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Old 14th March 2008, 03:06 PM   #1
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Question Solid State Regulator for tube amp

Hi Folks,

Let me introduce. I'm from Brazil and i'm here in USA working as Electronic Engineer as i've graduated in Brazil.
I had a small company in Brazil which we use to manufacture old push pull amplifiers AB class for cars. In Brazil they call this amplifiers boosters. For so many reason in the economy i've decided to quit the company and move to USA.
I've never had built a tube amplifier, but i've decided to buy a DYNACO ST-35 to start. As a lover audiophile the sound was amazing. I really liked, but i have some problems and i would like to fix it.
First the power supply is keeping the voltage higher than it could be because i use another kind of transformer wich deliver 394 volts for the EL-84 where it should have maximum 300V right?
So i would like to build a High voltage solid state regulator for that using some mosfet. Is anybody have some idea. I know that it's hard to find some circuit to start because nobody seems to want a solid state to regulate high voltage.

Thanks guys,

Luiz Nickel
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Old 14th March 2008, 05:42 PM   #2
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Hello Luiz and welcome to the forums. You might wish to post this in another of the forums. This is only the introduction area and not everyone will look here.
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Old 14th March 2008, 05:55 PM   #3
PH104 is offline PH104  United States
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check out dynaco-doctor.com. There's a schematic on:

http://www.dynaco-doctor.com/paregsch.gif

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Old 14th March 2008, 06:39 PM   #4
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Thumbs up Voltage Regulator

Ok Phil,

Thanks for that... I'm going to take a look..
How can i post in another forum ?

Luiz
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Old 14th March 2008, 08:30 PM   #5
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Hi Phil,

I was trying to undestand the SCH, but who is the IC1 and other parts ? How much current this circuit can provide ?
Don't you have the part list for all ?

Thanks,

Luiz
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Old 14th March 2008, 09:21 PM   #6
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Here's a tip: try out that Search button you may have missed. This is a topic discussed frequently in the Tubes forum.

If you need a complete schematic you can follow this:

http://www.national.com/an/LB/LB-47.pdf
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Old 15th March 2008, 03:22 AM   #7
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Thumbs up Voltage regulator

Hi guys,

Thanks,

Actually now that i'm home i had more time to research and i found the discussion topic and i've got some circuits to start.
I'm going to post some pictures of my baby for everybody...
And when i got more questions i'll be i touch.

Luiz
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Old 15th March 2008, 03:32 AM   #8
SY is offline SY  United States
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I'll move this over to Tubes where it can get more play.

And I'd read the classic:

www.national.com/ms/LB/LB-47.pdf
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Old 15th March 2008, 03:45 AM   #9
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Luiz,

Seja bem-vindo aos Estados Unidos. (Welcome to the US)
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Old 15th March 2008, 05:02 AM   #10
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One MOSFET, for example IRF740, couple of SG-4S gas discharge tubes in series, 10KOhm / 5W resistor, and one 12V Zener to protect gate. Nothing more is needed. Except may be one 22 Ohm / 5W resistor to protect MOSFET against sudden surge current.
I.e. parametric stabilizer + source follower.

More than adequate regulation for your particular case, also nice purple glow.
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