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  1. UglyJoe

    Official HF-2 Serial Number List

    I can't find any documentation anywhere, but does anyone have any idea how many of these were actually made?
  2. UglyJoe

    Has anyone used the Relyon KT88?

    http://www.head-fi.org/forums/f5/kt8...be-amp-374543/ Doesn't sound good
  3. UglyJoe

    Brand-Name vs. Hand-Made

    Talk to MisterX or one of the other Mini^3 builders recommended by AMB and be done with it. Not a big fan of the CMOY. Great amp for a budding DIYer, not something I'd be interested in buying from someone else as a serious amplifier. My two cents.
  4. UglyJoe

    Calling all Doctors (No MDs though)

    Quote: Originally Posted by devin_mm 1) Was there anything special you did or recommend doing to just get in to graduate school (over and above marks)? Eg. volunteering, groups, undergraduate research 2) What's needed to go from a masters program into a doctoral program? 3) Was...
  5. UglyJoe

    How Balanced Is Balanced?

    Quote: Originally Posted by jcx Bill Whitlock of Jenson Transformers has been instrumental in audio standards organization’s definition of "Balanced" interfaces in audio the distinction is not the commonly understood symmetrical +/- drive Voltages but rather the equal impedance in...
  6. UglyJoe

    How Balanced Is Balanced?

    Quote: Originally Posted by jazznap Thanks UglyJoe. That helps immensely. It also sounds like there is no reason to upgrade to a balanced amp early and run it SE with the intent to upgrade the source later, since performance may suffer in the interim. Are there some high-end SS amps...
  7. UglyJoe

    DIY tube amp with passive throughput option?

    ??? Just use the comp output when you need it. Bypassing the "amplification" portion of the amp won't matter much as far as tube life. Quiescent dissipation is typically much higher than signal dissipation... just because the amp isn't being fed a signal doesn't mean that it's not working... hard!
  8. UglyJoe

    How Balanced Is Balanced?

    Yes and no. The biggest benefit to going balanced is in the performance of the amplifier itself, as far as headphones go. Balanced transmission was really developed for driving long cables such that any common mode noise picked up in the cable would be cancelled at the destination. Since...
  9. UglyJoe

    Today's music versus the real deals from 60/70"s

    Personally love Coheed and Cambria.... very retro-sound, but great musicians, long progressive songs (a favorite of mine), great music. Takes a few minutes to get used to Claudio's voice for some though...
  10. UglyJoe

    High-End Solid State Amps : Overview & Roundtable

    Find someone to build you a beta22 and be done with it.
  11. UglyJoe

    New Project: A SET Transformer-coupled 2A3 Headphone Amplifier

    Quote: Originally Posted by FrankCooter I still think you ought to drop the 2a3. Your 60ma per tube B+ requirement, plus any sort of regulation loss is going to require a very large, heavy, and expensive power supply that is totally unnecessary for this application. The 2.5a per tube...
  12. UglyJoe

    New Project: A SET Transformer-coupled 2A3 Headphone Amplifier

    The idea for a “new” SET transformer-coupled headphone amplifier has been rolling around in my head for a while now, and is the result of several factors. 1.)There seems to be a general lack of vetted and community-wide SET designs out there. That’s not to say that you can’t find them, but...
  13. UglyJoe

    Official HF-2 Serial Number List

    #230 checking in.
  14. UglyJoe

    HF-2

    I just got off the phone with Todd. He said shipping should resume tomorrow or Wednesday for the HF-2. He's expecting twice the normal-size shipment from Grado, which is why he charged cards last week. He said if they had waited to charge the cards that they wouldn't be able to charge all the...
  15. UglyJoe

    The argument to end all cable wars

    Demonstrating a phenomenon is scientific in nature.... i.e. - If you can't demonstrate something scientifically (with repeatable, measurable results), then you haven't demonstrated it at all.... This argument: "If I told you that people could fly like Superman, then would you let science...
  16. UglyJoe

    The Grado HF-2 Review/Comparison Thread

    On the issue of headphone burn-in: There is a measurable change in many driver characteristics after burn-in. For instance, Troels Gravesen measured a change in resonant frequency in the drivers he designed from 50 to 42 Hz over about 100 hours of break-in - this was an average change over...
  17. UglyJoe

    HF-2

    31st of May. I had called a couple of weeks ago and they told me mine were scheduled to ship today. My card hadn't been billed yet so I called to make sure there weren't any issues and that's when I was told about the delay.
  18. UglyJoe

    HF-2

    I talked to Todd this morning. Apparently there is a delay on the headphones that were to ship this week. Todd told me that Grado has exhausted their supply of headbands. The headphones are otherwise completely assembled and Todd said they are expecting to have the headbands next week. He said...
  19. UglyJoe

    Sennheiser HD650 repair - feel burned - What's your opinion?

    That makes a lot more sense. Unfortunate that you can't get the simple replacement part and fix it yourself, but that's how it goes sometimes.
  20. UglyJoe

    Sennheiser HD650 repair - feel burned - What's your opinion?

    Wait, so you got a price quote on a repair? Just get a price quote on the new part and have them ship that to you. Fix it yourself... Should be a lot cheaper, I'd think.
  21. UglyJoe

    Can I improve SQ by driving 1 headphone with 2 amps at the same time?

    Quote: Originally Posted by paaj Could be your scheme 1 with attenuators in the four branches. Yes, but most VAS have fairly large output impedances... loading them with a pot is usually not done, and as I said would require some interesting engineering.
  22. UglyJoe

    Can I improve SQ by driving 1 headphone with 2 amps at the same time?

    Quote: Originally Posted by jawang thank you very much for the info uglyjoe, that answered pretty much all of my questions is there a way I can test my presonus to find out which of those two configurations it uses? Look at the spec sheet? I'm not really sure. If I had to...
  23. UglyJoe

    Can I improve SQ by driving 1 headphone with 2 amps at the same time?

    The short answer is no, it won't do you any good, and might harm the headphones. There are a couple of ways that the output stage here could be configured. The first, and most logical, looks like this... As you can see, the outputs are paralleled, but driven by the same circuitry...
  24. UglyJoe

    HF-2

    Quote: Originally Posted by iggy-starnuts Doesn't the original price include $30 or $40 going to the forum? It seems wrong to charge for that when the seller would most likely have no intention of donating that to the forum! I can see people wanting to at least get their money back...
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