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  1. Pars

    KG CFA3 headphone amp

    The output stage of the CFA3 doesn't really look stripped down from the CFA2 to me, but I haven't compared them closely. On the CFA3 that I worked on, I couldn't tell much if any difference between the SS vs. ZF modes either.
  2. Pars

    Nakamichi TA-2A speaker amp common ground??? Please help with wiring.

    Do you have a multimeter with ohms functionality? If so, check continuity between the - speaker terminals. If 0 ohms (or <1 ohm), you should be good. If not, then the - terminals are not common and the 4 pin XLR would be prudent. I'd also ask this question somewhere like diyaudio, in the Pass forum.
  3. Pars

    KG CFA3 headphone amp

    Not necessarily afraid of them. I've built around 5 of the SS Mini Dynalos, which are pretty much all SMD. The problems with SMD include the difficulty in troubleshooting them, parts removal/changeout (depends on device footprint), problems with matching devices (resistors/transistors), etc. An...
  4. Pars

    kgsshv carbon

    You could also check with Spritzer on his site: https://mjolnir-audio.com/products/
  5. Pars

    "Open Alpha" T50 3D printed headphone project from MrSpeakers

    A friend of mine printed these for me using PLA (and the original files). They look a bit rough on the inside, and considerable clean-up to do on them (started half-assed on one of the cups). I should have used the modified files with the adjustable bass port, etc. Do these look worth the effort...
  6. Pars

    Repairing a Go-Vibe V4 headphone amp (DC jack replacement)

    I'd probably use the 3rd jack you list. The higher current spec just means the jack can handle more current than the other 2 will. Absolutely no effect here, and might last longer. As long as it is physically the same, should work fine.
  7. Pars

    Jade II Tear-Down Rebuttal

    TEAMHifiman: From Shakespeare: "The lady doth protest too much, methinks" Post a schematic (or at least a partial) so that people can actually evaluate the claims. Or stop posting about it. Your posts provide no substantive rebuttal, and those who know electrostats and amp topologies and have...
  8. Pars

    Headphone cable didn't have 4 cores like I thought...safe to use a common ground with a replacement 2.5mm balanced TRRS plug?

    Absolutely not (sorry). For a balanced amp, these are not grounds but amplified minus signals, 180 degrees out of phase with the positive signals for each channel. The amp would not take kindly to having these shorted together. 4 wires is a must.
  9. Pars

    Advice Wanted: Audio Alchemy DAC Damaged?

    I would probably check both D13 and D14. As for U6, you should see if you can read any part numbers on them as whatever they are, they are probably available thru Mouser, etc.
  10. Pars

    Is there a better opamp than the OPA627 ?

    The AD8610 is the single version of this opamp.
  11. Pars

    Is there a better opamp than the OPA627 ?

    I guess that is reasonable for a necro-thread. You did use the dual to single adapter for the AD8620 didn't you? It is a dual opamp and the amp appears to be setup for a single? Dual and single don't have the same pinout.
  12. Pars

    Help me troubleshoot Dac/Amp problem!

    Take a hair dryer or heatgun to it when it is occurring. Then try freeze spray or canned air. ALO? Good luck...
  13. Pars

    need help with wiring a 2.5mm connector

    You can't do stereo balanced with a TRS (the L and R - signals cannot be connected together). I presume the 2.5mm are for the headphone ends? If so, you would only be using one + and one - to each (L and R channels). The + goes to the tip (T), and the - goes to the sleeve (S). If this is for the...
  14. Pars

    Help me troubleshoot Dac/Amp problem!

    My first guess, barring Win10 driver issues, would be bad solder joint(s), given that it only happens once it heats up. If you have some canned air or freeze spray, and can operate it with the cover off, you could spray that around and see if it changes things to narrow down where it might be...
  15. Pars

    Diy cable adaptor help

    Have a Harbor Freight near you? Or most hardware stores should have a cheap multimeter. For a 3 pole jack, there won't be "pairs"; there will be a left (tip of plug), right (ring of plug) and 2 "grounds" (sleeve of plug). The left wire will become the L+, the right wire the R+. The other 2 it...
  16. Pars

    MrSpeakers Aeon Flow Closed Headphone Loaner Program

    MrSpeakers Aeon Flow Thanks as well to Todd for providing the loaners as this was one phone I really wanted to hear, and preferably with my own equipment. As a bit of background on myself: even though I am an older user, my hearing remains pretty good (good enough to detect a 0.5dB channel...
  17. Pars

    Looking for DIY Balanced Amp for LCD2.2 (Orthodynamic Headphones)

    Gilmore current feedback amp (CFP2). You'll probably also want a ubal-bal board to front end this (and do unbalanced to balanced conversion for single-ended sources). I'd use JFET input, but YMMV. Check the "Now for something completely different" thread.
  18. Pars

    Can't Desolder Amp Component.

    You're probably dealing with lead-free solder, which takes more heat to melt. Did you try adding a bit of solder and seeing if you can get it to melt? Not sure what you bought for an iron. The Hakko Dash used to be the recommended cheap soldering iron, but they seem to have discontinued it...
  19. Pars

    stepped potentiometer

    No. The resistance or impedance of the attenuator has no effect on the volume range. Think of a pot or attenuator as a voltage divider. The wiper or step position varies as you turn the knob, giving you more or less voltage ratio from the pot. The resistance for a pot or attenuator is chosen to...
  20. Pars

    Simple Help Need for Power LED indicator on Sigma 22

    What power switch are you using? It looks like there is another pair of wires coming from the switch that are disconnected (visible in the pic with the IEC connector. What voltage is the sigma22 set for? And what voltage can the LED take? If sufficient (LED V), you could just connect it to one...
  21. Pars

    Fixing headphone cable

    I don't use 3.5mm connectors much at all anymore, but when I did, I usually just used Neutrik NYS231s. I'm sure there are many FOTM connectors here (at least there were when I hung out here much), but I haven't kept up on them. https://www.parts-express.com/cat/35-mm-mini-connectors/1504 A stand...
  22. Pars

    Fixing headphone cable

    I assume you are talking about the 3.5mm plug and not the 1/4" adapter? Mangled plugs are no good and normally aren't worth the trouble of trying to save. Do you have a meter (DVM, DMM, etc.)? Soldering iron? Do you know how to solder? If these were mine, I would cut the plug leaving some wire...
  23. Pars

    PCB 9 PIN SOCKET REPAIR. HELP PLZ!

    Additionally, I much prefer a good solder sucker to braid. I hardly use braid anymore.  
  24. Pars

    Fostex T50RP Incremental Mods and Measurements

    I haven't been paying attention to this thread for quite some time; looks like a lot of posts since I have :)   What is considered to be the best mod package these days for a pair of T50RP MkII? I have 2 modded pairs (both done by my brother), and wanted to update one of these. Is DBV #3 still...
  25. Pars

    Is anyone building the KGSSHV?

    I've never seen them in the US. Percy Audio, Partsconnexion both handle TKD, but stereo only. A german vendor does have the quads:   http://www.thel-audioworld.de/bauteile/regler/Potis.htm   I'd agree that these are better than RK27s, but not as good as an RK50 (but then they don't cost...
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