Tweakers' Asylum

"Like 0.6amp to 3amps. It works."

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1973shovel

In Reply to: RE: Power Supply upgrade for Chord DAC posted by bobwire on March 31, 2024 at 11:44:38

View YouTube Video

Yes, and here's why. In a Stereophile interview, McGowan, recounting the same story, says it's because of the much lower secondary impedance of the electrically 'oversized' power transformer.

https://youtu.be/zaq-eU8ru-o?si=i2D4mEKwbTfTUSN_ (Open in New Window)

Follow Ups:

RE: "Like 0.6amp to 3amps. It works." - Tre' 15:51:25 04/04/24 (4)
But he didn't say why. Near the end of the video he said that they had learned over the years some of the parameters of what causes that and why but he didn't explain.

Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
- He 'sort of' does - 1973shovel 04:46:56 04/05/24 (3)
  At about 5:30 he mentions 'Sergio at Mercury Magnetics' who felt it was the "lower DCR of the output impedance..."
  
  In the link below, I posted his quote back in 2012, which said that the cause was this:
  
  "We built 'em for years, actually, before we finally figured out what was happening. Which was the large transformer's very low secondary impedance, maybe under an ohm, whereas it's of the order of 35-50 ohms for a small transformer with the same voltage."
  
  And in that old, linked to post, there's also a link to the original Stereophile interview where McGowan made the claim.
  - very low secondary impedance (Open in New Window)
  - Thanks. nt - Tre' 16:57:10 04/19/24 (0)
    .
    Have Fun and Enjoy the Music
    "Still Working the Problem"
  - RE: He 'sort of' does - Mike B. 08:17:20 04/05/24 (1)
    I talked on the phone with Stan a number of years back. He lived here in Eugene, Oregon then. One of the things that stuck with me was his statement that the power supply is in the signal path.
    - "I talked on the phone with Stan a number of years back" - 1973shovel 03:30:48 04/06/24 (0)
      I did too, sometime around 1992. He was modding the JVC 1050 (XL-Z1050TN) CD player at the time, and he informed me of a shop where I could buy one, by mentioning his name, for $500 new in box. The place turned out to be local to me at the time, so I bought one. By the time I saved up enough to have mine modded, Stan had faded into obscurity, sadly.
      
      I remember two things about our conversation, in addition to him getting me a great price on the JVC. First was that he was very easy to talk 'audio' with. The second, which I've had questioned by a few on the Asylum over the years, was in regard to leaving a CD player powered on all the time, which Stan Warren suggested to me for 'best sound'.
      
      I asked if the laser wouldn't wear out sooner by leaving it on 24/7, but Stan assured me that as long as I removed the CD from the drawer after listening, the laser would shut itself off, and then reactivate whenever another disc was inserted.

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