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152.131.10.193
This is utilizing single components..no sharing resistors...multiple rectifiers etc......
Power transformer- 0-800 volts or 400-0-400 volts( do NOT connect center tap!).. 2x or more current rating. Hammond 300 series has some good choices. Get them form Mouser..better prices.
ASC blue line 1200v capacitors. 10 or 50 uf from Parts Connexion.
IXYS VUE30 Solid State Bridge rectifier.( OHHH HOOROR!!!) 2KV/32 amps from Mouser.
Lundhal chokes. Voltage ratings- 2kv between windings/4kv between windings and core. Different configurations for current requirements.
PSUD modeled anywhere between 1040 and 1080 volts depending on current requirements.
So far..no blow ups or outs. I'm using the above recipe for my current 845 project.
Follow Ups:
You can bank on that SS bridge producing its share, and then some, of switching noise. If a filament winding is on the same core as the rectifier winding, put ferrite beads on the filament winding leads, to keep the switching noise from sneaking into the signal path via the filament supply.
Put ferrite beads on the primary leads to keep crud riding on the AC mains out and locally generated crud off the mains.
Search the archives here on AA and over on DIY Audio for my posts about "hash" filters. High current RF parts prevent trash from several sources sneaking into the B+ rail, via the winding capacitance of filter chokes.
Eli D.
Probably lots of ways to skin this cat. Rather than a bridge, you could build a hybrid supply using two strings of HV diodes and a 5R4GYB. That would eliminate rectifier switching noise and also provide a slower warmup for the 845(s). Good luck with the project!
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Buy Chinese. Bury freedom.
The 5R4 is directly heated and turns on almost as fast as SS diodes. Also, the forward drop in 5R4s is large, a whopping 67 V. at a 250 mA. draw.
IMO, hybrid bridges for 1+ KV. B+ PSUs should use damper diodes, like the 6AU4 and 6CJ3, for the vacuum positions. PSU start is very slow and vacuum diode forward drop is quite small.
Eli D.
"The 5R4 is directly heated and turns on almost as fast as SS diodes. Also, the forward drop in 5R4s is large, a whopping 67 V. at a 250 mA. draw."
The 5R4 doesn't turn on nearly as fast as diodes. I use one in series in each of my 211 monos, and the 211s are heated well before HV appears. Second, the drop at 100mA is about 50V. It's not a "whopping" 50V when the supply is putting out more than 1KV. :)
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Buy Chinese. Bury freedom.
He uses a stack of 48v Cisco SMPS modules. I presume four more modules would not make too much difference raising from 816 volts to 1008.
ray
I could not find any specification for maximum DC voltage offset. Has anyone seen such a spec for this module? A kilovolt without suitable insulation would scare me away!
Paul, I don't understand the DC voltage offset question. Could you explain a little more.
ray
Secondary should be rated for voltage to ground and primary to secondary. ONE of these modules would have 1000V to ground, next would have 950V, etc.
Safety test for power supplies is typically 1500VAC (2100 peak) from AC line to output and AC line to ground, 500V from output to ground. This a SHORT TERM test (10 seconds or one minute) not a rating!
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