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In Reply to: RE: Substitute a Switching Wall Wart with a Linear Wall Wart? posted by tvr2500m on November 14, 2019 at 10:09:43
Sure. A regulated linear power supply would do wonders for the Musical Fidelity V-90 BHA headphone amplifier. I recommend determining a budget-level, then go forward from there, vr2500m.This Studer900 PSU is excellent, especially for the price. Research the Studer900 in the AA archives. The low-cost plus free shipping charge leaves enough room for an audiophile-quality power cord and higher-performance DC umbilical to mate it with.
See link:
Edits: 11/15/19Follow Ups:
I've been looking at those on AliExpress; I would like to try one on my Trends TA10.1 Tripath chip amp; I do not know however what the current rating should be. The actual switching PSU puts out max 3,5A.
Edits: 04/17/20 04/17/20
Looks like Alan just bought one...
Quick question. There are A LOT of these PSUs listed. Any reason to buy one over another? Ones to avoid? Things to look out for?
Apparently Duster has compared some of these and says it's the best he has heard in the low cost arena. Here is a discussion of the product. Looks super easy to upgrade what are already somewhat likely to be pretty good diodes according to some along with the main cap. This with or without the diodes and ps cap upgrade it would likely be a gigantic improvement over what you have,IMO.
"The party told you to reject the evidence of your eyes and ears. It was their final, most essential command." George Orwell-1984
Okay, then. This one it is for the stake in the ground.
I've also tried the smaller Studer900 PSU with an encapsulated toroidal transformer and multiple smaller value filter caps, and it also sounds high-performance, but the larger version with a non-encapsulated toroidal transformer is a more impressive build and costs about the same. It also seems to be more rare in the marketplace, so get one while they are still available. The Nover filter cap is very good, and the same make as Gustard uses for their excellent DACs, so it does not need to be upgraded.
After the initial comparison, presuming it's successful (versus the 'stock' switching PSU I've been using for years), I may deep-cryo treat the Studer and do a further comparison. Having treated a large variety of cables, tubes, AC parts, and other miscellania since 1997, I wouldn't be surprised with a good-to-excellent result.CD players, DACs, amplifiers, transformers, various populated circuit boards (such as in my SONY SCD-1 years ago),and even DVD players have been treated, with the owners dancing afterwards. 'Ya never know....
Edits: 11/18/19
You can decide to only cryo the substantial solid core copper wire toroidal transformer within the enclosure, by easily removing the circuit board first.
....but not the circuitry, IEC connector, and 2-pin power connector?
Edits: 11/22/19 11/22/19
The toroidal transformer, the IEC inlet, and the 2-pin DC jack are affixed to the enclosure. The circuit board is simply secured to the inside of the enclosure with four screws, while the I/O wiring of the circuit board features set-screw terminals for the purpose. The circuit board could be easily removed, then the entire enclosure be placed into the cryo tank, with the more sensitive electronics being kept out of the process, if so desired.
Thank you for the detailed pic and description....however, everything populating the circuit board will benefit from the cryogenic treatment, including the traces and contact points.
On the linear PS board there are electrolytic caps, resistors, transistors, what looks like a timing chip, a mosfet with heatsink, and a 10K pot. Nothing unusual. Some or most of these part types (in various guises and values) have been used on the Cable Cooker models over the past 20 years. I began cryogenic treatment in early 2009, wishing I would have done it sooner. It was a major sonic improvement.
Thanks again for the suggestion.
Thanks for clarifying your findings about cryo'd electronic parts rather than only cables and connectors, Alan. I was not aware that the electrolyte fluid of a capacitor could not be detrimentally affected by the extreme temperature of cryo treatment, nor perhaps a contraction of the dissimilar materials of a miniature chip and other electronic parts. One more matter to put into my mental database...
....populated circuit boards have been cryo-treated for decades, especially in the aerospace industry, and somewhat in the auto/racing industry. I first learned of this perhaps in 1997, when I first started doing business with Cryogenics International. At that time they had been treating populated circuit boards for years (within various component modules).
My own experience....I've never had one issue post-cryo with a Cable Cooker board.
Thanks for that....just ordered that very model. I've always wanted to try a linear supply for the Cable Cooker and see if there is any qualitative difference in the results.
I'll likely do a couple of blind comparisons (with colleagues) and find out.
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