Amp/Preamp Asylum

• My first "zero gain preamp" - E-Stat 12:45:47 03/11/11 (4)
  In Reply to: RE: REVIEW: Horn Shoppe The Truth Preamplifier (SS) posted by clio09 on March 10, 2011 at 06:30:17

  cost me $15 assembled from Radio Shack parts. That is if you don't count the $18 knobs I used that were left over from an Audio Research preamp faceplate swap. For anyone interested, here's the recipe. I later built a better sounding unit using DACT attenuators, JPS Labs wire, Cardas connectors and put them in a nice Par-Metals aluminum box. That ran $300.
  
  Many folks really don't need any additional gain.
  
  rw
  

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  • There are differences between The Truth and a passive attenuator based control - 1973shovel 13:47:45 03/11/11 (3)
    In Reply to: RE: My first "zero gain preamp" posted by E-Stat on March 11, 2011 at 12:45:47

    The input and output impedance, and the resulting issues those impedances create, always kept me away from a passive volume control

    Here's information I've lifted from the Horn Shoppe site:

    "It has an input impedance too high to measure, output impedance is a couple ohms, bandwidth is to 60Mhz, slew rate is a couple hundred V/microsecond.

    There are no capacitors or resistors in the signal path. There is no potentiometer in the signal path.

    It uses photo cells to control the volume. It does not use optocouplers.

    It is an "active" device and suffers none of the "problems" that "passive volume control/pre amps" have. It can drive long (30 feet) cables with ease."
    
    

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    Edits: 03/11/11

    • If you need to drive long cables - E-Stat 14:50:51 03/11/11 (2)
      In Reply to: RE: There are differences between The Truth and a passive attenuator based control posted by 1973shovel on March 11, 2011 at 13:47:45

      then an active like that or the First Watt B-1 would be desirable. Since my cables are short and of low capacitance, I don't.
      
      rw
      

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      • I agree... - clio09 12:11:02 03/13/11 (1)
        In Reply to: RE: If you need to drive long cables posted by E-Stat on March 11, 2011 at 14:50:51

        I am going to be using The Truth with a 20 ft. run of interconnects. I use a Lightspeed attenuator with a short run. Both preamps are phenomenal. Very difficult to tell them apart sonically.
        

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        • It is all about - E-Stat 14:54:55 03/13/11 (0)
          In Reply to: RE: I agree... posted by clio09 on March 13, 2011 at 12:11:02

          system matching.
          
          rw
          

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