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• RE: Can a standard Hammond choke be used for choke input? - Pete Millett 08:32:27 03/30/08 (0)
  In Reply to: RE: Can a standard Hammond choke be used for choke input? posted by bequerel on March 30, 2008 at 07:46:11

  Hammonds can be used but you have to de-rate them by 50% or so. If you have very high B+ you might also run into insulation issues.
  
  A better bet is the One-Electron PRC-2 (you can buy them at www.tubesandmore.com). I'm using them as input chokes and they're excellent - dead quiet.
  
  Pete
  
  

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• RE: Can a standard Hammond choke be used for choke input? - sorenj07 08:29:29 03/30/08 (5)
  In Reply to: RE: Can a standard Hammond choke be used for choke input? posted by bequerel on March 30, 2008 at 07:46:11

  I have found Hammond transformers to work, but unless you derate by a bit, you risk having them make mechanical noise. For 100mA I'd try a 10H 200mA choke (the 193J) but you're probably safest using the 193M (300mA). It's what I generally use on my projects.
  
  

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  • So if I'd like to draw a little more than 200mA - limono 16:20:18 03/30/08 (3)
    In Reply to: RE: Can a standard Hammond choke be used for choke input? posted by sorenj07 on March 30, 2008 at 08:29:29

    I need 500mA 21 Lbs. monster ???
    Regards, L
    
    

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    • RE: So if I'd like to draw a little more than 200mA - Eli Duttman 17:20:44 03/30/08 (2)
      In Reply to: RE: So if I'd like to draw a little more than 200mA posted by limono on March 30, 2008 at 16:20:18

      FWIW, I would not try to draw more than 170 mA. thru a Hammond 193Q serving as the 1st inductor in a pure choke I/P filter. That 1st inductor takes a ROYAL beating. OTOH, if a pseudo choke I/P filter, with its "fudge factor" cap. is employed, you can safely draw a bit more current. The small capacitance at the filter's I/P definitely eases some of the stress the 1st inductor is subjected to.
      
      Eli D.
      
      

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      • Thanks Eli -seems like Heyboer custom unit is - limono 18:29:13 03/30/08 (0)
        In Reply to: RE: So if I'd like to draw a little more than 200mA posted by Eli Duttman on March 30, 2008 at 17:20:44

        in order.I heard of some special epoxy versions of Hammond chokes with long waiting time . I need 220mA pure input choke filter for stereo 300 (bxl) amp
        Regards, L
        
        

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      • Yes - Caucasian Blackplate 17:30:17 03/30/08 (0)
        In Reply to: RE: So if I'd like to draw a little more than 200mA posted by Eli Duttman on March 30, 2008 at 17:20:44

        I can speak to this. I think I did +/- 1uf at the input of some power amps I built, then some 5hy @ 500ma Hammond chokes following. Pulling 300ma+ through at idle, the chokes run cool and quiet.
        -Paul
        
        

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        Edits: 03/30/08
  • Thanks a lot boys :-) - bequerel 08:35:23 03/30/08 (0)
    In Reply to: RE: Can a standard Hammond choke be used for choke input? posted by sorenj07 on March 30, 2008 at 08:29:29

    .
    
    

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