks for instance.
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Old 8th May 2012, 10:35 PM   #2985
PET-240 is offline PET-240  Australia
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Darn that no free lunch saying.......

Thanks Salas!
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Old 9th May 2012, 04:14 AM   #2986
Salas is offline Salas  Greece
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Tests are up to anybody though. Its I try to never encourage non tried before configs just theoretically. Especially with high voltage circuits. A simulation could show paths but again the proof is in the pudding. How much current you need for that pre?
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Old 9th May 2012, 05:11 AM   #2987
PET-240 is offline PET-240  Australia
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Around the 50mA mark at 250-300V max. could be less than this, just depends on eventual operating point.
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Old 9th May 2012, 06:09 AM   #2988
Salas is offline Salas  Greece
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That kind of consumption can be covered by just one SSHV2 or SSHV1. Just set it at 70mA CCS and use at least +20V raw DC input than target output.
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Old 10th May 2012, 04:07 AM   #2989
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Hi Salas

Is it a good idea to replace a 5AR4 by a HV Shunt reg ?

Best regards
Serge
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Old 10th May 2012, 04:32 AM   #2990
Salas is offline Salas  Greece
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SSHV2 has no on-board rectification, it does not substitute any rectifier type, you can combine it. It accepts unregulated DC and outputs regulated DC.
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