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Old 29th January 2012, 10:47 AM   #2621
Stixx is offline Stixx  Germany
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Quote:
Some says tube rectification will cause the input voltage variation to *any* regulator may result in it dropping out of regulation. That's why SS rectification is more preferable.
I am not Salas, but I can assure that all Salas shunt regs are working perfectly with tube rectifiers.
This has nothing to do with solid state or tube... a tube rectifier drops a certain voltage , so do take that into account.
Get PSUD2 (free) and start fiddling.. just choose your Vin at least 20V higher than your Vout and you won't have a problem...
Regulating to 400V might be borderline and has been answered numerous times, but I'll leave that one to the Master.
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Old 29th January 2012, 06:51 PM   #2622
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Due i need a load resistor totest sshv2 and what value?
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Old 29th January 2012, 07:27 PM   #2623
vgeorge is offline vgeorge  Greece
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If you don't know your target load, 15k is a safe value. Be sure to be more than 5w, better 10w.
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Old 29th January 2012, 08:19 PM   #2624
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Testing dual SSHV2.

Raw supply: 240V ct - AZ1 mesh- 5.4uF -10H (100R) - 47uF -3H (80R) - 220uF -> 254V
20mA CCS, 7mA load (#26 preamp), 220V.

Noise below 1mV (in the other side 2.5mV)!
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Old 29th January 2012, 08:57 PM   #2625
Salas is offline Salas  Greece
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Post some scope screens if you can. You measure on preamp's output, or on the rails? Maybe you got some more 50Hz on the 2.5mV channel? Twist output pairs.
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Old 29th January 2012, 09:19 PM   #2626
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My measuring was on dummy load (30K -3*10K 5W) with dual channel (Kenwood VT-176) AC millivoltmeter (330uV-100V).
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Old 29th January 2012, 09:22 PM   #2627
Salas is offline Salas  Greece
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Ah, OK. Move the mains cable away maybe. Nice proto board work. Do you use SA1381 and SK117? How's drift?
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Old 29th January 2012, 09:33 PM   #2628
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Yes, SA1381 and 2SK117GR (3.7mA, 3.92mA).
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Old 29th January 2012, 09:52 PM   #2629
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OK, fine then. Use 27-30mA CCS if you can. So 20mA goes to the reg alone. Which one of two trimmer you had substituted for fixed resistor? I think I see less than 4 trimmers on the pics.
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Old 29th January 2012, 10:00 PM   #2630
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With variac turned all the way down and only 1.5V on the rail, i already have 22mA of cuurent across test point on sshv2.
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