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Old 25th September 2008, 02:34 PM   #1
tomat is offline tomat  Indonesia
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Join Date: Dec 2007
Location: east java
Default looking for hv power supply kit for car tube preamp

anyone can give the information?where i can get HV pwr supply kit for convert 12vdc to 250-260vac about 50-60ma for powering up car tube preamp? i have a plan to build car tube preamp but i don't understand how to convert from 12vdc to higher voltage AC

thanks a lot
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Old 27th September 2008, 12:42 AM   #2
tomat is offline tomat  Indonesia
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Join Date: Dec 2007
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any suggest?,i'm also trying to contact the person in audiohobbyist.com ,but i can't reach him.anybody know where to buy kit like that?

thanks a lot for the help
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Old 27th September 2008, 03:09 PM   #3
Minion is offline Minion  Canada
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Join Date: May 2006
Location: Cowican Bay , vancouver island
I"m no expert but I think Converting 12v DC into 240v AC is going to be a bit of a challenge to do in a DIY Fashion....getting AC from DC is also another challange....

You can buy a power inverter that will convert your 12v DC to 120V AC (The one in My Car puts out 150w AC at 120v AC Max), Most auto Shops have them....If you do this then you won"t have much of a problem because you can simply build your preamp as if you were going to power it from your wall plug but plug it into the Inverter instead.....

You can also get a SMPS which will convert your 12v DC into 120-240v DC , I know the output is DC but I believe that Tubes prefer well filtered DC over AC anyways.....


Good Luck
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Old 2nd October 2008, 01:25 AM   #4
tomat is offline tomat  Indonesia
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Join Date: Dec 2007
Location: east java
Quote:
Originally posted by Minion
I"m no expert but I think Converting 12v DC into 240v AC is going to be a bit of a challenge to do in a DIY Fashion....getting AC from DC is also another challange....

You can buy a power inverter that will convert your 12v DC to 120V AC (The one in My Car puts out 150w AC at 120v AC Max), Most auto Shops have them....If you do this then you won"t have much of a problem because you can simply build your preamp as if you were going to power it from your wall plug but plug it into the Inverter instead.....

You can also get a SMPS which will convert your 12v DC into 120-240v DC , I know the output is DC but I believe that Tubes prefer well filtered DC over AC anyways.....


Good Luck


thanks a lot for the input Mr Minion
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Old 6th December 2008, 06:38 AM   #5
whstark is offline whstark  United States
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Join Date: Dec 2008
Hello ,
Been working on a 250v supply for a 1937 car radio,
they want it converted to 12v and the old 6v transformar was gone anyway. Had an Idea, at work I was using my ac isolated supply with a voltage doubler 2 - 80 mf 450 v caps and 2 diodes,
to make 250 volts for the plate voltage when the vibrator supply didn't work, to run the radio, worked great. Now I thought what about using a 120v ac car inverter, grabed one from stock put 12v on it and wala add the doubler and you get a 12v 250v supply, guess if the ac side is isolated from car chassis you could parallel the outputs to get any voltage. Worked great and you get AC in the car to. Well it did work but thought Id build a suppy anyway, Used 2 MTP3055 MOSFETS, and a dual 120v winding to 24v Centertapped 4 amp, put the 24 v side on the Mosfets and drove them with a SG3525 IC which is made for just that. And put both 120 volt output windings in series with a fullwave bridge and a filter cap. So about 30 dollars including 10 dollar transformar, filter caps, etc.
Easy to find Circuits using SG3525, you can even regulate output with it with a votage divider on output fed back to IC. Thats all for now.
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Old 7th December 2008, 02:27 AM   #6
KBK is offline KBK  Canada
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Yes, a beefed up cheapie lighter plug in car 120AC converter would be good for 350VDC, and then smoothed out to 300DC or so under load and regulation.

These are quite inexpensive.
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Old 7th December 2008, 02:48 AM   #7
tomat is offline tomat  Indonesia
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thanks all for the help
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