• RE: Altec 1570 B output transformer - Caucasian Blackplate 16:16:38 07/25/18 (7)
  In Reply to: RE: Altec 1570 B output transformer posted by Cleantimestream on July 24, 2018 at 11:50:48

  You could do much, much better than 16492 for a hifi amp. The low frequency power handling of the 16492 was never intended to be that stellar, and the 1570 specifications are quite clear about this. 40W at 30Hz is going to leave a lot to be desired if you need much more power than that. If you don't need that kind of power, there are other DHTs worth considering.
  
  
  

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  • RE: Altec 1570 B output transformer - autospecialty 18:32:13 07/28/18 (5)
    In Reply to: RE: Altec 1570 B output transformer posted by Caucasian Blackplate on July 25, 2018 at 16:16:38

    Mister Blackplate: What would you suggest in that case....150 watts, separate 4 ohm winding for feed-back,6.5k primary and insulation for 1000 volts....Help me out with this..........I need two of them ....Will
    

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    • RE: Altec 1570 B output transformer - Caucasian Blackplate 20:24:04 07/28/18 (4)
      In Reply to: RE: Altec 1570 B output transformer posted by autospecialty on July 28, 2018 at 18:32:13

      When you specify the "150 watts", you need to say at what frequency. A transformer that will do 150W at 20Hz is way, way larger than one that will do 150W at 100Hz.
      
      I would wonder about the necessity of the feedback winding. The speaker secondary on the 1570 floats (perhaps for bridging?), you could ground it and take your feedback from speaker +.
      
      Hammond, Slagle, Electra-Print, Heyboer, and Sowter could all likely wind this transformer for you. The core size might be a little bigger than what Mikey generally produces.
      

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      • RE: Altec 1570 B output transformer - autospecialty 23:26:10 07/28/18 (3)
        In Reply to: RE: Altec 1570 B output transformer posted by Caucasian Blackplate on July 28, 2018 at 20:24:04

        Sir: I need this transformer to go down at least 30 hz, I've contacted Hammond and they can't do it, I've tried to contact Electra-Print without success and Heyboer can't make it unless they have a sample transformer to reverse engineer.........Do you have any other idea's ??? THANKS
        

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        • RE: Altec 1570 B output transformer - Caucasian Blackplate 07:09:38 07/29/18 (2)
          In Reply to: RE: Altec 1570 B output transformer posted by autospecialty on July 28, 2018 at 23:26:10

          I would try submitting Sowter's custom transformer request. Be prepared to spend $1200+ for what you're looking for.
          
          Hammond could definitely make these, but I bet you'd have to buy a run. I guess Heyboer isn't a good choice since the transformer you want hasn't ever been made.
          

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          • RE: Altec 1570 B output transformer - autospecialty 08:08:46 07/29/18 (1)
            In Reply to: RE: Altec 1570 B output transformer posted by Caucasian Blackplate on July 29, 2018 at 07:09:38

            Sir: To spend 1200.00 for a transformer would be nuts and to spend 2400.00 for two of them would be nuts and crazy.....I have talked to Hammond and they told me they couldn't make them, Arline at Heyboer said he could build them if he had a sample......The feed-back winding seems to be a problem and insulation .......W
            

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            • RE: Altec 1570 B output transformer - Caucasian Blackplate 08:13:32 07/29/18 (0)
              In Reply to: RE: Altec 1570 B output transformer posted by autospecialty on July 29, 2018 at 08:08:46

              That's $1200 for the pair, not each. If you go down to 100W at 30Hz, the price will drop to $800. Sowter can handle your design requests, including the feedback winding.
              
              
              

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  • RE: Altec 1570 B output transformer - Cleantimestream 12:46:29 07/26/18 (0)
    In Reply to: RE: Altec 1570 B output transformer posted by Caucasian Blackplate on July 25, 2018 at 16:16:38

    I thought the same, however my friend is looking for a match to a spare pair {1570B}.
    The Mind has No Firewall~ U.S. Army War College.
    
    

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