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Darkvoice 336i & 336SE Tuberolling PartII

Discussion in 'Headphone Amps (full-size)' started by heatfan12, Jul 31, 2008.
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  1. sennfan83261
    I purchased mine from Massdrop a few months ago and the internals are pretty much the same as those seen in the old Fitz mod posts, which helped me when I did the same mod on mine.
    Last edited: Jun 23, 2019
    DarkDrummer likes this.
  2. Keno18
    Thanks, I was hoping that was the case. Easier to maintain when it starts aging out.
  3. JKDJedi
    And just got up and did a quick look, just from peeping in the side vents it seems to be what Sennfan83261 is saying, not bad for the price! :wink:
  4. sennfan83261
    Here is a photo I took before modding the amp:


    Last edited: Jun 24, 2019
    JKDJedi and DarkDrummer like this.
  5. Keno18
    Very nice, did not expect to see such care at this price point. I'm a happy camper with this purchase.
  6. Spareribs
    The inside is beautiful looking. I generally prefer no circuit boards if possible
    JKDJedi likes this.
  7. Keno18
    Ordered a Tung-Sol 7236 this afternoon. Can't wait (but have to).:triportsad:
    JKDJedi likes this.
  8. DarkDrummer
    I hate you!!! lol
  9. Keno18
    So does my wife, only she's not laughing.
    DarkDrummer likes this.
  10. JKDJedi
    You won't regret it, great tube, gets better with burn in, and I mean better. :)
  11. diforce
    The hum on the left channel with the red base Tung Sol preamp tube didn't disappear on my amp :L3000: had to be more than 100 hours by now... anyway
    Are the double straight black solid core wires that go into the tube sockets are the heater wires ? (Post #2149)
    I was told i should replace them with braided solid core wire this will remove the hum instead of the 220uF capacitors.
  12. JKDJedi
    Or get a nice NOS tube. Easiest fix.
    Slade01 likes this.
  13. sennfan83261
    NOS tubes generally buzz and, if so, require >24hrs of burn-in. I have quite a few NOS tubes that fit that description and I'm too impatient to wait two days or so to further age my tubes before I can start listening to the amp with them seated. Then again, I have to mod my amp again if I want to enjoy my 6C8G's because of the gain introduced by the 220uF caps.

    Or you can cut the "A/C heater connection to the left channel earth" and create a "virtual zero point" to the chassis earth (Posts #1790 and #1793).
    Last edited: Jun 25, 2019
  14. ecapsretliab
    My NOS tubes are still humming after about 60 hours. I was about to attempt the fitz mod, but I'd rather give this ago instead. I just can't quite make out the "virtual zero point" wiring. Is there a more detailed description on how to do that?
  15. JKDJedi
    I've had the opposite with NOS tubes with just one of them with a very low hum ($8 tube) and the rest just steller, maybe I've been lucky? And if I had the knowledge I'd be all over that Mod the same, I can see how it can help low impedance cans sound better.
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