Posted by Ejam (A) on January 13, 2009 at 16:22:08

Kevin

Regarding building an amplifier (without an old Stereo 70 to modify), is the Lundahl LL1663 a better option than a replica Dynaco 470 output transformer?

Regards

Anthony

• RE: Stereo 70 Kit Output Transformer Options - KevinC 06:15:49 01/14/09 (1)
  In Reply to: RE: Stereo 70 Kit Output Transformer Options posted by Ejam on January 13, 2009 at 16:22:08

  From a sonic standpoint I can't say which is preferable, because I haven't tried an LL1663/PP or an LL1682/PP on mine. I would opt for the latter, because I have 4 ohm speakers.
  
  It is fair to say that the A470 is a very good output transformer.
  
  
  Kevin Carter
  K&K Audio
  www.kandkaudio.com
  
  

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  • RE: Stereo 70 Kit Output Transformer Options - Ejam 14:36:15 01/14/09 (0)
    In Reply to: RE: Stereo 70 Kit Output Transformer Options posted by KevinC on January 14, 2009 at 06:15:49

    Kevin and Ironmonger
    
    Thanks for the replies, appreciated. The other transformer I was looking at was the Peerless S-240-A built by Magnequest. Although more expensive than the Lundahl or Dynaco it does have its sonic admirers.
    
    Regards
    
    Anthony
    
    

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• RE: Stereo 70 Kit Output Transformer Options - Ironmonger 20:50:40 01/13/09 (0)
  In Reply to: RE: Stereo 70 Kit Output Transformer Options posted by Ejam on January 13, 2009 at 16:22:08

  Hi Anthony,
  I've just built a K&K ST-70 using a new SS Chassis and Power transformer and used a pair of LL1663's.
  It's easy to mount the 1663's, you just need to drill 4 new holes on each side of the chassis.
  I have mine wired up in Ultra-Linear and am using new GL KT77's.
  
  Sound is great with the LL1663's! Good top and bottom extension and clean and detailed sounding.
  Unfortunately I can't comment on the Dynaco A470's as I don't have a pair to compare :(
  You could also look at the LL1663AM outputs!
  
  Good luck with your build, Russell
  
  

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