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Old 23rd May 2010, 10:22 PM   #1
vasko is offline vasko  Czech Republic
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Default Transform computer supply into 400V supply for tubes

Is there project with complete schematics already done?

It also would be nice if it has pot for voltage adjust 50-400V if I'm not asking too much?

I want to drive guitar (pentodes and triodes) amp 50-100W with this.

Can you link me with such project?
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Old 23rd May 2010, 10:53 PM   #2
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You might be asking too much. You probably will have to rewind the transformer for higher voltage and, if you do, you might find its resonant frequency too low for proper operation for a switching supply. Computer power supplies only produce 5V and 12V.

Think about the volts/microsecond you will need to run such a beast.
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Old 23rd May 2010, 11:45 PM   #3
Pano is offline Pano  United States
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Just a tiny bit of searching would have found you this:
HV SMPS for tube preamp
It's a start.
(please do search)
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Old 24th May 2010, 01:05 AM   #4
star882 is offline star882  United States
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If you have an active PFC unit, the PFC section will supply roughly what you need. No isolation but it's cheaper to isolate the signal and isolation doesn't offer much safety at high voltages.
"Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!
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Old 25th May 2010, 09:53 AM   #5
vasko is offline vasko  Czech Republic
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I did a search but there is no schematic.

I want something like this,but there's no schematic included in this project.

Silicon Chip Online - Regulated High-Voltage Supply For Valve Amplifiers
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