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• Thanks everyone for the suggestions... - kellymon 07:37:12 06/19/12 (0)
  In Reply to: RE: How to adapt SET for headphone use? posted by kellymon on June 17, 2012 at 08:48:17

  You all gave me enough info to be able to figure out what option I want to try. I'll start with the resistor Chris suggested since I already have them, and study up on the other ideas. Hopefully the amp will be quiet enogh to proceed furthur.
  thanks!
  Robert
  

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• Easy to do... - Triode_Kingdom 05:50:59 06/18/12 (0)
  In Reply to: RE: How to adapt SET for headphone use? posted by kellymon on June 17, 2012 at 08:48:17

  Search for the word "headphones" authored by me. Here's one post that's relevant...
  
  
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  Buy Chinese. Bury freedom.
  

  • Headphone Thread   (Open in New Window)

  
  

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• Well, not that simple - Jon L 23:33:53 06/17/12 (0)
  In Reply to: RE: How to adapt SET for headphone use? posted by kellymon on June 17, 2012 at 08:48:17

  Depending on the amp's noise floor and sensitivity and impedance of the 'phones, the optimal values of R and configuration will differ.
  
  A transformer to match the specific 'phones exactly is the optimal way, but others have used variable transformers like ASL used to make.
  http://www.monoandstereo.com/2008/03/antique-sound-lab-uhc-signature.html
  
  More info at link, about 40% down the page.

  • Power amp for headphones   (Open in New Window)

  
  

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• Hum - Frihed89 23:32:13 06/17/12 (0)
  In Reply to: RE: How to adapt SET for headphone use? posted by kellymon on June 17, 2012 at 08:48:17

  This can be a problem when converting a speaker driving 2A3 or 45 into a headphone driving amp. Mfrs of headphone amps using these amps take special care when designing their filament power supplies.
  Observe, don't think
  
  

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• RE: How to adapt SET for headphone use? - Chris O 09:29:16 06/17/12 (2)
  In Reply to: RE: How to adapt SET for headphone use? posted by kellymon on June 17, 2012 at 08:48:17

  The traditional way is to put an 8 ohm resistor across the speaker outputs and wire up a phone jack for your headphones from the speaker outputs.
  
  
  
  

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  • 8 0hm resistor - kellymon 10:11:01 06/17/12 (1)
    In Reply to: RE: How to adapt SET for headphone use? posted by Chris O on June 17, 2012 at 09:29:16

    Chris,
    So the 8 ohm resistor loads the xfmr and since it is so low it dominates?
    Sounds easy enough....is the fidelity acceptable? I was half expecting to need a different output xfmr....this sounds too easy ;)
    thanks,
    Robert
    

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    • RE: 8 0hm resistor - Chris O 12:48:40 06/17/12 (0)
      In Reply to: RE: 8 0hm resistor posted by kellymon on June 17, 2012 at 10:11:01

      You can actually use a higher value resistor than 8 ohms (20 or 30 ohms can work) and the fidelity will be still good. You want to make sure the amp never sees an open circuit. Yes, this is pretty easy.
      
      
      
      

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