• Re: RAKK question... - Dave Davenport 08:26:25 06/09/04 (2)
  In Reply to: RAKK question... posted by keto on June 09, 2004 at 06:13:08:

  Hi Keto,
  You have several options. First I'll talk about standard offerings and then about DIY.

  For the standard offerings, into 15K Ohms the transformer output stage, which has about 2800 Ohm output impedance, would not be a good choice. Your choice here is the tube output stage, which has 250-Ohm output impedance. Into a 50K input impedance, either should be okay.

  For the DIY, you have a lot of gain in your preamp. The output directly from the RAKK DAC into 47 Ohm resistors should give you about 0.26V RMS at full signal so this level is compatible with your preamp. Now the RAKK DAC output is differential so you will need to provide a differential to single ended conversion as well as ground isolation. A pair of LL1676 transformers (one for each channel) wired 1:1 would be an elegant solution here.

  Dave

  
  
  

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  • Re: RAKK question... - keto 15:06:52 06/09/04 (1)
    In Reply to: Re: RAKK question... posted by Dave Davenport on June 09, 2004 at 08:26:25:

    Thanks, Dave. I'll look forward to the upcoming presentations, since there's very little I understand about DACs.

    One thing I do see though, is that my SE-PP amps (see "inmate photos") might be reconfigured as PP-PP, with a stereo pot and a toggle for optional balanced input.

    So far, I've consistently prefered a SE first stage, but then I'm always experimenting. DAC - 47R pair - dual 50K - 6C45 pair - (direct-coupled) 2A3 pair seems very promising.

    Would I need a coupling cap, to deal with any DC output from the DAC?

    Thanks. --keto
    
    

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    • Re: RAKK question... - Dave Davenprt 18:29:16 06/09/04 (0)
      In Reply to: Re: RAKK question... posted by keto on June 09, 2004 at 15:06:52:

      Hi Keto,

      You wrote: Would I need a coupling cap, to deal with any DC output from the DAC?

      Nope, the DC gets blocked by the transformer.

      Dave
      
      

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