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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. laurianmoga
    After reading the articles sennfan83261 wrote about, I gently tapped the power tube and the popping/cracking sound disappeared. Surely enough, it came back after a few minutes, but tapping the tube again temporarily fixed the problem. And then again. So, I might be getting somewhere after all. The power tube seems to be bad. (Or the socket?) I'll replace that 6AS7 and see what happens...
    DarkDrummer and JKDJedi like this.
  2. Shroomalistic
    sounds like the power tube is bad. My gray top rca 6s7g is doing the same thing. started hissing a little and when i tap it the his went away for a while. Sad it was my favorite driver thus far. back to my chrome top sylvania.
    JKDJedi likes this.
  3. sennfan83261
    Huh, I thought Darkvoice was only compatible with dual/twin power triodes (e.g. 6AS7, 6080, 7236, and 5998/421A) and dual/twin triodes (6SN7) rather than the pentode 6S7G (see also https://www.head-fi.org/threads/darkvoice-336i-336se-tuberolling-partii.348833/page-4#post-5198985).
  4. Shroomalistic
    Sorry typo, 6s7n not g
  5. JKDJedi
    So guess what... I turned on my Darkvoice this evening and BUZZZZZZZ!!!!!! What Da HEck! And yes replacing the Power tube remedied it. However, 5 minutes later I put the effected power tube back on and the electrical buzz is gone... o.O Hoping it's just dirty contacts. Anyone here know how to clean them?
    Edit: found this guy on google--- >
    CAIG Laboratories DeoxIT SHIELD Liquid, brush applicator 100% solution 7.4 mL
    Last edited: May 30, 2019
    DarkDrummer and sennfan83261 like this.
  6. Xibipiio
    Whatever you do, don’t use a cleaner that might leave a residue of your tubes. The residue can seep down into your tube sockets and wreak havoc. Maybe try a dry, clean toothbrush first, maybe with a little isopropyl alcohol. If that doesn’t work, there are zero-residue context cleaners you can try.
    DarkDrummer and JKDJedi like this.
  7. JKDJedi
    Thanks, I'll give that a try, and have read that Detoxit might be ok to use... thoughts?
  8. Xibipiio
    I don’t have any personal experience with the Caig product. You might give this a try.
  9. Xibipiio
    Oh, and you can clean the sockets themselves by using a pipe cleaner or toothpick with just a little contact cleaner. Be very careful and poke it into the holes to clean them. I love my DV, but you never know if it’s going to act up on any given day! I’ve had noise one day, none the next, with no changes at all
  10. JKDJedi
    Is this overkill for the Darkness?
  11. ggillies
    Take a financial hit for the team, and find out for us, ok? :ksc75smile:
    DarkDrummer likes this.
  12. JKDJedi
    LMAO I'd be Dead Man Walking... :D
    Last edited: May 30, 2019
    ggillies likes this.
  13. DarkDrummer
    You’re forgetting the PSVane CV181-TII.....
  14. JKDJedi
    Those good in the bass department? Wondering if I should just get a bass heavy can.
  15. sennfan83261
    Wow, my Darkvoice is ultra quiet following the Fitz Mod. Noisy 6SN7's no more. Gain is increased though. Before, I typically listened at 9 o'clock but now the volume dial is at almost half past 8 o'clock.

    EDIT: Below 8 o'clock one will encounter channel imbalance, so I had to lower the volume output of my modi 3 to be comfortably between half past 8 o'clock and 9 o'clock. And that's the trade off with the Fitz mod using 220uF caps. With 100uF caps, I read in the Fitz mod thread that one will experience bass roll-off when using those caps.

    EDIT 2: Not really liking being so close to the channel imbalance threshold. Lowering my dac's volume helps a bit, but the volume is still too high. So, I have to lower the overall gain digitally (-10 dB) using Musicbee's EQ. That should be okay for now, as replacing the crappy linear 250K volume pot is likely going to be my next mod for this unit.

    Just reposting the Fitz mod here:

    2x 220uF caps in parallel




    Last edited: Jun 6, 2019
    DarkDrummer and JKDJedi like this.
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