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Old 6th December 2006, 08:42 PM   #1
Bengali is offline Bengali  United States
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Default +B Power Supply Basics

Hi,

any suggestions for a good book on tube power supply designs or online sources?

there are so many designs. I'm trying to find out the basics, like after the rectification, where do you go from there, add a choke in series, add a cap, add a resistor,etc. How are the appropriate values calculated for the target voltage and to achieve the low noise, low ripple?

If I have a transformer with an output of 220V, after full wave, I have about 311V. My target voltage is 200v, less than 50mA.

If I wanted to use solid state parts to regulate it, what would you use?

thanks.
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Old 6th December 2006, 09:21 PM   #2
SY is offline SY  United States
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"Valve Amplifiers" 3rd edition, Morgan Jones. He treats these questions in great detail.
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Old 6th December 2006, 09:28 PM   #3
zobsky is online now zobsky  India
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Default Re: +B Power Supply Basics

Quote:
Originally posted by Bengali
Hi,

If I have a transformer with an output of 220V, after full wave, I have about 311V. My target voltage is 200v, less than 50mA.

If I wanted to use solid state parts to regulate it, what would you use?

thanks.
I'm guessing that 311 is the unloaded voltage, .. The load will affect the output voltage.

Also, reducing the first C in a CLC..... filter will bring down the voltage, and vice versa.

PSUD is a good software to play around with these values, in addition to reading up.

Hope that helps
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Old 6th December 2006, 09:32 PM   #4
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there a few important things to remember


1. V=IR
if the transformer is NOT loaded, then I is virtually 0 and there will be no voltage drop at all no matter how much R is in the Line. This becomes a real pain in the behind when you are trying to drop voltage without knowing the operating point of your tube.


2. Once again, if the Transformer is not Loaded, all of the voltages read marginally higher even with no resistance in the Line.

3. many people suggest that you usePSUD2 However in my experience it seems rather worthless unless you already have a circuit built, and you are tweaking it.

4. Have fun!

I'll be happy to answer any more questions to the best of my ability

-Moose
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Old 6th December 2006, 09:38 PM   #5
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Bengali,

A nice new design from John Broskie:

http://www.tubecad.com/2006/11/blog0087.htm

I did build 2 of these for 250DC volts and 50mA load for my phono stage

Working real great!!

These can be called "regulations..."

I did use a LF356N as IC and 7mA in the IXCP 10M45 {could use a DN2470}

Ripple invisible at the scope... and no variation of output voltage between
0 and 300mA... done tests until 1.2A

regards.

Alain.
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Old 6th December 2006, 09:42 PM   #6
Nordic is offline Nordic  South Africa
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Why do they call it B+?
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Old 6th December 2006, 09:42 PM   #7
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A couple of nice articles here including a few on beginning PS design: http://www.audioxpress.com/resource/...lass/index.htm
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Old 6th December 2006, 09:43 PM   #8
anatech is offline anatech  Canada
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Hi Nordic,
B battery, positive terminal.

-Chris
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Old 6th December 2006, 09:44 PM   #9
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Quote:
Originally posted by Nordic
Why do they call it B+?

correct me if I am wrong, but doesn't B refer to a battery that used to run the plates in old portable Radios? B+ being the positive Terminal
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Old 6th December 2006, 09:45 PM   #10
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Quote:
Originally posted by Alain Dupont
Bengali,

A nice new design from John Broskie:

http://www.tubecad.com/2006/11/blog0087.htm

I did build 2 of these for 250DC volts and 50mA load for my phono stage

Working real great!!

These can be called "regulations..."

I did use a LF356N as IC and 7mA in the IXCP 10M45 {could use a DN2470}

Ripple invisible at the scope... and no variation of output voltage between
0 and 300mA... done tests until 1.2A

regards.

Alain.

I like the Design, any chance I could sneak a peak at the schem?
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