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RE: Output Transformer for 3.1 Dac

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In Reply to: RE: Output Transformer for 3.1 Dac posted by Mark V, on March 05, 2013 at 13:30:06

It is connected unbalanced 18:1 ratio. Maybe Lundahl has even better transformers for this use, but for now I'm very happy with this one. I looked at the LL1660 before I bought these. Does anyone have any opinion on LL1660 for this use?

My friend reported very good results with Sowter line transformers in M3 line preamplifier (he replaced AN M4 I/E core). I'm not sure which one, I'll ask him and report here. He experimented with different resistors on the secondary of transformers (preamplifier output) so he can adjust the load output stage sees to make it sound best. Load on the secondary side of the transformer somehow reflects on the output stage. He also tried Hashimoto 33:1 transformers and wasn't satisfied.

I'm using TRANS-496 in my DAC and I'm happy for now. Sowter 9762 looks very interesting...

Follow Ups:

RE: Output Transformer for 3.1 Dac - Zvone 04:45:51 03/06/13 (2)
Sowter transformer from my last post is model 1160
- RE: Output Transformer for 3.1 Dac - bb1 04:39:20 03/08/13 (1)
  Hi Zvone,
  
  I've sent an email to you about this subject. Please check it out and reply.
  
  Thanks,
  Boris
  - RE: Output Transformer for 3.1 Dac - Tom R 21:23:00 03/09/13 (0)
    Several years ago I upgraded my DAC 1.2 output section. Used AN Preamp transformer model: 011/01A and a single tube per channel. This simplifies
    the output section to one transformer, one tube (6N1P), and the necessary cap and resistor to set the tubes biases point in a cathode follower arrangement. Big improvement over stock and upgraded original output board
    in the 1.2
    
    That is the entire output section per channel. For me, this was a more economical than rolling designer caps and endless list of tube.
    
    Tom R

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