Posted by limono (A) on February 17, 2009 at 17:00:07

So, I have this nice hefty, enclosed surplus military 450-0-450 (only plate windings,490v unloaded, 109 Ohm full secondary)PT . It is rated 160mA RMS.Since it's military probably undrated. I'd like to use it in choke input supply with 120-140mA current draw in stereo 300B .Remind me again why should I look for 250-400mA unit??
REgards, L

• RE: Power transformer ratings - Tre' 08:16:03 02/23/09 (0)
  In Reply to: RE: Power transformer ratings posted by limono on February 17, 2009 at 17:00:07

  Have a look at this. It might be useful to you.
  
  Tre'
  Have Fun and Enjoy the Music
  "Still Working the Problem"
  

  • http://www.hammondmfg.com/pdf/5c007.pdf   (Open in New Window)

  
  

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• The Crest Factor - VoltSecond 19:05:42 02/17/09 (3)
  In Reply to: RE: Power transformer ratings posted by limono on February 17, 2009 at 17:00:07

  Usually the current rating is the RMS current. With a capacitive input supply the RMS current can be many times the output current. 3:1 is common.
  
  With a good choke input supply, the RMS current and DC output current are essentially the same.
  
  Play safe and play longer! Don't be an "OUCH!" casualty.
  Unplug it, discharge it and measure it (twice) before you touch it.

  . . .Oh!. . .Remember: Modifying things voids their warranty.
  
  

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  • RE: The Crest Factor - limono 19:12:44 02/17/09 (2)
    In Reply to: RE: The Crest Factor posted by VoltSecond on February 17, 2009 at 19:05:42

    Thanks
    I will need to put before a choke around 1uF to bring up voltage a little. So it won't be "pure choke" but close enough.
    regards, l
    
    

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    • Ultra Fast Diodes - VoltSecond 21:01:47 02/17/09 (1)
      In Reply to: RE: The Crest Factor posted by limono on February 17, 2009 at 19:12:44

      Make sure you use Ultra Fast Diodes if you aren't using a tube rectifier.
      
      Play safe and play longer! Don't be an "OUCH!" casualty.
      Unplug it, discharge it and measure it (twice) before you touch it.

      . . .Oh!. . .Remember: Modifying things voids their warranty.
      
      

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      • RE: Ultra Fast Diodes - limono 21:55:18 02/17/09 (0)
        In Reply to: RE: Ultra Fast Diodes posted by VoltSecond on February 17, 2009 at 21:01:47

        I'll use damper diodes.
        Thanks a bunch!, L
        
        

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