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  1. zilch0md

    iFi Audio Micro iTube2 Buffer

    Tube life extender: https://www.amazon.com/dp/B00MVDTEXS This countdown timer is mechanical (spring-driven), introducing no electrical noise that I can detect (unlike a digital countdiwn timer I tried.) Warning: After you install this, you will always remember to power it off manually...
  2. zilch0md

    iFi Audio Micro iTube2 Buffer

    I very much like the weaker of the two 3D+ settings, with my near-field monitor setup, but the stronger setting sounds to me as if some unappealing reverb was added. A majority consensus should rule, here, so again, I would encourage you to survey your customer base. I appreciate your...
  3. zilch0md

    Topaz Low-Capacitance Isolation Transformers - for Affordably Clean Power

    Thanks Chris, As evidenced by many great posts, there are several contributors here who have a much better understanding than I do on how to make the most of these low-capacitance ITs. The good news for the common audiophile is that you can accomplish a lot, just by inserting an appropriately...
  4. zilch0md

    Topaz Low-Capacitance Isolation Transformers - for Affordably Clean Power

    Yes, there are at least three schools of thoughts, here: 1) Use nothing but grounded-neutral secondary ITs (ideally, just one big one with all component power cords plugged into outlets that are as close together as possible, sourced from that one ITs secondary). 2) Use nothing but...
  5. zilch0md

    Topaz Low-Capacitance Isolation Transformers - for Affordably Clean Power

    See: https://www.head-fi.org/threads/topaz-low-capacitance-isolation-transformers-for-affordably-clean-power.857448/page-17#post-14834948
  6. zilch0md

    Topaz Low-Capacitance Isolation Transformers - for Affordably Clean Power

    It's importamt that you understand the context for which the narrator of that video is concerned. He works at a test bench, often with energized circuits in an exposed chasis where there is a high probability of unintentenionaly electrocuting himself by simultaneouesly touching both hot and...
  7. zilch0md

    Topaz Low-Capacitance Isolation Transformers - for Affordably Clean Power

    That's good advice. Really, you could bring the fuse rating down to nominatlly exceed your peak current demands - even if that's well below the transformer's rating.
  8. zilch0md

    Topaz Low-Capacitance Isolation Transformers - for Affordably Clean Power

    This is what I used when I "restored" the Topaz seen in the first post of this thread: Fuse Holder: https://www.amazon.com/gp/product/B00EUF6JDS 20A 250V Fuses: https://www.amazon.com/Divine-Lighting-Slow-Blow-Ceramic-MDA20A/dp/B004I36FJA Or if you prefer: 15A 250V Fuses...
  9. zilch0md

    Topaz Low-Capacitance Isolation Transformers - for Affordably Clean Power

    I really don't want to start reporting measurements for anything else, especially since field strength varies greatly with brand, not to mention proximity, but several appliances/devices in our home are far "hotter" at 18 inches than the Topaz transformer and APC regulator (I.e. Cordless...
  10. zilch0md

    Topaz Low-Capacitance Isolation Transformers - for Affordably Clean Power

    Here are some EMF measurements, but the opinions as to what levels create a health hazard are as varied as our tastes in music, so I will leave that to each reader to research on his own. I will offer my opinion that this 500vA Topaz and the APC voltage regulator are "safe" even at 18 inches...
  11. zilch0md

    The Deals DISCUSSION Thread (READ THE FIRST POST!!!)

    The Sony SACS9 subwoofer is back down to only $98 again. https://www.amazon.com/Sony-SACS9-10-Inch-Active-Subwoofer/dp/B00O8YLIY6
  12. zilch0md

    OPPO PM-2 Is Available - Post Your Impressions Here

    ^^ Not to mention... The source, DAC, amp and cables you are using, your ears, your personal taste, etc. But, I dare say, the PM-1/PM-2 are among the most consistent of headphones when moving them from one system to another - they are the antithesis of something like the HD800, which is...
  13. zilch0md

    Oppo HA-1 Impressions Thread

    You would have to listen to know for sure, but I don't recommend using a UPS.
  14. zilch0md

    The Deals DISCUSSION Thread (READ THE FIRST POST!!!)

    10-inch 115W powered Sub by Sony $98 instead of $200 https://www.amazon.com/gp/product/B00O8YLIY6
  15. zilch0md

    The Deals DISCUSSION Thread (READ THE FIRST POST!!!)

    400GB is back up to $112.95, now, but as of this morning... SanDisk Ultra 128GB microSDXC UHS-I Card with Adapter, Black, Standard Packaging (SDSQUNC-128G-GN6MA) $30.49 An all-time low at Amazon, per CamelCamelCamel.com. Buying three of these gets you more GB/$ than the 400GB, even if it...
  16. zilch0md

    Any old fart head-fi'ers still around?

    Hey Skylab, Your series of portable amp reviews was the driving force behind my getting carried away with headphones, when I joined in 2007. I really appreciate all the hard work you put into those reviews, especially since I always found them to be trustworthy, including your review of the...
  17. zilch0md

    The Opamp thread

    Responding to some questions asked above... I've only tried the 2x Mouser Muses02 in the input stage of an iBasso PB2 amp. I have no doubts about how they sound to my ears with my gear. They suck! :-) They are anything but accurate in terms of frequency response and poorly resolving of fine...
  18. zilch0md

    Topaz Low-Capacitance Isolation Transformers - for Affordably Clean Power

    ^ No, it's not grounded at the receptacle, but under the coils somewhere. At the receptacle, I've proven with my multimeter that Neutral and Ground are connected.
  19. zilch0md

    Topaz Low-Capacitance Isolation Transformers - for Affordably Clean Power

    I'm really surprised to hear this. I thought all of the Topaz and alternate brands of these transformers were manufactured with grounded-neutral secondaries. Maybe some of them have been modified over the years by previous owners, but it's possible some were actually manufactured that way...
  20. zilch0md

    Topaz Low-Capacitance Isolation Transformers - for Affordably Clean Power

    Hey oneguy! That's literally what defines these Topaz isolation transformers as having "grounded-neutral secondaries" as opposed to transformers like the B&K Precision, that have "floating-neutral secondaries. Both types provide common-mode noise rejection, with attenuation in the higher...
  21. zilch0md

    Oppo HA-1 Impressions Thread

    Wow, that was quick - thanks, both of you! So, the common thread here is that neither of you are using the HA-1's USB receiver. I found that using even an inexpensive USB-to-SPDIF converter with Coaxial out to feed the HA-1's DAC section was superior to using the HA-1's USB receiver - at...
  22. zilch0md

    Oppo Sonica DAC (an affordable ES9038PRO Sabre DAC)

    I don't have the HD 800S, but I do have the HD 800, as well as the HA-1 and the Sonica DAC. It really depends on which input you are using, as the HD 800 sounds a lot better with the HA-1 when not using the HA-1's internal USB interface. Optical or Coaxial inputs sound smoother - a little...
  23. zilch0md

    Oppo HA-1 Impressions Thread

    Regarding the benefits of balanced output: https://www.head-fi.org/threads/ignorance-cure-needed-balanced-vs-unbalanced.260346/#post_11558111
  24. zilch0md

    Topaz Low-Capacitance Isolation Transformers - for Affordably Clean Power

    Hey Alex! Thanks very much for the clarification! I couldn't remember the details of John's advice regarding DC filters (nor even how to spell his first name!) LOL Like watching a movie you haven't seen in years, everything you've written came back to me as I read it. Sheesh! And for...
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