• Re: David Hafler is still alive and ... - CharleyW 09:09:52 05/09/03 (2)
  In Reply to: Re: David Hafler is still alive and ... posted by carl f on May 08, 2003 at 16:37:44:

  The tranformer is the only significant thing I did (of course, with the obsession common to all of us, I should add SO FAR). I may have also jacked up the bias a little bit.

  Not to continue assaulting your memory, but I believe Erno Borbely generally gets credit for designing the DH-200. The only changes in the 220 were mechanical (the input jacks were changed to side-by-side; the 200 had the left on the extreme left and right on the extreme right), some parts upgrades (carbon film resistors to metal film in some spots, better caps in some places) and a slight difference in the input circuit. This resulted in a new circuit board (the 220 and the 500 both used the same board).

  There was a 2 part interview with David Hafler in Vacuum Tube Valley about two years ago focused entirely on his career through the Dynaco years.
  
  

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  • Re: David Hafler is still alive and ... - guycom 12:09:24 05/09/03 (1)
    In Reply to: Re: David Hafler is still alive and ... posted by CharleyW on May 09, 2003 at 09:09:52:

    I once had a DH-200 and liked its very warm sound, would anyone know if the DH-500 has a very warm sound and if it was rated for use at 2 ohms? (I am driving infinity kappa 9's with a stock foreplay using RCA cleartops. Thanx for any help.
    Guycom
    
    

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    • DH-500 - CharleyW 13:03:19 05/09/03 (0)
      In Reply to: Re: David Hafler is still alive and ... posted by guycom on May 09, 2003 at 12:09:24:

      http://www.hafler.com/techsupport/pdf/DH-500_amp_man.pdf is the URL for the DH-500 manual.

      I disticntly remember Hafler quoting a 4 ohm spec; the PDF'd manuals are later (they have a Rockford imprint) and don't mention anything but 8 ohm. I would not be suprised that they could drive a 2-ohm load, though; I always had the impression those amps could drive a crowbar.

      
      
      

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• Glad you got it rolling - Sturgus 18:17:37 05/08/03 (0)
  In Reply to: Re: David Hafler is still alive and ... posted by carl f on May 08, 2003 at 16:37:44:

  I find it simply amazing what the Foreply does for what it cost. You may want to try the (shunt-mode) on the pots. Also if you are looking for mods for your Hafler try Musical Concepts.
  Sturgus
  

  • http://musicalconcepts.com/

  
  

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